ABC News: U.S.: The Nation's Weather

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The Nation's Weather Jul 1st 2012, 09:54 A heat wave will continue for the Eastern Valleys, while scattered showers and thunderstorms are expected to develop Sunday from the Northern Plains th rough the Midwest. A cold front over the Ohio River Valley and Northeast will slowly pull southeastward. This will allow for widespread showers and thunderstorms to spread from the Ohio River Valley through the Mid-Atlantic states. There is a slight chance that these storms will turn severe with strong winds and large hail. Behind this system, another low pressure system is moving away from the northern Rockies and into the northern Plains. This will produce a warm front that extends eastward, kicking up scattered showers and thunderstorms across the Dakotas and upper Midwest. Just ahead of this system, a smaller trough of low pressure will move across the Midwest, triggerin g widespread thunderstorm activity. AP This NOAA satellite image taken Sunday, July... View Full Caption This NOAA satellite image taken Sunday, July 01, 2012 at 1:45 a.m. EDT shows clouds develop over the Central US, as a low pressure system moves off the Rockies and into the Plains. This allows for scattered showers and thunderstorms to spread from the Plains and into the Midwest. Some of these storms turn severe with large hail and strong winds. Meanwhile to the south, an area of low pressure over the western Gulf of Mexico maintains storms across eastern Texas. At the same time, hot temperatures will continue from the Mississippi River Valley through the Eastern Seaboard. (AP PHOTO/WEATHER UNDERGROUND) Close In the Southeast, a high pressure ridge over the Gulf states will continue pushing warm and humid air in from the Gulf of Mexico. This will maintain high temperatures, with excessive heat warnings and heat advisories stretching from the Mississippi River Valley through the Eastern Seaboard. Some areas will see highs in the lower 100s again. In the West, a trough of low pressure will move from the Pacific Northwest, over the intermountain West, and into the northern Rockies. This will kick up scattered showers and thunderstorms throughout the day. To the south, monsoonal moisture over the central and southern Rockies will increase chances for showers and thunderstorms. Temperatures in the lower 48 states ranged Saturday from a morning low of 30 degrees at Stanley, Idaho to a high of 109 degrees at Smyrna, Tenn. ——— Online: Weather Underground: http://www.wunderground.com National Weather Service: http://iwin.nws.noaa.gov Intellicast: http://www.intellicast.com

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