Weather Underground National Weather Summary

Weather Underground National Forecast for Sunday, August 31, 2014

By: nationalsummary, 10:13 PM GMT on August 30, 2014

Weather Underground Forecast for Sunday, August 31, 2014

A cold front will extend from the Great Basin to the northern Plains on Sunday, while a separate cold front will stretch from the upper Mississippi Valley to the central Great Lakes.

A strong area of low pressure will move across the northern Plains on Sunday. A cold frontal boundary associated with this system will extend over the northern and central Plains, the central Rockies and the Great Basin. As warm, humid air streams northward from the Gulf of Mexico, it will collide with this frontal boundary to initiate strong to severe thunderstorms over the nation’s midsection. Severe thunderstorms will be possible over Kansas, Nebraska, northwest Missouri, Iowa, eastern South Dakota, Minnesota and northwest Wisconsin. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. Additionally, scattered showers will trail this system and linger over parts of the Pacific Northwest and the Intermountain West. High pressure will keep conditions mostly clear across the Southwest on Sunday. Temperatures are forecast to exceed 100 degrees across the region.

Meanwhile, an abundance of moisture will spread across the eastern third of the country, triggering rain and thunderstorms over the Gulf Coast, the Southeast, the Tennessee Valley, the Ohio Valley, the Mid-Atlantic and the Northeast. Temperatures are forecast to range between the 80s and 90s across the East Coast.

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Weather Underground National Forecast for Saturday, August 30, 2014

By: nationalsummary, 10:13 PM GMT on August 29, 2014

Weather Underground Forecast for Saturday, August 30, 2014

A low pressure system will move across the upper Mississippi Valley on Saturday, while a separate low pressure system will dip southward over southern Canada.

An area of low pressure will dip southward over south central Canada and the upper Intermountain West on Saturday. As warm, humid air interacts with this system, strong to severe thunderstorms will develop over the north central portion of the country. Severe thunderstorms will be possible over northeast Montana, northwest South Dakota and western North Dakota. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. Scattered thunderstorms will also be possible over the northern and central Rockies. An onshore flow from the Pacific will bring a chance of showers to the Pacific Northwest, while high pressure will keep the remainder of the West Coast clear of precipitation.

Meanwhile, a strong low pressure system will drift northeastward over the upper Mississippi Valley and the western Great Lakes on Saturday. Widespread rain and thunderstorms are expected over the middle and upper Mississippi Valley, as well as the upper Midwest and the Tennessee Valley. To the south, a tropical disturbance over the western Gulf of Mexico will bring heavy rain and thunderstorms to the western and central Gulf Coast. Isolated thunderstorms are also forecast to develop over Florida and the southern Mid-Atlantic. The Northeast will stay mostly clear of wet weather.

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Weather Underground National Forecast for Friday, August 29, 2014

By: nationalsummary, 10:13 PM GMT on August 28, 2014

Weather Underground Forecast for Friday, August 29, 2014

An area of low pressure will move across the upper Mississippi Valley on Friday, while a tropical disturbance will linger over the Gulf of Mexico.

A strong low pressure system is forecast to shift northeastward over the upper Mississippi Valley on Friday. As this system interacts with warm, humid air across the nation’s midsection, strong thunderstorms will develop over the upper Midwest. These thunderstorms will bring heavy rain to several states, which could lead to flash flooding over northeast Iowa, southeast Minnesota, Wisconsin and northwest Michigan. A cold frontal boundary associated with this system will extend southward across the central and southern Plains. Showers and thunderstorms are also expected to develop along this frontal boundary. Meanwhile, a tropical disturbance over the northwestern corner of the Gulf of Mexico will push stormy weather across the western and central portions of the Gulf Coast, while sea breeze induced thunderstorms are expected over Florida. Just to the north, scattered showers will be possible over the Mid-Atlantic. High pressure will keep conditions clear across the Northeast.

Daytime heating and monsoonal moisture will trigger isolated thunderstorms over the central and northern Rockies during Friday afternoon and evening. Additionally, a cold front will begin to move across the Northwest, bringing a chance of rain to Oregon and Washington. A ridge of high pressure over the eastern Pacific will keep the remainder of the West Coast mostly clear of precipitation.

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Weather Underground National Forecast for Thursday, August 28, 2014

By: nationalsummary, 10:13 PM GMT on August 27, 2014

Weather Underground Forecast for Thursday, August 28, 2014

A low pressure system will move across the central Plains on Thursday, while a cold front will extend from the middle Mississippi Valley to the Mid-Atlantic.

A strong low pressure system will continue to move east northeastward over the central Plains on Thursday. This system will interact with a warm, muggy air mass to initiate strong thunderstorms across the nation\'s midsection. Heavy rain associated with these thunderstorms will bring a chance of flash flooding to Iowa, southeast Minnesota, northern Illinois and southern Wisconsin. Isolated showers and thunderstorms will trail this system and linger over the Intermountain West and the Four Corners. Conditions will stay mostly clear across the West Coast due to high pressure over the Great Basin. The exception to this will be over the Northwest, where an onshore flow will usher showers across northwest Washington.

Meanwhile, an area of low pressure will drift northeastward over southeast Canada. This system will bring rainy weather to northern New England on Thursday. A cold front associated with this system will extend southwestward over the Mid-Atlantic, the Tennessee Valley and the middle Mississippi Valley. Scattered showers and thunderstorms will be possible along this frontal boundary. Additionally, a tropical disturbance over the northwestern corner of the Gulf of Mexico will bring rain and thunderstorms to coastal Texas and parts of Louisiana. Sea breeze induced thunderstorms will also pop up over Florida on Thursday.

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Weather Underground National Forecast for Wednesday, August 27, 2014

By: nationalsummary, 10:13 PM GMT on August 26, 2014

Weather Underground Forecast for Wednesday, August 27, 2014

A broad area of low pressure will affect the western half of the country on Wednesday, while a cold frontal boundary will extend from the middle Mississippi Valley to the Northeast.

A strong low pressure system will move slowly eastward over the Intermountain West on Wednesday. As an abundance of monsoonal moisture streams northward over the Four Corners, it will interact with this low pressure system to initiate strong thunderstorms across the nation’s midsection. Thunderstorms will be possible across the Great Basin, the central and southern Rockies, and the central and southern Plains. These thunderstorms will bring heavy rain to the region, which could lead to flash flooding over northeast Colorado, southeast Wyoming, northern Kansas, Nebraska, southeast South Dakota and Iowa. Conditions will remain mostly clear across the West Coast due to a ridge of high pressure over the eastern Pacific.

Meanwhile, a cold front will extend across the middle Mississippi Valley, the Ohio Valley and the Northeast on Wednesday. Scattered showers and thunderstorms will be possible along this frontal boundary, although storms will stay relatively weak throughout the day. Warm, muggy air will continue to push northward from the Gulf of Mexico, as temperatures are forecast to range between the 90 and 100s over the middle Mississippi Valley. A disturbance along the northern Gulf of Mexico will generate rain and thunderstorms across the Gulf Coast, while the Mid-Atlantic and majority of the Southeast will avoid wet weather.

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Weather Underground National Forecast for Tuesday, August 26, 2014

By: nationalsummary, 10:13 PM GMT on August 25, 2014

Weather Underground Forecast for Tuesday, August 26, 2014

A cold front will extend from the central Plains to the central Great Lakes on Tuesday, while a low pressure system will develop over the Great Basin.

An area of low pressure will move north northeastward over the Great Basin on Tuesday. This system will interact with monsoonal moisture over the region, which will initiate widespread thunderstorms over the Great Basin, the Desert Southwest and the Rockies. Heavy rain associated with these thunderstorms will bring a chance of flash flooding to Arizona, southwest Utah and southeast Nevada. A ridge of high pressure will remain parked over the eastern Pacific, keeping conditions mostly clear across the West Coast.

Meanwhile, a separate area of low pressure will continue to drift northeastward over central and eastern Canada. A cold frontal boundary associated with this system will extend southwestward over the central Great Lakes, the upper Midwest and the central Plains. An abundance of moisture will move northward from the Gulf of Mexico, which will collide with this frontal boundary to trigger numerous areas of thunderstorms. The strongest thunderstorms will focus over the nation’s midsection. Flash flooding will be possible over northeast Colorado, northwest Kansas, Nebraska and Iowa. Scattered showers and thunderstorms will also develop over parts of the Tennessee Valley and the Ohio Valley. The majority of the Southeast will avoid wet weather on Tuesday, although sea breeze induced thunderstorms are expected across Florida.

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Weather Underground National Forecast for Monday, August 25, 2014

By: nationalsummary, 10:13 PM GMT on August 24, 2014

Weather Underground Forecast for Monday, August 25, 2014

An area of low pressure will drift across the northern tier of the country on Monday, while monsoonal thunderstorms will develop over the Four Corners.

A strong low pressure system will move east northeastward over the upper Midwest and south central Canada on Monday. This system will bring rainy weather to the upper Mississippi Valley and the western Great Lakes. A cold frontal boundary associated with this system will extend southwestward over the northern and central Plains. As warm, muggy air interacts with this cold front, strong thunderstorms will develop over the nation’s midsection. Heavy rain associated with these thunderstorms will bring a chance of flash flooding to northeast Colorado, Nebraska, southeast South Dakota and western Iowa. Meanwhile, a surge of monsoonal moisture will spread across the Four Corners and the southern Rockies. This moisture will aid in producing afternoon and evening thunderstorms over the southern Rockies and parts of the Great Basin. The West Coast will stay mostly clear of precipitation on Monday due to a ridge of high pressure over the eastern Pacific.

A weakening cold front will stretch across the lower Mississippi Valley, the Deep South and the Southeast. An onshore flow from the Gulf of Mexico will collide with this frontal boundary, triggering thunderstorms across parts of the Gulf Coast and the Southeast. High pressure will keep the Northeast mostly clear on Monday.

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Weather Underground National Forecast for Sunday, August 24, 2014

By: nationalsummary, 10:13 PM GMT on August 23, 2014

Weather Underground Forecast for Sunday, August 24, 2014

A strong low pressure system will move across the northern tier of the country on Sunday, while a cold front will extend from the middle Mississippi Valley to the Southeast.

A strong area of low pressure will lift northeastward over the north central portion of the country on Sunday. As this system interacts with warm, muggy air over the nation’s midsection, strong to severe thunderstorms will develop over the northern Plains and the upper Mississippi Valley. Severe thunderstorms will be possible over northern Minnesota and northwest Wisconsin. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. Additionally, heavy rain associated with this system will bring a chance of flash flooding to northeast Montana and northwest North Dakota. Isolated thunderstorms will also linger over parts of the Pacific Northwest and the upper Intermountain West. Temperatures are forecast to drop 10 to 20 degrees below normal from the upper Intermountain West to the upper Mississippi Valley on Sunday.

Just to the south, monsoonal moisture will trigger afternoon and evening thunderstorms across the central and southern Rockies and parts of the Great Basin. The West Coast will stay mostly clear of wet weather due to a ridge of high pressure over the eastern Pacific.

A cold front extending from the middle Mississippi Valley to the Southeast will collide with a warm, humid air mass from the Gulf of Mexico. Rain and thunderstorms will develop over the southern Ohio Valley, the Tennessee Valley, the Southeast and the eastern Gulf Coast. The northern Mid-Atlantic and the Northeast will avoid wet weather.

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Weather Underground National Forecast for Saturday, August 23, 2014

By: nationalsummary, 10:13 PM GMT on August 22, 2014

Weather Underground Forecast for Saturday, August 23, 2014

An area of low pressure will move across the northern tier of the country on Saturday, while a cold front will extend from the central Plains to the Mid-Atlantic.

A strong low pressure system will trek eastward over the upper Intermountain West and the northern Plains. As this system interacts with warm, muggy air over the nation’s midsection, strong to severe thunderstorms will develop from the upper Intermountain West to the upper Mississippi Valley. Severe thunderstorms will be possible over southeast North Dakota, northeast South Dakota and western Minnesota. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. In addition, heavy rain associated with these thunderstorms will bring a chance of flash flooding to eastern South Dakota and southwest Minnesota. Heavy rain will also bring a threat of flash flooding to northeast Idaho and Montana. Just to the south, monsoonal thunderstorms will be possible over the central and southern Rockies, as well as the central high Plains. The West Coast will stay clear of wet weather due to a ridge of high pressure over the eastern Pacific.

Meanwhile, a cold front will extend across the central Plains, the Ohio Valley, the Tennessee Valley and the Mid-Atlantic. Rain and thunderstorms will develop along this frontal boundary over a handful of states. The strongest storms will focus over the southern Ohio Valley, the Tennessee Valley and the Mid-Atlantic. Rainy weather will also be possible over parts of New England. An onshore flow from the Gulf of Mexico will trigger isolated thunderstorms over the eastern Gulf Coast and the Southeast, while the western Gulf Coast and the southern Plains will stay clear of precipitation.

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Weather Underground National Forecast for Friday, August 22, 2014

By: nationalsummary, 10:13 PM GMT on August 21, 2014

Weather Underground Forecast for Friday, August 22, 2014

A cold front will extend across the upper Intermountain West and the northern Plains on Friday, while a separate frontal boundary will stretch from the upper Midwest to the Mid-Atlantic.

A cold front will dip southward over the Intermountain West and the northern Plains. As this frontal boundary interacts with monsoonal moisture, showers and thunderstorms will develop over the upper Intermountain West, the northern Plains and the central Plains. Heavy rain associated with these thunderstorms will bring a chance of flash flooding to Montana. Just to the south, scattered showers and thunderstorms will develop over the Four Corners as monsoonal moisture surges across the region. The majority of the West Coast will stay clear of wet weather due to a ridge of high pressure over the eastern Pacific.

A separate frontal boundary will extend across the upper Midwest, the Ohio Valley, the central Appalachians and the northern Mid-Atlantic. Warm, muggy air from the Gulf of Mexico will collide with this frontal boundary to initiate heavy rain and thunderstorms over the region. Heavy rain could lead to flash flooding over eastern Kentucky, eastern Ohio, West Virginia, southwest Pennsylvania, western Maryland and western Virginia. Rainy weather will also develop over the Northeast.

Meanwhile, an onshore flow from the Gulf of Mexico will continue to trigger isolated thunderstorms across the Gulf Coast and the Southeast. The Deep South and the middle Mississippi Valley will stay mostly clear on Friday.

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Weather Underground National Forecast for Thursday, August 21, 2014

By: nationalsummary, 10:13 PM GMT on August 20, 2014

Weather Underground Forecast for Thursday, August 21, 2014

An area of low pressure will begin to weaken over the eastern third of the country on Thursday, while a cold front will extend across the northern tier of the country.

A cold front is forecast to extend across the upper Intermountain West and the northern Plains on Thursday. As this system interacts with warm, muggy air over the region, strong thunderstorms will develop across several states. Heavy rain associated with these thunderstorms will bring a chance of flash flooding to northeast Montana, western North Dakota and northwest South Dakota. Rain and thunderstorms will also develop over the upper Mississippi Valley and the eastern Great Lakes. Just to the south, an abundance of monsoonal moisture will initiate isolated showers and thunderstorms across the Intermountain West and the Desert Southwest. A ridge of high pressure over the eastern Pacific will keep conditions mostly clear across the West Coast.

Meanwhile, a low pressure system will move eastward over the southern Great Lakes, the Ohio Valley and the central Appalachians. This system will usher heavy rain and thunderstorms across the upper Midwest, the Ohio Valley, the Tennessee Valley, the Mid-Atlantic and southern New England. There will be a threat of flash flooding over several states, including southern Michigan, northeast Indiana, Ohio, West Virginia and southwest Pennsylvania. An onshore flow from the Gulf of Mexico will trigger thunderstorm activity over the Gulf Coast and the Southeast on Thursday. .

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Weather Underground National Forecast for Wednesday, August 20, 2014

By: nationalsummary, 10:13 PM GMT on August 19, 2014

Weather Underground Forecast for Wednesday, August 20, 2014

An area of low pressure will move across the Great Lakes on Wednesday, while a separate low pressure system will dip southward over the northern Plains.

A low pressure system will begin to dip south southeastward over the northern Plains on Wednesday. As this system interacts with warm, muggy air draped across the nation’s midsection, strong to severe thunderstorms will develop over the northern tier of the country. Severe thunderstorms will be possible over South Dakota, northern Nebraska, northwest Iowa and southwest Minnesota. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. In addition, heavy rain associated with these thunderstorms will bring a threat of flash flooding to southeast North Dakota, eastern South Dakota and southeast Minnesota. Scattered showers and thunderstorms will also be possible over the central Plains.

Meanwhile, a separate area of low pressure will trek eastward over the Great Lakes. This system will usher numerous area of thunderstorms over the Great Lakes, the Ohio Valley, the Tennessee Valley and the Mid-Atlantic. An onshore flow from the Gulf of Mexico will trigger thunderstorm activity across the Gulf Coast and the Southeast. High pressure will keep conditions clear across the Northeast.

Out west, monsoonal moisture will surge across the Intermountain West and the Desert Southwest. Isolated showers and thunderstorms will be possible across a handful of states, while the West Coast will avoid wet weather on Wednesday.

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Weather Underground National Forecast for Tuesday, August 19, 2014

By: nationalsummary, 10:12 PM GMT on August 18, 2014

Weather Underground Forecast for Tuesday, August 19, 2014

An area of low pressure will push across the upper Midwest on Tuesday, while a separate low pressure system will inch across the Mid-Atlantic.

A low pressure system will move east southeastward over the upper Mississippi Valley, the western Great Lakes and the upper Midwest. As this system interacts with warm, muggy air over the nation’s midsection, heavy rain and thunderstorms will develop across the upper Mississippi Valley, the Ohio Valley and the Great Lakes. Additionally, a cold front associated with this system will extend south southwestward. Thunderstorms will also develop along this frontal boundary over the middle Mississippi Valley and the Tennessee Valley.

Just to the east, a separate low pressure system will drift slowly eastward over the Mid-Atlantic. Heavy rain will be possible over the coasts of Virginia and the Carolinas, while scattered showers and thunderstorms will develop across the southern Mid-Atlantic and the Southeast. The northern Mid-Atlantic and New England will stay mostly clear of wet weather.

Out west, monsoonal thunderstorms will develop across the Four Corners and the Desert Southwest during Tuesday afternoon and evening. Heavy rain associated with these thunderstorms will bring a chance of flash flooding to western New Mexico and much of Arizona. A weak area of low pressure along the West Coast will usher scattered showers and isolated thunderstorms over parts of the Pacific Northwest and northern California.

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Weather Underground National Forecast for Monday, August 18, 2014

By: nationalsummary, 10:12 PM GMT on August 17, 2014

Weather Underground Forecast for Monday, August 18, 2014

A cold front will extend from the middle Mississippi Valley to the Mid-Atlantic on Monday, while an area of low pressure will move across the northern Plains.

A low pressure system will inch eastward over the northern Plains. As this system interacts with a warm, muggy air draped across the nation’s midsection, strong to severe thunderstorms will develop across the northern tier of the country. Severe thunderstorms will be possible over parts of southeast South Dakota, eastern Nebraska and western Iowa. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. Scattered showers and thunderstorms will also move across North Dakota, Minnesota and Wisconsin.

Just to the southwest, monsoonal moisture will trigger afternoon and evening thunderstorms across parts of the central and southern Rockies, as well as the Desert Southwest. High pressure over the eastern Pacific will keep conditions mostly clear across the West Coast on Monday.

Meanwhile, a cold front will extend across the middle Mississippi Valley, the Tennessee Valley and the Mid-Atlantic. Widespread rain and thunderstorms will develop along this frontal boundary, while an onshore flow from the Gulf of Mexico will bring isolated thunderstorms to the Gulf Coast and the Southeast. An area of low pressure will continue to drift northeastward over southeast Canada. This system will usher showers across northern New England on Monday.

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Weather Underground National Forecast for Sunday, August 17, 2014

By: nationalsummary, 10:12 PM GMT on August 16, 2014

Weather Underground Forecast for Sunday, August 17, 2014

A cold front will extend from the northern Plains to the Northeast on Sunday, while a separate frontal boundary will stretch from the southern Plains to the Tennessee Valley.

A cold frontal boundary will extend across the northern Plains, the upper Mississippi Valley, the Great Lakes and the Northeast. Showers will develop ahead of this frontal boundary over the Great Lakes, the upper Midwest and parts of the Northeast. Just to the south, a separate frontal boundary will stretch across the southern Plains, the middle Mississippi Valley and the Tennessee Valley. As this frontal boundary collides with warm, muggy air from the Gulf of Mexico, numerous clusters of thunderstorms will develop over the region. Heavy rain along the eastern end of the cold front will bring a chance of flash flooding to southeast Illinois, southern Indiana, southwest Ohio, Kentucky and northern Tennessee. An onshore flow from the Gulf of Mexico will also trigger thunderstorm activity across the Deep South and the central Gulf Coast.

Meanwhile, a surge of monsoonal moisture will bring a chance of showers and thunderstorms to the northern and central Plains, the southern Rockies and the Southwest. Heavy rain associated with these thunderstorms will bring a threat of flash flooding to northern Nebraska and South Dakota. High pressure over the eastern Pacific will keep the majority of the West Coast mostly clear of precipitation.

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Weather Underground National Forecast for Saturday, August 16, 2014

By: nationalsummary, 10:12 PM GMT on August 15, 2014

Weather Underground Forecast for Saturday, August 16, 2014

A cold front will extend across the northern tier of the country on Saturday, while a low pressure system will move over the central Plains.

An area of low pressure will deepen over the central Plains on Saturday. As this system interacts with an abundance of moisture from the Gulf of Mexico, strong to severe thunderstorms will develop over the nation’s midsection. Severe thunderstorms will be possible over eastern Kansas, Missouri and southern Iowa. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. Heavy rain associated with these thunderstorms will also bring a chance of flash flooding to the middle Mississippi Valley. In addition, scattered showers and thunderstorms will be possible over the southern Plains.

Meanwhile, a cold front will extend across the northern Plains, the upper Mississippi Valley and the western Great Lakes. This system will generate thunderstorms across the northern tier of the country as it collides with a warm, muggy air mass. An area of low pressure along the eastern end of the frontal boundary will usher showers and thunderstorms over parts of the Ohio Valley and the Northeast. Scattered showers will also trail this system over the Pacific Northwest and the upper Intermountain West. The Desert Southwest will stay mostly clear of precipitation on Saturday.

An area of low pressure will linger over the Mid-Atlantic, which will trigger thunderstorm activity across portions of the eastern Gulf Coast, the Southeast and the southern Mid-Atlantic.

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Weather Underground National Forecast for Friday, August 15, 2014

By: nationalsummary, 10:12 PM GMT on August 14, 2014

Weather Underground Forecast for Friday, August 15, 2014

A cold front will dip southward over the northern tier of the country on Friday, while rainy weather wind down over the Northeast.

A cold front will begin to move south southeastward over the northern Plains and the upper Mississippi Valley on Friday. As this system interacts with warm, muggy air from the Gulf of Mexico, strong to severe thunderstorms will develop across the north central portion of the country. Heavy rain associated with these thunderstorms will bring a chance of flash flooding to northern Montana, southwest North Dakota and South Dakota. Additionally, isolated thunderstorms will be possible across the central Plains, the middle Mississippi Valley and the upper Mississippi Valley. Just to the south, monsoonal moisture will fuel scattered showers and thunderstorms across the Four Corners. Flash flooding will be possible across valleys adjacent to sloped terrain. Showers and thunderstorms will also linger over the Pacific Northwest and the upper Intermountain West. High pressure will keep the majority of the Desert Southwest mostly clear of precipitation.

Meanwhile, an area of low pressure will continue to drift northeastward over southeast Canada. Showers will will trail this system over parts of the Northeast, while high pressure will keep conditions dry across the Ohio Valley and the Mid-Atlantic. The tail end of a frontal boundary will linger over the Southeast, which will aid in producing rain and thunderstorms over Florida, southern Georgia and the eastern Gulf Coast.

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Weather Underground National Forecast for Thursday, August 14, 2014

By: nationalsummary, 10:12 PM GMT on August 13, 2014

Weather Underground Forecast for Thursday, August 14, 2014

A low pressure system will inch eastward over the Intermountain West and the northern Plains on Thursday, while a separate low pressure system will move across the Northeast.

A strong area of low pressure will move eastward over the upper Intermountain West and the northern Plains. As this system interacts with monsoonal moisture, strong to severe thunderstorms will develop over the northwestern corner of the country. Severe thunderstorms will be possible over eastern Washington, northeast Oregon, Idaho and western Montana. These thunderstorms will be capable of producing large hail and dangerous straight line winds. In addition, heavy rain associated with these thunderstorms will bring a threat of flash flooding to Washington, northern Idaho and northwest Montana. Scattered showers and thunderstorms will also be possible across the Four Corners and the northern Plains due to a surge of monsoonal moisture from the south. Flash flooding will be possible over western Colorado on Thursday.

Meanwhile, a low pressure system will drift across the Northeast. This system will usher heavy rain and thunderstorms over New England, as flash flooding will be possible across northern Maine. A cold front associated with this system will extend several hundred miles east of the East Coast, while the tail end of this cold front will stretch across the Southeast. Warm, muggy air over the Gulf of Mexico will interact with this frontal boundary to trigger thunderstorm activity along the Gulf Coast and the Southeast. A separate cold front will move over the eastern Great Lakes and the Ohio Valley, pushing rainy weather over the region.

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Weather Underground National Forecast for Wednesday, August 13, 2014

By: nationalsummary, 10:12 PM GMT on August 12, 2014

Weather Underground Forecast for Wednesday, August 13, 2014

A cold front will extend from the western Gulf Coast the the northern Mid-Atlantic on Wednesday, while a separate cold front will move across the Northwest.

A low pressure system will move slowly across the northern Mid-Atlantic on Wednesday. This system will carry heavy rain and thunderstorms across the Northeast, which could lead to flash flooding over Connecticut, Massachusetts, Vermont, New Hampshire and southwest Maine. Isolated showers and thunderstorms will also develop over the northern Mid-Atlantic. Additionally, a cold front associated with this low pressure will extend across the Eastern Seaboard and the Gulf Coast. As this cold front interacts with a warm, muggy air mass, thunderstorms will develop across the southern Mid-Atlantic, the Southeast and the Gulf Coast. High pressure will keep conditions clear across the Mississippi Valley, the Tennessee Valley and the western tier of the Ohio Valley.

A separate cold front will stretch from the northern Plains to the western Great Lakes. Rain and thunderstorms are forecast to develop over the northern and central Plains on Wednesday. Just to the southwest, monsoonal moisture will continue to initiate scattered thunderstorms across the Four Corners and parts of the Desert Southwest. These thunderstorms will bring a threat of flash flooding to northwest New Mexico and southwest Colorado.

A strong low pressure system will move eastward over the Pacific Northwest. A cold front associated with this system will extend across Washington, Oregon and northern California. Severe thunderstorms are forecast to develop ahead of this frontal boundary over southeast Washington, northeast Oregon, Idaho and western Montana. These thunderstorms will be capable of producing large hail, dangerous straight line winds and heavy rain.

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Weather Underground National Forecast for Tuesday, August 12, 2014

By: nationalsummary, 10:12 PM GMT on August 11, 2014

Weather Underground Forecast for Tuesday, August 12, 2014

An area of low pressure will sweep across the Great Lakes on Tuesday, while monsoonal thunderstorms will affect the western half of the country.

A strong low pressure system will move east northeastward over the Great Lakes. This system will usher showers and thunderstorms across the upper Midwest, the Great Lakes and parts of the Northeast. Heavy rain is forecast to develop over the northern Mid-Atlantic and southern New England, which could lead to flash flooding over western Massachusetts, western Connecticut, southeast New York, eastern Pennsylvania, New Jersey and parts of Maryland. Additionally, a cold front associated with this system will extend south southwestward. As this cold front collides with warm, muggy air from the Gulf of Mexico, widespread rain and thunderstorms will develop across the Ohio Valley, the Tennessee Valley, the Deep South and the Gulf Coast. A separate low pressure system will linger over the Southeast. Thunderstorms will also accompany this system on Tuesday.

A ridge of high pressure will build over the northern Plains, bringing dry conditions to much of the Plains and the Mississippi Valley. Just to the west, monsoonal moisture will spread across the Intermountain West, the Great Basin and the Southwest. Isolated showers and thunderstorms will be possible across the western half of the country, which will bring a threat of flash flooding to valleys adjacent to sloped terrain. .

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Weather Underground National Forecast for Monday, August 11, 2014

By: nationalsummary, 10:12 PM GMT on August 10, 2014

Weather Underground Forecast for Monday, August 11, 2014

A cold front will extend from the southern Plains to the Southeast on Monday, while a separate cold front will stretch from the central Plains to the western Great Lakes.

A cold front will extend across the southern Plains, the middle Mississippi Valley, the Tennessee Valley and the Southeast. As warm, humid air from the Gulf of Mexico collides with this frontal boundary, rain and thunderstorms will develop across a handful of states. The heaviest rain will focus over the Southeast and the southern Mid-Atlantic as an area of low pressure inches across the region.

Meanwhile, a separate cold front extending from the central Plains to the western Great Lakes will push eastward over the Mississippi Valley. This frontal boundary will override muggy air to trigger thunderstorms across the middle and upper Mississippi Valley, the upper Midwest, the Ohio Valley and the northern MId-Atlantic. Heavy rain associated with these thunderstorms will bring a chance of flash flooding to eastern Ohio, northwest West Virginia and western Pennsylvania.

Monsoonal thunderstorms will make a return to the western half of the country on Monday as a surge of moisture moves northward across the Intermountain West, the Southwest and the Great Basin. Flash flooding will be possible in valleys adjacent to sloped terrain, especially along the Sierra Nevadas and the Rockies. The West Coast will stay mostly clear of wet weather due to high pressure over the eastern Pacific.

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Weather Underground National Forecast for Sunday, August 10, 2014

By: nationalsummary, 10:12 PM GMT on August 09, 2014

Weather Underground Forecast for Sunday, August 10, 2014

A cold front will extend from the middle Mississippi Valley to the Mid-Atlantic on Sunday, while a separate cold front will move across the Plains.

A slow moving frontal boundary will extend across the middle Mississippi Valley, the Tennessee Valley and the southern Mid-Atlantic on Sunday. Warm, muggy air from the Gulf of Mexico will collide with this frontal boundary to initiate showers and thunderstorms across the lower Mississippi Valley, the Gulf Coast, the Ohio Valley, the Tennessee Valley, the Mid-Atlantic and the Southeast. The majority of the northern Mid-Atlantic and the Northeast will stay clear of precipitation due to high pressure over the region. The exception to this will be over northern New England, where scattered showers will linger during the morning.

A separate cold front will extend from the central Plains to the upper Midwest. This frontal boundary will move slowly southeastward, and will bring widespread rain and thunderstorms to the central and northern Plains.

To the west of the Continental Divide, lingering monsoonal moisture will bring a chance of afternoon showers and thunderstorms to parts of the Intermountain West and the Great Basin. The majority of the West Coast will stay warm and dry on Sunday due to a ridge of high pressure draped over the eastern Pacific. Temperatures are forecast to range between the 90s and 100s across the Desert Southwest.

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Weather Underground National Forecast for Saturday, August 09, 2014

By: nationalsummary, 10:12 PM GMT on August 08, 2014

Weather Underground Forecast for Saturday, August 09, 2014

An area of low pressure will move across the Tennessee Valley on Saturday, while a separate low pressure system will inch across the northern Plains.

A low pressure system will trek east southeastward over the Tennessee Valley on Saturday. As this system draws warm, muggy air from the Gulf of Mexico, strong to severe thunderstorms will develop over the Ohio Valley, the Tennessee Valley, the central and eastern Gulf Coast, the Southeast and the Mid-Atlantic. Due to how slow this system is expected to move, flash flood will be possible over several states, including parts of Tennessee, Alabama, Georgia and the Carolinas. Scattered showers will also linger over of the Northeast as an area of low pressure drifts northeastward over southeast Canada.

Meanwhile, a separate low pressure system will inch across the northern Plains on Saturday. This system will interact with warm, humid air draped across the nation’s midsection. Showers and thunderstorms will be possible over the Dakotas, Nebraska, southwest Minnesota, western Iowa and northern Kansas. The heaviest rain will likely affect southeast Nebraska, northern Kansas and southwest Minnesota.

Scattered showers and isolated thunderstorms will also develop over the Intermountain West and the Great Basin as monsoonal moisture lingers over the region. The majority of the West Coast will stay mostly clear of precipitation due to a ridge of high pressure over the eastern Pacific.

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Weather Underground National Forecast for Friday, August 08, 2014

By: nationalsummary, 10:12 PM GMT on August 07, 2014

Weather Underground Forecast for Friday, August 08, 2014

A slow moving cold front will extend from the central Plains to the Mid-Atlantic, while a separate cold front will move across the Northeast.

A cold front will stretch across the central Plains, the middle Mississippi Valley, the Tennessee Valley and the Mid-Atlantic. Warm, muggy air from the Gulf of Mexico will interact with this cold front to initiate widespread rain and thunderstorms over a handful of states. Thunderstorms will be possible across the Southeast, the Gulf Coast, the Deep South, the middle Mississippi Valley, the central Plains and the northern Plains. Heavy rain associated with these thunderstorms will bring a chance of flash flooding to the southern and central Appalachians. Temperatures are forecast to range between the 70s and 80s across the northern tier of the country, as humidity levels will drop below normal. Meanwhile, temperatures are forecast to range between the 90s and 100s from the southern Plains to the Southeast.

A low pressure system will move eastward across the northeastern corner of the country. This system will usher rain and thunderstorms across northern New England on Friday.

Out west, a separate low pressure system will linger over the upper Intermountain West. As this system interacts with a monsoonal moisture, showers and afternoon thunderstorms will develop across the Rockies and the Great Basin. High pressure over the eastern Pacific will keep the West Coast mostly clear of precipitation.

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Weather Underground National Forecast for Thursday, August 07, 2014

By: nationalsummary, 10:12 PM GMT on August 06, 2014

Weather Underground Forecast for Thursday, August 07, 2014

A cold front will extend from the central Plains to the Mid-Atlantic, while a trough of low pressure will continue to inch across the Great Basin and the Intermountain West.

A cold frontal boundary will stretch across the central Plains, the middle Mississippi Valley, the Tennessee Valley and the Mid-Atlantic. As warm, humid air from the Gulf of Mexico interacts with this frontal boundary, numerous areas of showers and thunderstorms will develop over the central and eastern thirds of the country. Strong thunderstorms are expected over the central Plains and the middle Mississippi Valley. Heavy rain associated with these thunderstorms will bring a chance of flash flooding to northeast Colorado, southwest Nebraska, northwest Kansas, southeast Iowa, eastern Missouri, northeast Arkansas, Illinois, southwest Indiana, western Kentucky and western Tennessee. Scattered showers and thunderstorms will also be possible over the Deep South and the Southeast due to an onshore flow from the Gulf of Mexico. An area of low pressure along the coast of New England will bring a chance of rain and thunderstorms to the northeast, while the Mid-Atlantic will stay mostly clear of precipitation.

Meanwhile, a trough of low pressure will continue to inch across the Great Basin and the Intermountain West. Monsoonal moisture will aid in producing showers and thunderstorms over parts of northern California, the Great Basin and the central Rockies. High pressure over the eastern Pacific will keep conditions warm and dry over the Pacific Northwest and the Desert Southwest.

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Weather Underground National Forecast for Wednesday, August 06, 2014

By: nationalsummary, 8:16 AM GMT on August 06, 2014

Weather Underground Forecast for Wednesday, August 06, 2014

A cold front will extend from the Intermountain West to the Northeast, while an area of low pressure will continue to linger over California and Nevada.

A cold front will stretch across the upper Intermountain West, the central Plains, the middle Mississippi Valley, the Ohio Valley, the Mid-Atlantic and the coast of New England. As warm, humid air from the Gulf of Mexico collides with a cooler air mass to the north of the cold front, widespread rain and thunderstorms will develop across the central and eastern thirds of the country. Severe thunderstorms will be possible over southern Iowa, northern Missouri and western Illinois. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. In addition, heavy rain associated with these thunderstorms will bring a chance of flash flooding to southeast South Dakota, northeast Nebraska, Iowa, northern Missouri and northwest Illinois. Scattered showers and thunderstorms will also be possible over the northern Plains, the Ohio Valley, the Tennessee Valley, the Mid-Atlantic and the Northeast. High pressure will keep conditions mostly clear across the southern Plains, while an onshore flow from the Gulf of Mexico will initiate isolate thunderstorms across the Gulf Coast and the the Southeast.

Meanwhile, an area of low pressure will continue to linger over northern California and Nevada. As this system interacts with monsoonal moisture, numerous clusters of thunderstorms will develop across the Intermountain West, the Great Basin and parts of the West Coast. High pressure over the eastern Pacific will keep conditions mostly clear across the Pacific Northwest and the Desert Southwest.

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Weather Underground National Forecast for Wednesday, August 06, 2014

By: nationalsummary, 8:14 AM GMT on August 06, 2014

Weather Underground Forecast for Wednesday, August 06, 2014

A cold front will extend from the Intermountain West to the Northeast, while an area of low pressure will continue to linger over California and Nevada.

A cold front will stretch across the upper Intermountain West, the central Plains, the middle Mississippi Valley, the Ohio Valley, the Mid-Atlantic and the coast of New England. As warm, humid air from the Gulf of Mexico collides with a cooler air mass to the north of the cold front, widespread rain and thunderstorms will develop across the central and eastern thirds of the country. Severe thunderstorms will be possible over southern Iowa, northern Missouri and western Illinois. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. In addition, heavy rain associated with these thunderstorms will bring a chance of flash flooding to southeast South Dakota, northeast Nebraska, Iowa, northern Missouri and northwest Illinois. Scattered showers and thunderstorms will also be possible over the northern Plains, the Ohio Valley, the Tennessee Valley, the Mid-Atlantic and the Northeast. High pressure will keep conditions mostly clear across the southern Plains, while an onshore flow from the Gulf of Mexico will initiate isolate thunderstorms across the Gulf Coast and the the Southeast.

Meanwhile, an area of low pressure will continue to linger over northern California and Nevada. As this system interacts with monsoonal moisture, numerous clusters of thunderstorms will develop across the Intermountain West, the Great Basin and parts of the West Coast. High pressure over the eastern Pacific will keep conditions mostly clear across the Pacific Northwest and the Desert Southwest.

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Weather Underground National Forecast for Wednesday, August 06, 2014

By: nationalsummary, 8:12 AM GMT on August 06, 2014

Weather Underground Forecast for Wednesday, August 06, 2014

A cold front will extend from the Intermountain West to the Northeast, while an area of low pressure will continue to linger over California and Nevada.

A cold front will stretch across the upper Intermountain West, the central Plains, the middle Mississippi Valley, the Ohio Valley, the Mid-Atlantic and the coast of New England. As warm, humid air from the Gulf of Mexico collides with a cooler air mass to the north of the cold front, widespread rain and thunderstorms will develop across the central and eastern thirds of the country. Severe thunderstorms will be possible over southern Iowa, northern Missouri and western Illinois. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. In addition, heavy rain associated with these thunderstorms will bring a chance of flash flooding to southeast South Dakota, northeast Nebraska, Iowa, northern Missouri and northwest Illinois. Scattered showers and thunderstorms will also be possible over the northern Plains, the Ohio Valley, the Tennessee Valley, the Mid-Atlantic and the Northeast. High pressure will keep conditions mostly clear across the southern Plains, while an onshore flow from the Gulf of Mexico will initiate isolate thunderstorms across the Gulf Coast and the the Southeast.

Meanwhile, an area of low pressure will continue to linger over northern California and Nevada. As this system interacts with monsoonal moisture, numerous clusters of thunderstorms will develop across the Intermountain West, the Great Basin and parts of the West Coast. High pressure over the eastern Pacific will keep conditions mostly clear across the Pacific Northwest and the Desert Southwest.

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Weather Underground National Forecast for Wednesday, August 06, 2014

By: nationalsummary, 8:08 AM GMT on August 06, 2014

Weather Underground Forecast for Wednesday, August 06, 2014

A cold front will extend from the Intermountain West to the Northeast, while an area of low pressure will continue to linger over California and Nevada.

A cold front will stretch across the upper Intermountain West, the central Plains, the middle Mississippi Valley, the Ohio Valley, the Mid-Atlantic and the coast of New England. As warm, humid air from the Gulf of Mexico collides with a cooler air mass to the north of the cold front, widespread rain and thunderstorms will develop across the central and eastern thirds of the country. Severe thunderstorms will be possible over southern Iowa, northern Missouri and western Illinois. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. In addition, heavy rain associated with these thunderstorms will bring a chance of flash flooding to southeast South Dakota, northeast Nebraska, Iowa, northern Missouri and northwest Illinois. Scattered showers and thunderstorms will also be possible over the northern Plains, the Ohio Valley, the Tennessee Valley, the Mid-Atlantic and the Northeast. High pressure will keep conditions mostly clear across the southern Plains, while an onshore flow from the Gulf of Mexico will initiate isolate thunderstorms across the Gulf Coast and the the Southeast.

Meanwhile, an area of low pressure will continue to linger over northern California and Nevada. As this system interacts with monsoonal moisture, numerous clusters of thunderstorms will develop across the Intermountain West, the Great Basin and parts of the West Coast. High pressure over the eastern Pacific will keep conditions mostly clear across the Pacific Northwest and the Desert Southwest.

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About nationalsummary

This is the blog for the United States' national forecast. These summaries are by Weather Underground forecasters and are updated twice each day.