Weather Underground National Weather Summary

Weather Underground National Forecast for Wednesday, July 30, 2014

By: nationalsummary, 7:44 AM GMT on July 30, 2014

Weather Underground Forecast for Wednesday, July 30, 2014
A low pressure system will move across the southern Plains on Wednesday, while a cold front will dip southward over the Great Lakes.
A strong area of low pressure will inch eastward over the southern Plains on Wednesday. As this system draws warm, humid air from the Gulf of Mexico, widespread rain and thunderstorms will develop across the central Rockies, the central and southern Plains, and the lower Mississippi Valley. Heavy rain associated with these thunderstorms will bring a threat of flash flooding to southeast Wyoming, Colorado, northeast New Mexico, southwest Kansas, Oklahoma, northern Texas, southwest Arkansas and northwest Louisiana.
Meanwhile, a cold front will dip southward over the upper Midwest and the eastern Great Lakes. Scattered showers and thunderstorms will be possible over the upper Mississippi Valley, the Great Lakes, the Ohio Valley and parts of the Northeast. In addition, a cold front will extend across the Eastern Seaboard. Showers and thunderstorms will also trail this cold front and affect parts of the East Coast and the Southeast.
Out west, monsoonal moisture will continue to spread across the Intermountain West and the Great Basin. Isolated thunderstorms are expected to develop across a handful of states, which will bring a chance of flash flooding to valleys adjacent to sloped terrain. High pressure will keep conditions clear across the West Coast on Wednesday.

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Weather Underground National Recap for Tuesday, July 29, 2014

By: nationalsummary, 9:57 AM GMT on July 29, 2014

Weather Underground midday recap for Tuesday, July 29, 2014
An area of low pressure inched over the central Plains on Tuesday, while monsoonal moisture surged across the western half of the country.
An area of low pressure deepened over the central Rockies and the central Plains on Tuesday. As this system interacted with warm, muggy air from the Gulf of Mexico, strong thunderstorms developed over the nation’s midsection. Heavy rain associated with these thunderstorms affected parts of Wyoming and Colorado, as flash flood warnings were issued in both states. Grand Junction, Colo., reported a midday total of 0.76 inches of rain, while Laramie, Wyo., reported a midday total of 0.52 inches of rain. Flash flood watches were also issued in eastern New Mexico, northern Texas, western Oklahoma and southwest Kansas. Floyd, N.M., reported a midday total of 1.98 inches of rain, while Roswell, N.M., reported a midday total of 1.94 inches of rain. Just to the west, monsoonal moisture surged across the Great Basin. This moisture aided in the development of thunderstorms across the region, as flash flood watches were issued in parts of Utah, Nevada and Idaho. High pressure over the eastern Pacific kept conditions mostly clear across the West Coast on Tuesday.
Meanwhile, a cold front extended across the Gulf Coast and the Eastern Seaboard. Isolated thunderstorms developed over the western and eastern sides of the Gulf Coast. Brooksville, Fla., reported a midday total of 1.14 inches of rain. A separate cold front began to dip southward over the Great Lakes, which brought scattered showers and thunderstorms to the upper Midwest. The East Coast stayed mostly clear of wet weather.

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Weather Underground National Forecast for Tuesday, July 29, 2014

By: nationalsummary, 9:57 AM GMT on July 29, 2014

Weather Underground Forecast for Tuesday, July 29, 2014
A strong low pressure system will move across the Northeast on Tuesday, while monsoonal moisture will surge across the western half of the country.
A strong area of low pressure will move northeastward over the northeastern corner of the country. This system will bring moderate to heavy rain to New England, while the northern Mid-Atlantic will stay mostly clear of precipitation. In addition, a cold front associated with this system will extend across the Eastern Seaboard, the Gulf Coast and the southern Plains. As warm, humid air from the Gulf of Mexico interacts with this frontal boundary, showers and thunderstorms will develop over the southern Mid-Atlantic, parts of the Southeast, the Gulf Coast and the southern Plains. A separate low pressure system will inch across the Great Lakes on Tuesday. This system will bring a chance of rain and thunderstorms to the Great Lakes, the Ohio Valley and the upper Mississippi Valley.
Meanwhile, monsoonal moisture will continue to surge across the Intermountain West, the Great Basin and the Desert Southwest. Widespread thunderstorms will develop across the western half of the country, as flash flooding will be possible over northern Texas, western Oklahoma, southwest Kansas, northeast New Mexico and southeast Colorado. There will also be a chance of flash flooding over the Southwest and the Great Basin, especially across valleys adjacent to sloped terrain. High pressure over the eastern Pacific will keep conditions mostly clear across the West Coast on Tuesday.

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Weather Underground National Recap for Monday, July 28, 2014

By: nationalsummary, 12:10 PM GMT on July 28, 2014

Weather Underground midday recap for Monday, July 28, 2014
A low pressure system moved across the Northeast on Monday, while monsoonal thunderstorms continued to develop over the Intermountain West, the Great Basin and the Southwest.
A strong low pressure system moved northeastward over the northeastern corner of the country on Monday. As this system collided with a warm, humid air mass, strong to severe thunderstorms developed across a handful of states. Severe thunderstorm warnings were issued in New Hampshire, while severe thunderstorm watches were draped across New England. A tornado reportedly touched down in Revere, Mass., while Mount Washington, N.H., recorded wind speeds of 58 mph. In addition, flash flood warnings were issued in New York and Massachusetts as heavy rain accompanied these thunderstorms. Rochester, N.Y., reported a midday total of 2.98 inches of rain, while North Adams, Mass., reported a midday total of 1.44 inches of rain. A cold front associated with this low pressure system extended across the Mid-Atlantic, the Southeast, the lower Mississippi Valley and the southern Plains. Showers and thunderstorms developed along the western end of the frontal boundary over northern Texas and southern Oklahoma.
Meanwhile, monsoonal thunderstorms continued to pop up across the Intermountain West, the Great Basin and the Southwest on Monday. Flash flood warnings were issued in southern Nevada, while flash flood watches were issued across Colorado, New Mexico, Arizona, Utah, Nevada and southern California. High pressure kept the majority of the West Coast clear of wet weather. .

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Weather Underground National Forecast for Monday, July 28, 2014

By: nationalsummary, 12:10 PM GMT on July 28, 2014

Weather Underground Forecast for Monday, July 28, 2014
A cold front will extend from the southern Plains to the Northeast on Monday, while monsoonal moisture will surge across the western third of the country.
A cold front will extend across the southern Plains, the lower Mississippi Valley, the Tennessee Valley, the Mid-Atlantic and the Northeast on Monday. As this frontal boundary collides with warm, humid air from the Gulf of Mexico, strong to severe thunderstorms will develop across a handful of states. Severe thunderstorms will be possible over southeast Louisiana, southern Mississippi, southern Alabama, northern Florida, southern Georgia, eastern South Carolina and southeast North Carolina. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. In addition, rain and thunderstorms will develop across the northern Mid-Atlantic and the Northeast, which could lead to flash flooding over Upstate New York and northwest New England. Disorganized showers and thunderstorms will also be possible across parts of the southern Plains and the upper Mississippi Valley.
Meanwhile, monsoonal moisture will continue to surge across the Intermountain West, the Great Basin and the Desert Southwest on Monday. This moisture will initiate widespread showers and thunderstorms across the region. Flash flooding will be possible over northeast New Mexico and southeast Colorado. 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 Thursday, July 17, 2014

By: nationalsummary, 10:11 PM GMT on July 16, 2014

Weather Underground Forecast for Thursday, July 17, 2014

An area of low pressure will deepen over the southern Plains on Thursday, while a cold front will extend across the Gulf Coast and the Eastern Seaboard.

An area of low pressure is forecast to inch across the southern Plains on Thursday. As this system draws warm, humid air from the Gulf of Mexico, strong to severe thunderstorms will develop over the nation’s midsection. Severe thunderstorms will be possible over central and eastern Texas, northwest Louisiana, southwest Arkansas and southeast Oklahoma. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. In addition, heavy rain associated with this slow moving system will bring a chance of flash flooding to northeast Texas, southeast Oklahoma, Arkansas, northern Louisiana and northwest Mississippi. Disorganized thunderstorms will also push across the central Plains and the Tennessee Valley.

Meanwhile, a cold front will extend across the Gulf Coast and the Eastern Seaboard on Thursday. Showers and thunderstorms associated with this frontal boundary will linger over the northern Mid-Atlantic, New England and parts of the Southeast. High pressure will build to over the Great Lakes, which will keep conditions clear across the upper Midwest.

Out west, monsoonal moisture will bring scattered thunderstorms to parts of the Intermountain West, the Great Basin and the Desert Southwest. Flash flooding will be possible in valleys adjacent to sloped terrain, especially along the northern Sierra Nevadas.

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Weather Underground National Forecast for Wednesday, July 16, 2014

By: nationalsummary, 10:11 PM GMT on July 15, 2014

Weather Underground Forecast for Wednesday, July 16, 2014

A cold front will extend from the lower Mississippi Valley to the Northeast on Wednesday, while an area of low pressure will deepen over the southern Plains.

A low pressure system is forecast to deepen as it inches over the southern Plains. As warm, humid air interacts with this system, strong to severe thunderstorms will develop across the nation’s midsection. Severe thunderstorms will be possible over Wyoming, Colorado, New Mexico, northern Texas, Kansas, Oklahoma and western Nebraska. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. Monsoonal moisture will also bring scattered showers and thunderstorms to parts of the Great Basin and the Desert Southwest. The West Coast will stay mostly clear of precipitation due to a ridge of high pressure over the eastern Pacific.

Meanwhile, an area of low pressure will push east northeastward over southeast Canada. A cold frontal boundary associated with this system will extend across the Northeast, the Mid-Atlantic and the Gulf Coast on Wednesday. As this front overruns a warm, muggy air mass, widespread rain and thunderstorms will develop across the Gulf Coast, the Southeast and the Eastern Seaboard. The strongest storms will focus over the northern Mid-Atlantic and New England. Light, scattered showers will also be possible across the upper Midwest and the Ohio Valley.

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Weather Underground National Forecast for Tuesday, July 15, 2014

By: nationalsummary, 10:11 PM GMT on July 14, 2014

Weather Underground Forecast for Tuesday, July 15, 2014

A cold front will extend from the Intermountain West to the eastern Great Lakes on Tuesday, while high pressure will focus over the northern Plains.

A cold front will stretch across the Intermountain West, the southern Plains, the lower Mississippi Valley, the Tennessee Valley and the Ohio Valley on Tuesday. Warm, humid air will interact with the western side of the frontal boundary to initiate strong to severe thunderstorms over the central Plains. Severe thunderstorms will be possible over southeast Wyoming and eastern Colorado. 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 northeast New Mexico, eastern Colorado and southeast Wyoming. Meanwhile, severe thunderstorms will also develop along the eastern end of the cold front, focusing over northeast South Carolina, eastern North Carolina, eastern Virginia, eastern Maryland and southern New Jersey. These thunderstorms will also be capable of producing large hail, dangerous straight line winds and tornadoes. Flash flooding will be possible over the northern Mid-Atlantic and southern New England on Tuesday. Disorganized thunderstorms are forecast to develop over the southern Plains, the lower Mississippi Valley, the Gulf Coast and the Southeast as this cold front sinks southeastward. Low pressure over the Great Lakes will also usher showers and thunderstorms across the upper Midwest.

Monsoonal thunderstorms will continue to pop up over the Intermountain West, the Great Basin and the Desert Southwest. Flash flooding may occur along valleys adjacent to sloped terrain. A ridge of high pressure over the eastern Pacific will keep conditions clear across the West Coast.

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Weather Underground National Forecast for Monday, July 14, 2014

By: nationalsummary, 10:11 PM GMT on July 13, 2014

Weather Underground Forecast for Monday, July 14, 2014

A cold frontal boundary will extend from the southern Plains to the Northeast on Monday, while monsoonal thunderstorms will make a return to the Desert Southwest.

A cold front will extend across the southern Plains, the middle Mississippi Valley, the Ohio Valley and the Northeast on Monday. As this cold front overruns a warm, humid air mass, widespread strong to severe thunderstorms will develop across the central and eastern thirds of the country. Severe thunderstorms will be possible across the middle Mississippi Valley and the Ohio Valley. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. Strong thunderstorms will also move across the Tennessee Valley, the northern Mid-Atlantic, the eastern Great Lakes and parts of the Northeast.

A separate cold front will extend across the northern Plains and the upper Midwest. Rain and thunderstorms are expected to push across the upper Mississippi Valley and the western Great Lakes. In addition, temperatures are forecast to be 10 to 20 degrees below normal across the northern tier of the country. To the south, sea breeze induced thunderstorms will develop over Florida, while an onshore flow from the Gulf of Mexico will bring scattered thunderstorms to the Gulf Coast.

Monsoonal thunderstorms will make a return to the Intermountain West, the Great Basin and the Desert Southwest on Monday. These thunderstorms will bring a threat of flash flooding to valleys adjacent to sloped terrain. High pressure over the eastern Pacific will keep the majority of the West Coast clear of precipitation.



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Weather Underground National Forecast for Sunday, July 13, 2014

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

Weather Underground Forecast for Sunday, July 13, 2014

A cold frontal boundary will extend from the southern Plains to the central Great Lakes on Sunday, while a separate cold front will stretch from the Intermountain West to the western Great Lakes.

A cold front is forecast to extend across the southern Plains, the middle Mississippi Valley, the upper Midwest and the central Great Lakes on Sunday. As warm, humid air interacts with this frontal boundary, strong to severe thunderstorms will develop over the eastern third of the country. Severe thunderstorms will be possible across eastern Missouri, southern Illinois, Indiana, Kentucky, Ohio, northwest West Virginia, Pennsylvania and New York. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. Disorganized thunderstorms will also move across parts of the southern and central Plains, as well as the middle Mississippi Valley. Temperatures are expected to drop 10 to 20 degrees behind this frontal boundary over the northern Plains, the upper Midwest and the Ohio Valley. A separate cold front will stretch across the upper Intermountain West, the northern Plains and the upper Mississippi Valley. This system will usher showers across the northern tier of the country on Sunday.

An onshore flow from the Gulf of Mexico will trigger thunderstorm activity over the Gulf Coast and the Deep South. Sea breeze induced thunderstorms will also pop up over parts of the Southeast and the southern Mid-Atlantic.

Out west, a trough of low pressure will bring scattered showers and thunderstorms to central Oregon and Washington. High pressure over the eastern Pacific will keep conditions clear across the remainder of the West Coast on Sunday.

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Weather Underground National Forecast for Saturday, July 12, 2014

By: nationalsummary, 10:11 PM GMT on July 11, 2014

Weather Underground Forecast for Saturday, July 12, 2014

A cold front will extend from the Intermountain West to the upper Midwest on Saturday, while an area of low pressure will deepen over the central Plains.

A low pressure system is expected to strengthen as it inches eastward over the central Plains. As warm, humid air interacts with this system, strong to severe thunderstorms will develop across the nation’s midsection. Severe thunderstorms will be possible over eastern Nebraska, northern Missouri, Iowa, southeast Minnesota, southern Wisconsin, northern Illinois, northern Indiana and southwest Michigan. 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 Iowa, southern Wisconsin, northern Illinois, northern Indiana and southern Michigan. Disorganized showers and thunderstorms will also move across the northern and central Plains, as well as the upper Mississippi Valley.

Meanwhile, a slow moving frontal boundary will linger over the Mid-Atlantic on Saturday. Scattered thunderstorms are expected to trail this system, which will be possible over the Southeast, the Tennessee Valley, the Mid-Atlantic, the Ohio Valley and parts of the Northeast.

Monsoonal thunderstorms will continue to impact the Intermountain West, the Great Basin and the Southwest. These thunderstorms will bring a threat of flash flooding to valleys adjacent to sloped terrain. High pressure over the eastern Pacific will keep conditions clear across the West Coast on Saturday. .

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Weather Underground National Forecast for Friday, July 11, 2014

By: nationalsummary, 10:11 PM GMT on July 10, 2014

Weather Underground Forecast for Friday, July 11, 2014

A cold frontal boundary will extend from the lower Mississippi Valley to the Mid-Atlantic on Friday, while a separate cold front will stretch from the upper Intermountain West to the upper Midwest.

A cold front will extend across the lower Mississippi Valley, the Southeast and the Mid-Atlantic on Friday. As this frontal boundary interacts with warm, humid air from the Gulf of Mexico, showers and thunderstorms will develop over the southern Mid-Atlantic, the Southeast and the Gulf Coast. Thunderstorms will be isolated in nature over the western and central Gulf Coast, while more organized thunderstorms are expected to develop over Florida. High pressure will keep conditions mostly clear across the Ohio Valley, the eastern Great Lakes and the Northeast.

Meanwhile, a separate cold front will extend across the Intermountain West, the northern Plains and the upper Midwest. Thunderstorms will likely develop along the eastern end of the frontal boundary over the northern Plains, the middle Mississippi Valley and the upper Mississippi Valley.

Just to the west, monsoonal moisture will spread across the Intermountain West, the Great Basin and the Desert Southwest, which will bring widespread showers and thunderstorms to the region. These thunderstorms will be capable of producing flash flooding, especially along valleys adjacent to sloped terrain. The strongest thunderstorms will focus over Colorado and Wyoming. 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 Thursday, July 10, 2014

By: nationalsummary, 10:11 PM GMT on July 09, 2014

Weather Underground Forecast for Thursday, July 10, 2014

A cold front will extend from the southern Plains to the Northeast on Thursday, while monsoonal moisture will move across the Desert Southwest.

A cold front will extend across the southern Plains, the lower Mississippi Valley, the Southeast and the Eastern Seaboard. As warm, humid air streams northward from the Gulf of Mexico, rain and thunderstorms will develop across the Mid-Atlantic, the Southeast, the Gulf Coast, the Deep South and the lower Mississippi Valley. In addition, an area of low pressure will deepen over the central Plains, which will bring scattered showers and thunderstorms to the northern and central Plains, as well as the middle and upper Mississippi Valley. An area of high pressure will build to the north of this frontal boundary, focusing over the Great Lakes. This will bring cool, dry conditions to the Ohio Valley, the upper Midwest and the Northeast.

Meanwhile, monsoonal moisture will continue to surge across the Desert Southwest, the Great Basin and the Intermountain West. This moisture will aid in producing isolated thunderstorms across the region. These thunderstorms will bring a threat of flash flooding to valleys adjacent to sloped terrain. 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 Wednesday, July 09, 2014

By: nationalsummary, 10:11 PM GMT on July 08, 2014

Weather Underground Forecast for Wednesday, July 09, 2014

A cold frontal boundary will extend from the southern Plains to the Northeast on Wednesday, while a separate cold front will move across the northwestern corner of the country.

A cold front will extend across the southern Plains, the lower Mississippi Valley, the Tennessee Valley, the northern Mid-Atlantic and the Northeast on Wednesday. A warm, humid air mass from the Gulf of Mexico will interact with this cold front to initiate widespread showers and thunderstorms. Stormy weather will develop ahead of this frontal boundary over the southern Plains, the lower Mississippi Valley, the central and eastern Gulf Coast, the Southeast, the Mid-Atlantic and the Northeast. High pressure will keep conditions mostly clear across the Ohio Valley, the western Great Lakes and the upper Mississippi Valley.

Meanwhile, monsoonal moisture will continue to initiate scattered showers and thunderstorms over the Intermountain West, the Great Basin and parts of the Desert Southwest. These thunderstorms will bring a threat of flash flooding to valleys adjacent to sloped terrain.

A separate cold front is forecast to move across the northwestern corner of the country on Wednesday. Little to no precipitation will accompany this frontal boundary as it inches across the Pacific Northwest. A large ridge of high pressure will dominate the West Coast, which will keep conditions warm and dry across the region. Temperatures are forecast to jump into the triple digits across much of the Southwest. .

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Weather Underground National Forecast for Tuesday, July 08, 2014

By: nationalsummary, 10:11 PM GMT on July 07, 2014

Weather Underground Forecast for Tuesday, July 08, 2014

A cold frontal boundary will extend from the southern Plains to the upper Midwest on Tuesday, while a ridge of high pressure will build over the Intermountain West.

A cold front will stretch across the southern Plains, the middle Mississippi Valley and the upper Midwest on Tuesday. As warm, muggy air collides with this frontal boundary, widespread strong to severe thunderstorms will develop over the eastern third of the country. Severe thunderstorms will be possible over northern Arkansas, southern Missouri, Tennessee, Kentucky, southern Illinois, southern Indiana, southeast Ohio, northwest Virginia, West Virginia, western Maryland, Pennsylvania, New York and Vermont. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. In addition, disorganized showers and thunderstorms will move across parts of the upper Mississippi Valley and the Great Lakes.

Meanwhile, an onshore flow from the Gulf of Mexico will bring scattered showers and thunderstorms to the Gulf Coast, while sea-breeze induced thunderstorms will affect portions of Florida. The remainder of the Deep South will stay warm and dry.

Monsoonal moisture will continue to initiate thunderstorms across the Desert Southwest on Tuesday. These thunderstorms will be capable of producing heavy rain, which will bring a threat of flash flooding to valleys adjacent to sloped terrain. High pressure will keep the West Coast, the Pacific Northwest and the upper Intermountain West clear of precipitation.

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Weather Underground National Forecast for Monday, July 07, 2014

By: nationalsummary, 10:11 PM GMT on July 06, 2014

Weather Underground Forecast for Monday, July 07, 2014

A cold frontal boundary will extend from the Intermountain West to the central Great Lakes on Monday, while a ridge of high pressure will build over the eastern Pacific.

A cold front will stretch across the Intermountain West, the central Plains, the middle Mississippi Valley and the central Great Lakes. As this cold front moves over a warm, humid air mass, strong to severe thunderstorms will develop across the central and eastern thirds of the country. Severe thunderstorms will be possible over Nebraska, northern Kansas, Missouri, Iowa, southern Minnesota, Illinois, Kentucky, southern Indiana, southern Ohio, West Virginia and southwest Pennsylvania. 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 eastern Nebraska, Iowa, northern Missouri and northwest Indiana. Disorganized thunderstorms will also be possible across the northern Plains and the Northeast on Monday, while an onshore flow from the Gulf of Mexico will bring scattered thunderstorms to the Gulf Coast.

Meanwhile, monsoonal moisture will continue to trigger thunderstorm activity across the Four Corners and the Desert Southwest. These thunderstorms will be scattered in nature, but could lead to flash flooding along valleys that are adjacent to sloped terrain. The West Coast will stay mostly clear of wet weather on Monday due to a large ridge of high pressure over the eastern Pacific.

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Weather Underground National Forecast for Sunday, July 06, 2014

By: nationalsummary, 10:11 PM GMT on July 05, 2014

Weather Underground Forecast for Sunday, July 06, 2014

A cold frontal boundary will extend from the Intermountain West to the northern Plains on Sunday, while monsoonal moisture will continue to move across the Southwest.

A cold front will extend across the upper Intermountain West, the northern Plains and the upper Mississippi Valley. This system will override a warm, humid air mass to initiate widespread thunderstorms across the nation’s midsection. Severe thunderstorms will be possible over southeast Minnesota, Wisconsin, eastern Iowa and northern Illinois. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. Disorganized showers and thunderstorms will also be possible over the northern Plains, the Ohio Valley, the Great Lakes and parts of the Northeast. The southern Plains will stay mostly clear of precipitation.

An area of low pressure will develop over the coast of the Carolinas on Sunday. This system will bring a chance of rain and thunderstorms to South Carolina, Georgia and Florida. The remainder of the Eastern Seaboard will experience dry conditions due to a high pressure system over the southern Appalachians.

A separate area of high pressure will linger over the Four Corners. This system will draw monsoonal moisture from the eastern Pacific and Mexico to trigger thunderstorm activity across the Desert Southwest. A ridge of high pressure over the eastern Pacific will keep the West Coast clear of wet weather.

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Weather Underground National Forecast for Saturday, July 05, 2014

By: nationalsummary, 10:11 PM GMT on July 04, 2014

Weather Underground Forecast for Saturday, July 05, 2014

Hurricane Arthur will drift away from the northeastern corner of the country on Saturday, while a cold front will move across the northern Plains.

Hurricane Arthur will move northeastward away from the coast of New England on Saturday. Showers and thunderstorms will linger over northern New England, especially Maine, for the first half of the day before tapering off by the afternoon. An area of low pressure will also bring stormy weather to parts of the Southeast. High pressure will keep the remainder of the Eastern Seaboard clear of precipitation.

A cold front is forecast to extend across the northern Plains. This frontal boundary will push across a warm, humid air mass from the Gulf of Mexico to initiate strong to severe thunderstorms over the nation’s midsection. Severe thunderstorms will be possible over North Dakota and northwest Minnesota, which will be capable of producing large hail, dangerous straight line winds and isolated tornadoes.

Meanwhile, an area of high pressure over the Four Corners will drag monsoonal moisture across the Southwest on Saturday. Widespread showers and thunderstorms will be possible over the Intermountain West, the Great Basin and the Desert Southwest. Along the Pacific Northwest, an onshore flow will usher showers across parts of Washington. A ridge of high pressure will keep the rest of the West Coast mostly clear of wet weather.

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Weather Underground National Forecast for Friday, July 04, 2014

By: nationalsummary, 10:11 PM GMT on July 03, 2014

Weather Underground Forecast for Friday, July 04, 2014

Hurricane Arthur will continue to move across the Eastern Seaboard on Friday, while a cold frontal boundary will extend from the southern Plains to the Northeast.

Hurricane Arthur is forecast to intensify as it treks northward over the East Coast. Arthur is expected to be upgraded to a category 2 hurricane, with wind speeds ranging between 96 to 110 mph (83 to 95 kts). This system will move across the coast of the Carolinas and over the MId-Atlantic, which will bring heavy rain and thunderstorms to the region. For more information regarding Hurricane Arthur, please visit http://www.wunderground.com/hurricane/.

Meanwhile, a cold front will stretch across the southern Plains, the lower Mississippi Valley, the Southeast, the Appalachians and the eastern Great Lakes on Friday. As this frontal boundary pushes eastward over a warm, humid air mass, strong to severe thunderstorms will develop across a handful of states. Severe thunderstorms will be possible from northern Virginia to southern Maine. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. In addition, heavy rain associated with these thunderstorms could lead to flash flooding over the northern Mid-Atlantic and New England. Scattered showers and thunderstorms will also develop along the southern tier of the frontal boundary, focusing over the southern Plains, the Gulf Coast and the Southeast.

Monsoonal moisture will make a return to the Four Corners on Friday. This moisture will trigger thunderstorm activity across the Four Corners and the Intermountain West. High pressure will keep the majority of the West Coast clear of wet weather on Friday.

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Weather Underground National Forecast for Thursday, July 03, 2014

By: nationalsummary, 10:11 PM GMT on July 02, 2014

Weather Underground Forecast for Thursday, July 03, 2014

Tropical Storm Arthur will continue to inch slowly northward along the Eastern Seaboard on Thursday, while a cold frontal boundary will extend from the southern Plains to the Northeast.

Tropical Storm Arthur is forecast to inch slowly north northeastward over the southern Mid-Atlantic on Thursday. This system will be situated just to the east of Georgia and South Carolina, and is expected to bring showers and thunderstorms to northeast Florida, eastern Georgia and the Carolinas. Arthur will likely be upgraded to a category 1 hurricane, with wind speeds ranging between 74 to 95 mph (64 to 82 kts).

Meanwhile, a cold frontal boundary will stretch across the southern Plains, the lower Mississippi Valley, the Appalachians and the Northeast. As this system overruns a warm, humid air mass, rain and thunderstorms will develop across New England, the northern Mid-Atlantic, the eastern Ohio Valley, Gulf Coast and the southern Plains. Thunderstorms along the East Coast will interact with Tropical Storm Arthur, which could lead to flash flooding over eastern Virginia, eastern Maryland, Delaware and southern New Jersey. A ridge of high pressure will build behind this frontal boundary, keeping conditions cool and dry across the western Ohio Valley and the upper Midwest.

A separate frontal boundary will extend across the Intermountain West on Thursday. Scattered showers and thunderstorms will develop across the Rockies and the Four Corners as a result of this system. An area of low pressure will also move across the Northwest, ushering rainy weather over parts of Washington. A ridge of high pressure will keep conditions clear across the Southwest.

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Weather Underground National Forecast for Wednesday, July 02, 2014

By: nationalsummary, 10:11 PM GMT on July 01, 2014

Weather Underground Forecast for Wednesday, July 02, 2014

Tropical Storm Arthur will continue to develop along the southeastern corner of the country on Wednesday, while a cold front will extend from the southern Plains to the Northeast.

Tropical Storm Arthur is expected to drift slowly northward on Wednesday as it skims across the southeastern corner of the country. Arthur is forecast to bring showers and thunderstorms to eastern Florida and southeast Georgia, while gusty winds will also accompany this system. Wind speeds are expected to range between 39 to 73 mph (33 to 64 kts). For more information regarding Tropical Storm Arthur, please visit http://www.wunderground.com/hurricane/.

Meanwhile, a cold frontal boundary will extend across the southern Plains, the lower Mississippi Valley, the Ohio Valley and the Northeast. As this frontal boundary pushes across a warm, humid air mass, strong to severe thunderstorms will develop across a handful of states. Severe thunderstorms will be possible over northeast North Carolina, Virginia, eastern West Virginia, Maryland, Pennsylvania, New Jersey, New York and much of New England. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. Scattered showers and thunderstorms will also develop across the Ohio Valley, the lower Mississippi Valley, the southern Plains and the Intermountain West. High pressure will bring cool, dry conditions to the northern Plains and the upper Mississippi Valley.

Out west, a cold front will move eastward over the Pacific Northwest. Showers will be possible over northwest Washington, while the remainder of the West Coast will stay clear of wet weather.

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Weather Underground National Forecast for Tuesday, July 01, 2014

By: nationalsummary, 10:11 PM GMT on June 30, 2014

Weather Underground Forecast for Tuesday, July 01, 2014

A cold frontal boundary will extend from the southern Plains to the central Great Lakes on Tuesday, while an area of low pressure will linger over the east coast of Florida.

A cold front is forecast to extend across the southern Plains, the middle Mississippi Valley, the Ohio Valley and the central Great Lakes on Tuesday. As this frontal boundary collides with a warm, humid air mass, strong to severe thunderstorms will develop across a handful of states. Severe thunderstorms will be possible over northern Arkansas, southeast Missouri, Tennessee, Kentucky, southern Illinois, southern Indiana, Ohio, West Virginia, Pennsylvania and New York. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. Scattered showers and thunderstorms will also move across the southern Plains, the upper Mississippi Valley, the Mid-Atlantic and New England.

Meanwhile, a low pressure system will linger over the east coast of Florida. This system will have a high, 80% chance to develop into a tropical cyclone as it drifts southwestward over the western Atlantic. Florida and parts of the Southeast will experience rain and thunderstorms associated with this area of low pressure. Gusty winds will also accompany this system.

Out west, a low pressure system will shift across the Great Basin and the Four Corners. Isolated showers and thunderstorms will be possible across the Sierra Nevadas, the Great Basin and the Four Corners, especially during the afternoon. The remainder of the West Coast will stay clear of wet weather due to a ridge of high pressure over the eastern Pacific.

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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.

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