Weather Underground National Weather Summary

Weather Underground National Forecast for Monday, June 30, 2014

By: nationalsummary, 10:11 PM GMT on June 29, 2014

Weather Underground Forecast for Monday, June 30, 2014

A cold front will extend from the Great Basin to the upper Midwest on Monday, while an area of low pressure will linger over the southern Mid-Atlantic.

A strong low pressure system will inch across the northern tier of the country on Monday, focusing over the upper Mississippi Valley and the western Great Lakes. A cold frontal boundary associated with this system will extend across the Great Basin, the central Rockies, the central Plains and the upper Midwest. As warm, humid air collides with this frontal boundary, strong to severe thunderstorms will develop across the nation’s midsection. Severe thunderstorms will be possible across northern Texas, southeast Colorado, northern Oklahoma, Kansas, Arkansas, Iowa, Illinois, southern Wisconsin, northwest 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 could lead to flash flooding across the upper Mississippi Valley. Scattered showers and thunderstorms will also be possible over the northern Plains.

Meanwhile, an area of low pressure will inch southward along the coasts of Georgia and Florida on Monday. This system will bring very stormy weather to the southeast, and will have a high, 60% chance to develop into a tropical cyclone. Disorganized showers and thunderstorms will also be possible across the Ohio Valley and parts of the Northeast.

Out west, a ridge of high pressure over the eastern Pacific will keep conditions mostly clear across the West Coast. Temperatures will approach 110 degrees across the Desert Southwest on Monday.

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Weather Underground National Forecast for Saturday, June 28, 2014

By: nationalsummary, 10:11 PM GMT on June 27, 2014

Weather Underground Forecast for Saturday, June 28, 2014

A cold frontal boundary will extend from the Four Corners to the northern Plains on Saturday, while a separate cold front will move across the West Coast.

A cold frontal boundary will extend from the Four Corners to the northern Plains on Saturday. As this frontal boundary moves across a warm, humid air mass, strong to severe thunderstorms will develop across the central and northern Plains, as well as the middle and upper Mississippi Valley. Severe thunderstorms will be possible over eastern Kansas, northwest Missouri, western Iowa, Nebraska, western Minnesota, South Dakota and North Dakota. 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 across the upper Mississippi Valley. Scattered showers and thunderstorms will also develop over the northern Rockies.

Meanwhile, a cluster of thunderstorms will continue to impact the western and central Gulf Coast on Saturday. Persistent heavy rain will also bring a threat of flash flooding to this region. Sea breeze induced thunderstorms will pop up over parts of the Southeast and Florida, while a cold front will also bring stormy weather to the Ohio Valley and the Mid-Atlantic. The northeastern corner of the country will stay mostly clear of wet weather.

Out west, a cold front will move across the West Coast, bringing rainy weather to parts of Oregon and Washington. A ridge of high pressure over the eastern Pacific will keep the Desert Southwest warm and dry on Saturday. .

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Weather Underground National Forecast for Friday, June 27, 2014

By: nationalsummary, 10:11 PM GMT on June 26, 2014

Weather Underground Forecast for Friday, June 27, 2014

A cold front will stretch from the Great Basin to the northern Plains on Friday, while a separate cold front will extend from the central Appalachians to the southern Mid-Atlantic.

A cold front will stretch over the Great Basin, the Intermountain West and the northern Plains on Friday. As this frontal boundary moves across a warm, humid air mass, widespread strong to severe thunderstorms will develop across a handful of states. Severe thunderstorms will be possible over western Oklahoma, western and central Kansas, eastern Colorado, Nebraska, South Dakota and North Dakota. 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 North Dakota, South Dakota, northwest Iowa and southwest Minnesota. Scattered showers and thunderstorms will also develop across the Intermountain West and the Mississippi Valley.

Meanwhile, a cluster of rain and thunderstorms will inch across the western and central Gulf Coast. Just to the east, showers and thunderstorms are forecast to develop along a cold front extending across the Tennessee Valley and the southern Mid-Atlantic. Stormy weather will stretch as far south as Florida. An area of low pressure over the coast of the northern Mid-Atlantic will usher scattered showers across Pennsylvania, New York and southern New England, while northern New England will stay mostly clear of wet weather.

Out west, an onshore flow from the Pacific will push rain across the Pacific Northwest. The remainder of the West Coast will avoid precipitation due to a ridge of high pressure over the eastern Pacific.

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Weather Underground National Forecast for Thursday, June 26, 2014

By: nationalsummary, 10:11 PM GMT on June 25, 2014

Weather Underground Forecast for Thursday, June 26, 2014

An area of low pressure will move over the Intermountain West and the central Plains on Thursday, while a separate low pressure system will inch across the Northeast.

A low pressure system will continue to push eastward over the Intermountain West and the central Plains. As this system collides with a warm, muggy air mass from the Gulf of Mexico, strong to severe thunderstorms will develop over the nation’s midsection. Severe thunderstorms will be possible over western Oklahoma, eastern Colorado, western Kansas, western and central Nebraska, eastern Wyoming, South Dakota, southwest North Dakota and eastern Montana. 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 Montana. Scattered showers and thunderstorms will also move across the Intermountain West, the Mississippi Valley and the western Gulf Coast.

A separate cold front will extend across the eastern Tennessee Valley, the Mid-Atlantic and the Northeast on Thursday. Rain and thunderstorms will accompany this system and move across the northeastern corner of the country. An onshore flow from the Atlantic will also bring thunderstorms to the Southeast.

Out west, rainy weather will linger over northern California, Oregon and Washington. High pressure will keep conditions warm and dry across Desert Southwest, as temperatures are forecast to jump into the triple digits across the region. .

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Weather Underground National Forecast for Wednesday, June 25, 2014

By: nationalsummary, 10:11 PM GMT on June 24, 2014

Weather Underground Forecast for Wednesday, June 25, 2014

A cold front will stretch from the northern Plains to the Northeast on Wednesday, while a separate cold front will extend from the Great Basin to the upper Intermountain West.

A cold front will extend across the northern Plains, the upper Midwest, the Great Lakes and the Northeast on Wednesday. As warm, muggy air interacts with this frontal boundary, widespread rain and thunderstorms will develop across the Mississippi Valley, the Ohio Valley, the Mid-Atlantic and the Northeast. Heavy rain associated with these thunderstorms will bring a chance of flash flooding to a handful of states, including West Virginia, Pennsylvania, New York, Connecticut, Massachusettes, Vermont, New Hampshire and Maine. Heavy rain and thunderstorms will also develop along the western Gulf Coast, while scattered showers and thunderstorms will be possible over the eastern Gulf Coast and the Southeast.

Meanwhile, a separate cold front will stretch across the Great Basin and the Intermountain West on Wednesday. As this frontal boundary collides with humid air over the Plains, strong to severe thunderstorms will develop over eastern Colorado, western Kansas, western Nebraska, eastern Wyoming, western South Dakota, southeast Montana and southwest North Dakota. These thunderstorms will capable of producing large hail, dangerous straight line winds and isolated tornadoes. In addition, scattered showers will push across parts of the Pacific Northwest and the upper Intermountain West. High pressure will keep conditions clear across the Southwest on Wednesday.

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Weather Underground National Forecast for Tuesday, June 24, 2014

By: nationalsummary, 10:10 PM GMT on June 23, 2014

Weather Underground Forecast for Tuesday, June 24, 2014

A cold frontal boundary will extend from the southern Plains to the upper Midwest on Tuesday, while a separate cold front will approach the Pacific Northwest.

A cold frontal boundary is forecast to stretch across the southern Plains, the middle Mississippi Valley, the upper Midwest and the central Great Lakes on Tuesday. As this system inches eastward over a warm, muggy air mass, widespread rain and thunderstorms will develop across the central Plains, the Mississippi Valley, the Tennessee Valley and the Ohio Valley. Severe thunderstorms will be possible over eastern Colorado, northeast New Mexico, northern Texas, western Oklahoma and western Kansas. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. Thunderstorms will also bring heavy rain to the lower Mississippi Valley region, which could lead to flash flooding over northeast Texas, southeast Oklahoma and southwest Arkansas. In addition, low pressure along the northern end of the frontal boundary will usher stormy weather across the northern Mid-Atlantic and the Northeast. An onshore flow from the Atlantic will also initiate isolated thunderstorms across the Southeast.

Meanwhile, a separate cold front will dip southward over the northern tier of the country, extending from the northern Plains to the central Great Lakes. Scattered thunderstorms are expected to develop along this frontal boundary as it moves across the region on Tuesday.

Out west, a low pressure system will approach the northwestern corner of the country. This system will push light showers over the Pacific Northwest, while scattered showers and thunderstorms will be possible over the upper Intermountain West. The remainder of the West Coast will avoid wet weather due to a ridge of high pressure over the eastern Pacific.

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Weather Underground National Forecast for Monday, June 23, 2014

By: nationalsummary, 10:10 PM GMT on June 22, 2014

Weather Underground Forecast for Monday, June 23, 2014

A low pressure system will continue moving eastward across the nation on Monday, increasing the chance of showers and thunderstorms across the Eastern Valleys. The system will continue pushing a cold front eastward, which will trigger more showers and thunderstorms from the Great Lakes through the Gulf Coast. Severe storms are not anticipated along this front, but some storms may produce some large hail and strong winds. Expect rainfall totals to range around 1 inch, with up to 2 inches possible in areas of severe thunderstorm development. Strongest storm activity is anticipated in the afternoon and evening hours across the Deep South as ample Gulf moisture will aid in thunderstorm development. The cold front sweeping towards the East Coast will also bring cooler temperatures to the Eastern states. Expect mild temperatures for the region with highs in the 70s for the Northeast and highs in the mid-80s across the Mid-Atlantic states.

Behind this system, another weaker trough of low pressure will move off the Central Rockies and into the Central Plains. Due to prevailing warm and humid conditions, this will allow for a few showers and thunderstorms to pop up across eastern Colorado and into Kansas. There is a slight chance that these storms will turn severe with strong winds, damaging winds, and periods of heavy rainfall. Further West, expect dry and warm temperatures to continue for the West Coast as a ridge of high pressure remains the dominant weather feature. Near-normal high temperatures are expected with highs in the 70s along the coast to 80s inland, and reaching into the lower 100s in the desserts.

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Weather Underground National Forecast for Sunday, June 22, 2014

By: nationalsummary, 10:10 PM GMT on June 21, 2014

Weather Underground Forecast for Sunday, June 22, 2014

A cold frontal boundary will stretch across the Tennessee Valley and the Southeast on Sunday, while a separate cold front will extend from the Intermountain West to the upper Midwest.

A cold front is forecast to stretch across the Tennessee Valley and the southern Mid-Atlantic on Sunday. As warm, muggy air from the Gulf of Mexico interacts with this system, widespread rain and thunderstorms will develop across the Gulf Coast, the Southeast and the Mid-Atlantic. Just to the north, scattered showers will linger over northern New England. Rain will concentrate mostly over Maine

A separate cold front will stretch across the central Rockies, the central Plains and the upper Mississippi Valley on Sunday. As this front moves over warm, muggy air, strong thunderstorms will break out across the nation’s midsection. 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 chance of flash flooding to northern Texas, the Oklahoma Panhandle, Kansas, eastern Colorado and southern Nebraska. Isolated showers and thunderstorms are also forecast to develop over the Intermountain West.

Meanwhile, a ridge of high pressure will continue to build over the eastern Pacific, keeping conditions warm and dry across the West Coast.

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Weather Underground National Forecast for Saturday, June 21, 2014

By: nationalsummary, 10:10 PM GMT on June 20, 2014

Weather Underground Forecast for Saturday, June 21, 2014

A cold frontal boundary will extend from the Great Basin to the northern Plains on Saturday, while a separate frontal boundary will stretch from the upper Midwest to the Mid-Atlantic.

Active weather will impact the nation’s midsection on Saturday. As a warm, humid air mass moves northward from the Gulf of Mexico, it will collide with a cold front extending from the Great Basin to the northern Plains. Strong to severe thunderstorms will develop across a handful of states, as severe thunderstorms will be possible over South Dakota, Nebraska, northeast Colorado, northern Kansas, southwest Minnesota, Iowa, Missouri and Illinois. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. Scattered showers and thunderstorms will also be possible across the Intermountain West and the southern Plains. A separate frontal boundary stretching from the upper Midwest to the Mid-Atlantic will bring stormy conditions to the Ohio Valley, the Tennessee Valley, the Gulf Coast, the Southeast and the Mid-Atlantic. The northeastern corner of the country will stay mostly clear of wet weather.

Out west, a ridge of high pressure will continue to build over the eastern Pacific. This system will bring warm, dry conditions to the Desert Southwest. Temperatures are forecast to approach 110 degrees across the southern California and Arizona deserts on Saturday.

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Weather Underground National Forecast for Friday, June 20, 2014

By: nationalsummary, 10:10 PM GMT on June 19, 2014

Weather Underground Forecast for Friday, June 20, 2014

A cold frontal boundary will extend from the southern Plains to the upper Midwest on Friday, while a separate cold front will move across the Pacific Northwest.

A cold front will continue to inch across the nation’s midsection on Friday. As warm, muggy air interacts with this system, showers and thunderstorms will develop across the southern and central Plains, the Mississippi Valley, the Tennessee Valley and the Ohio Valley. Scattered showers and isolated thunderstorms will be possible over parts of the Gulf Coast. Meanwhile, a separate frontal boundary will extend across the central Appalachians and the Mid-Atlantic. Heavy rain and strong thunderstorms will develop over a handful of Mid-Atlantic states, which could lead to flash flooding in southeast Ohio, southwest Pennsylvania and West Virginia. To the south, thunderstorms along a sea breeze will continue to develop over central and southern Florida.

Out west, a cold front will move east southeastward over the northwestern corner of the country. This system will bring rainy weather to the Pacific Northwest, while showers and thunderstorms are expected to develop over the upper Intermountain West. The remainder of the West Coast will stay clear of wet weather due to a ridge of high pressure over the eastern Pacific. Temperatures will jump into the triple digits across the Desert Southwest on Friday.

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Weather Underground National Forecast for Thursday, June 19, 2014

By: nationalsummary, 10:10 PM GMT on June 18, 2014

Weather Underground Forecast for Thursday, June 19, 2014

A cold frontal boundary will extend from the Four Corners to the northern Plains on Thursday, while a separate cold front will stretch from the upper Midwest to the Mid-Atlantic.

Active weather will continue to impact the nation’s midsection on Thursday. As warm, muggy air from the Gulf of Mexico collides with a cold front stretching from the Four Corners to the upper Mississippi Valley, strong to severe thunderstorms will develop across the Plains and the Mississippi Valley. Severe thunderstorms will be possible across parts of northern Texas, western Oklahoma, Kansas, eastern Nebraska, northwest Missouri, Iowa, eastern South Dakota, western Illinois and southwest Wisconsin. 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 across the upper Mississippi Valley. An area of low pressure along the northern end of the frontal boundary will also usher scattered showers and thunderstorms across the Intermountain West.

Meanwhile, a separate cold front will extend across the upper Midwest, the Ohio Valley and the Mid-Atlantic on Thursday. As a result, a large cluster of rain and thunderstorms will push across the region. Scattered showers and isolated thunderstorms will also be possible across the Gulf Coast, the Tennessee Valley and the Southeast.

Out west, an onshore flow from the Atlantic will push rainy weather over the Pacific Northwest. High pressure over the eastern Pacific will keep the Southwest warm and dry on Thursday.

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Weather Underground National Forecast for Wednesday, June 18, 2014

By: nationalsummary, 7:49 AM GMT on June 18, 2014

Weather Underground Forecast for Wednesday, June 18, 2014

A cold front will extend from the Southwest to the central Plains on Wednesday, while a separate cold front will stretch from the upper Midwest to the Northeast.

An area of low pressure will deepen over the central Plains on Wednesday. As warm, muggy air from the Gulf of Mexico interacts with this system, widespread showers and thunderstorms will develop across the nation’s midsection. A cluster of severe thunderstorms will be possible from northern Texas to North Dakota, and as far east as 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 North Dakota, eastern South Dakota, eastern Nebraska, Minnesota, northern Iowa, southwest Wisconsin and northern Illinois. Scattered showers and thunderstorms will also be possible across the Intermountain West, which will bring a threat of flash flooding to northwest Montana.

A separate area of low pressure will move eastward across the Great Lakes on Wednesday. Severe thunderstorms are forecast to impact the Ohio Valley and the northern Mid-Atlantic. Flash flooding will be possible over southeast Michigan, northeast Ohio, Pennsylvania and New Jersey. Rain and thunderstorms are also expected to push across the Northeast.

Isolated showers and thunderstorms will continue to pop up along the Gulf Coast and the Southeast on Wednesday. There will be a threat of flash flooding over southwest Florida as heavy rain is expected to move across the state. The southern Mid-Atlantic will stay clear of wet weather.



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Weather Underground National Forecast for Wednesday, June 18, 2014

By: nationalsummary, 10:10 PM GMT on June 17, 2014

Weather Underground Forecast for Wednesday, June 18, 2014
A cold front will extend from the Southwest to the central Plains on Wednesday, while a separate cold front will stretch from the upper Midwest to the Northeast.
An area of low pressure will deepen over the central Plains on Wednesday. As warm, muggy air from the Gulf of Mexico interacts with this system, widespread showers and thunderstorms will develop across the nation’s midsection. A cluster of severe thunderstorms will be possible from northern Texas to North Dakota, and as far east as 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 North Dakota, eastern South Dakota, eastern Nebraska, Minnesota, northern Iowa, southwest Wisconsin and northern Illinois. Scattered showers and thunderstorms will also be possible across the Intermountain West, which will bring a threat of flash flooding to northwest Montana.
A separate area of low pressure will move eastward across the Great Lakes on Wednesday. Severe thunderstorms are forecast to impact the Ohio Valley and the northern Mid-Atlantic. Flash flooding will be possible over southeast Michigan, northeast Ohio, Pennsylvania and New Jersey. Rain and thunderstorms are also expected to push across the Northeast.
Isolated showers and thunderstorms will continue to pop up along the Gulf Coast and the Southeast on Wednesday. There will be a threat of flash flooding over southwest Florida as heavy rain is expected to move across the state. The southern Mid-Atlantic will stay clear of wet weather.

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Weather Underground National Forecast for Tuesday, June 17, 2014

By: nationalsummary, 10:10 PM GMT on June 16, 2014

Weather Underground Forecast for Tuesday, June 17, 2014
A cold frontal boundary will extend from the Great Basin to the upper Midwest on Tuesday, while a ridge of high pressure will continue to park itself over the eastern Pacific.
A cold front will stretch across the Great Basin, the Intermountain West, the central Plains and the upper Midwest on Tuesday. As warm, humid air collides with this frontal boundary, widespread heavy rain and thunderstorms will develop across the northern tier of the country. Severe thunderstorms will be possible over eastern Montana, North Dakota, South Dakota, Minnesota, northeast Iowa, northern Illinois, Wisconsin and 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 threat of flash flooding to northeast Montana, southeast Minnesota, northeast Iowa and southwest Wisconsin.
Meanwhile, an onshore flow from the Gulf of Mexico will trigger rain and thunderstorm activity across the Gulf Coast and the Southeast. Similar conditions will also be possible over the Mid-Atlantic and parts of the Northeast on Tuesday.
Portions of the Pacific Northwest will experience rainy weather due to an onshore flow from the Pacific. A ridge of high pressure will keep the remainder of the West Coast clear of wet weather. Temperatures are forecast to range between the 90s and 100s across the Desert Southwest. .

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Weather Underground National Recap for Monday, June 16, 2014

By: nationalsummary, 10:14 AM GMT on June 16, 2014

Weather Underground midday recap for Monday, June 16, 2014
A cold front extended from the Great Basin to the northern Plains on Monday, while a separate cold front stretched from the middle Mississippi Valley to the Great Lakes.
A cold front extended across the middle Mississippi Valley and the Great Lakes on Monday. As warm, humid air interacted with this system, strong to severe thunderstorms developed across a handful of states. The strongest thunderstorms developed across the northern Plains and the upper Mississippi Valley, as tornado watches were issued in northwest Iowa and southwest Minnesota. Severe thunderstorm warnings were also issued in southeast South Dakota and southwest Minnesota. Burwell, Neb., reported golf ball sized hail, while Utica, Neb., reported tennis ball sized hail. These thunderstorms also brought heavy rain to the region, as flash flood warnings were issued in eastern South Dakota, southwest Minnesota and northwest Iowa. Tekamah, Neb., reported a midday total of 0.95 inches of rain, while Watertown, S.D., reported a midday total of 0.83 inches of rain. In addition, isolated showers and thunderstorms moved across the Ohio Valley, the Northeast and the Mid-Atlantic on Monday.
Meanwhile, high pressure kept conditions mostly clear across the Four Corners and the southern Plains. An onshore flow from the Gulf of Mexico initiated rain and thunderstorms across parts of the Gulf Coast and the Southeast. Immokalee Regional Airport, Fla., reported a midday total of 0.69 inches of rain.
Out west, a cold front extended across the Great Basin and the Intermountain West. This system triggered showers and thunderstorms across the upper Intermountain West on Monday. On onshore flow from the Pacific also pushed wet weather across the Pacific Northwest. A ridge of high pressure over the eastern Pacific kept conditions clear across the Southwest.

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Weather Underground National Forecast for Monday, June 16, 2014

By: nationalsummary, 10:14 AM GMT on June 16, 2014

Weather Underground Forecast for Monday, June 16, 2014
A cold frontal boundary will extend from the West Coast to the Intermountain West on Monday, while a separate cold front will stretch from the middle Mississippi Valley to the central Great Lakes.
A cold front will stretch across the middle Mississippi Valley and the central Great Lakes on Monday. A warm, humid air mass will stream northward from the Gulf of Mexico. As this air mass interacts with the aforementioned frontal boundary, widespread rain and thunderstorms will develop across the nation’s midsection. Severe thunderstorms will be possible over eastern Nebraska, eastern South Dakota, 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 chance of flash flooding to southwest Wisconsin, Iowa, southern Minnesota, western Nebraska and western South Dakota. Scattered showers and thunderstorms will also be possible across the Ohio Valley and the middle Mississippi Valley.
High pressure will keep conditions mostly clear across the Mid-Atlantic on Monday. An onshore flow from the Atlantic will initiate isolated showers and thunderstorms over the Southeast, while scattered showers will push across the Northeast.
Out west, a cold front will extend from northern California to Montana. Low pressure along the eastern end of the frontal boundary will trigger scattered showers and thunderstorms across the upper Intermountain West. An onshore flow from the Pacific will also bring rainy weather to the Pacific Northwest on Monday.

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Weather Underground National Forecast for Monday, June 16, 2014

By: nationalsummary, 8:48 AM GMT on June 16, 2014

Weather Underground Forecast for Monday, June 16, 2014
A cold frontal boundary will extend from the West Coast to the Intermountain West on Monday, while a separate cold front will stretch from the middle Mississippi Valley to the central Great Lakes.
A cold front will stretch across the middle Mississippi Valley and the central Great Lakes on Monday. A warm, humid air mass will stream northward from the Gulf of Mexico. As this air mass interacts with the aforementioned frontal boundary, widespread rain and thunderstorms will develop across the nation’s midsection. Severe thunderstorms will be possible over eastern Nebraska, eastern South Dakota, 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 chance of flash flooding to southwest Wisconsin, Iowa, southern Minnesota, western Nebraska and western South Dakota. Scattered showers and thunderstorms will also be possible across the Ohio Valley and the middle Mississippi Valley.
High pressure will keep conditions mostly clear across the Mid-Atlantic on Monday. An onshore flow from the Atlantic will initiate isolated showers and thunderstorms over the Southeast, while scattered showers will push across the Northeast.
Out west, a cold front will extend from northern California to Montana. Low pressure along the eastern end of the frontal boundary will trigger scattered showers and thunderstorms across the upper Intermountain West. An onshore flow from the Pacific will also bring rainy weather to the Pacific Northwest on Monday.

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Weather Underground National Forecast for Monday, June 16, 2014

By: nationalsummary, 8:29 AM GMT on June 16, 2014

Weather Underground Forecast for Monday, June 16, 2014
A cold frontal boundary will extend from the West Coast to the Intermountain West on Monday, while a separate cold front will stretch from the middle Mississippi Valley to the central Great Lakes.
A cold front will stretch across the middle Mississippi Valley and the central Great Lakes on Monday. A warm, humid air mass will stream northward from the Gulf of Mexico. As this air mass interacts with the aforementioned frontal boundary, widespread rain and thunderstorms will develop across the nation’s midsection. Severe thunderstorms will be possible over eastern Nebraska, eastern South Dakota, 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 chance of flash flooding to southwest Wisconsin, Iowa, southern Minnesota, western Nebraska and western South Dakota. Scattered showers and thunderstorms will also be possible across the Ohio Valley and the middle Mississippi Valley.
High pressure will keep conditions mostly clear across the Mid-Atlantic on Monday. An onshore flow from the Atlantic will initiate isolated showers and thunderstorms over the Southeast, while scattered showers will push across the Northeast.
Out west, a cold front will extend from northern California to Montana. Low pressure along the eastern end of the frontal boundary will trigger scattered showers and thunderstorms across the upper Intermountain West. An onshore flow from the Pacific will also bring rainy weather to the Pacific Northwest on Monday.

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Weather Underground National Forecast for Friday, June 13, 2014

By: nationalsummary, 10:59 AM GMT on June 13, 2014

Weather Underground Forecast for Friday, June 13, 2014
A cold frontal boundary will stretch from the West Coast to the Intermountain West on Friday, while a separate cold front will extend from the southern Plains to the eastern Great Lakes.
A cold front will push east southeastward over the northwestern corner of the country. This system will extend from northern California to southeast Montana, and is expected to bring widespread showers and thunderstorms to the Pacific Northwest, the Intermountain West, the Plains and parts of the Midwest. Severe thunderstorms will be possible over southeast Montana, northeast Wyoming, southwest North Dakota and western North Dakota. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. The Desert Southwest will continue to experience warm, dry conditions due to a ridge of high pressure over the eastern Pacific.
A separate cold front will stretch from central Texas, across the lower Mississippi Valley, over the Ohio Valley and into the eastern Great Lakes region. As warm, muggy air from the Gulf of Mexico streams northward ahead of this frontal boundary, rain and thunderstorms will develop across the Gulf Coast, the Southeast, the Mid-Atlantic, the eastern Ohio Valley and the Northeast. Heavy rain associated with these thunderstorms will bring a chance of flash flooding to northern New England on Friday. High pressure will keep conditions clear across much of the southern Plains, the middle Mississippi Valley and the upper Midwest.

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Weather Underground National Recap for Friday, June 13, 2014

By: nationalsummary, 10:59 AM GMT on June 13, 2014

Weather Underground midday recap for Friday, June 13, 2014
A cold frontal boundary extended from the lower Mississippi Valley to the eastern Great Lakes on Friday, while a separate cold front stretched from the Great Basin to the upper Intermountain West.
A cold front extended from the lower Mississippi Valley, across the Tennessee Valley, the Ohio Valley and the eastern Great Lakes on Friday. As warm, humid air streamed northward ahead of this frontal boundary, numerous areas of showers and thunderstorms developed. The strongest storms focused over the eastern Ohio Valley, the Mid-Atlantic and the Northeast, as flash flood warnings were issued in eastern Pennsylvania. Flash flood warnings were also issued across a handful of other states, as Bridgeport, Conn., reported a midday total of 1.39 inches of rain, while Portland, Maine, reported a midday total of 1.26 inches of rain. Isolated showers and thunderstorms developed across portions of the Southeast and the eastern Gulf Coast, as flood advisories were issued in eastern Tennessee. Tampa Macdill Air Force Base, Fla., reported a midday total of 1.95 inches of rain, while Brookhaven, Miss., reported a midday total of 2.09 inches of rain. High pressure kept conditions clear across the Midwest, the central Plains and the southern Plains on Friday.
Meanwhile, a separate cold front stretched from the Great Basin to the upper Intermountain West. A low pressure system along the eastern end of the frontal boundary ushered scattered showers and thunderstorms across the Pacific Northwest and the Intermountain West. Thunderstorms also formed over portions of New Mexico. High pressure brought warm, dry conditions to the Desert Southwest, as Blythe, Calif., recorded a midday high of 105 degrees.

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Weather Underground National Forecast for Friday, June 13, 2014

By: nationalsummary, 6:40 AM GMT on June 13, 2014

Weather Underground Forecast for Friday, June 13, 2014
A cold frontal boundary will stretch from the West Coast to the Intermountain West on Friday, while a separate cold front will extend from the southern Plains to the eastern Great Lakes.
A cold front will push east southeastward over the northwestern corner of the country. This system will extend from northern California to southeast Montana, and is expected to bring widespread showers and thunderstorms to the Pacific Northwest, the Intermountain West, the Plains and parts of the Midwest. Severe thunderstorms will be possible over southeast Montana, northeast Wyoming, southwest North Dakota and western North Dakota. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. The Desert Southwest will continue to experience warm, dry conditions due to a ridge of high pressure over the eastern Pacific.
A separate cold front will stretch from central Texas, across the lower Mississippi Valley, over the Ohio Valley and into the eastern Great Lakes region. As warm, muggy air from the Gulf of Mexico streams northward ahead of this frontal boundary, rain and thunderstorms will develop across the Gulf Coast, the Southeast, the Mid-Atlantic, the eastern Ohio Valley and the Northeast. Heavy rain associated with these thunderstorms will bring a chance of flash flooding to northern New England on Friday. High pressure will keep conditions clear across much of the southern Plains, the middle Mississippi Valley and the upper Midwest.

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Weather Underground National Recap for Thursday, June 12, 2014

By: nationalsummary, 11:38 AM GMT on June 12, 2014

Weather Underground midday recap for Thursday, June 12, 2014
A cold frontal boundary extended from the southern Plains to the upper MIdwest on Thursday, while an area of low pressure pushed across the Mid-Atlantic.
A low pressure system moved eastward over the Mid-Atlantic on Thursday. This system ushered heavy rain and thunderstorms across a handful of states. Flash flood warnings were issued in south central Pennsylvania, while flash flood watches were issued across western and northern Virginia, West Virginia, Maryland, Pennsylvania and New Jersey. Richmond, Va., reported a midday total of 1.39 inches of rain, while Warrenton, Va., reported a midday total of 1.32 inches of rain. An onshore flow from the Atlantic also triggered isolated thunderstorms across parts of the Southeast, while the central Gulf Coast stayed clear of wet weather.
Meanwhile, a cold frontal boundary extended from western Texas, across the middle Mississippi Valley and over the upper Midwest on Thursday. Numerous areas of showers and thunderstorms developed over the southern Plains, the middle Mississippi Valley and the upper Mississippi Valley, as flood advisories were issued in eastern Kansas and western Missouri. International Falls, Minn., reported a midday total of 2.59 inches of rain, while Kansas City, Mo., reported a midday total of 1.39 inches of rain.
Out west, an onshore flow from the Pacific associated with an area of low pressure brought wet weather to eastern Washington and eastern Oregon. The remainder of the West Coast stayed clear of precipitation due to a ridge of high pressure over the eastern Pacific. The Desert Southwest continued to experience warm, dry conditions, as Thermal, Calif., recorded a midday high of 100 degrees on Thursday.

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Weather Underground National Forecast for Thursday, June 12, 2014

By: nationalsummary, 11:38 AM GMT on June 12, 2014

Weather Underground Forecast for Thursday, June 12, 2014
A cold frontal boundary will extend from the southern Plains to the upper Midwest on Thursday, while a low pressure system will move across the Mid-Atlantic.
A cold frontal boundary will move east southeastward over the southern Plains, the middle Mississippi Valley and the upper Midwest on Thursday. As warm, muggy air from the Gulf of Mexico collides with this system, widespread rain and thunderstorms will develop across the region. Severe thunderstorms will be possible over northeast Texas, southeast Oklahoma, northwest Louisiana and southwest Arkansas. These thunderstorms will be capable of producing localized heavy rain, large hail and dangerous straight line winds. As this system shifts eastward, it will bring stormy weather to the Tennessee Valley and the Southeast.
Meanwhile, an area of low pressure will push east northeastward over the Ohio Valley and the Mid-Atlantic. This system will usher rainy and thunderstorms across a handful of states over the northern MId-Atlantic and the Northeast.
A separate low pressure system will drift across the Pacific Northwest and the Intermountain West, During the morning, wet weather will push across Washington, Oregon and Idaho, while afternoon showers and thunderstorms can be expected across parts of the Intermountain West. High pressure over the eastern Pacific will keep conditions warm and dry across the Desert Southwest. Temperatures are forecast to range between the 90s and 100s across the southern California and Arizona deserts on Thursday.

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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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