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[May 20, 2010] (AP) Severe weather was forecast to continue sweeping through the southern U.S. on Thursday, triggered by a strong low pressure system.

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T Hardware his system would create two frontal boundaries over the region. A warm front would extend eastward over the lower Mississippi River valley and into the Southeastern states, while a cold front would follow the system tracking through the southern Plains. Just ahead of these fronts were expected to be favorable conditions for scattered thunderstorm development, as ample moisture fed the system from the Gulf of Mexico. This system had a history of producing severe weather with periods of heavy downpours, damaging winds, large hail and tornadoes. If severe weather developed, it would most likely be contained to the lower and mid-Mississippi River valleys, forecasters said. This would kick up some widespread showers that would stretch over the central and northern Plains, into the upper Midwest.

In the East, the low would start shoving a dominating high pressure system eastward and into the Northeast. This would allow for warm conditions to stretch from the Midwest up the Ohio River Valley, into New England and the Northeast. Highs were expected to reach into the 70s in these areas.

In the West, another low pressure system that brought light rain to the Pacific Northwest and northern California would slowly move into the northern Rockies. This would kick up light and scattered snow showers, while light rain persisted in the Pacific Northwest. Another cool and windy day was expected over the West Coast.

Temperatures in the Lower 48 states Wednesday ranged from a low of 26 degrees at Grand Canyon, Ariz., to a high of 96 degrees at Pecos, Texas.

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On the Net:

Weather Underground: http://www.wunderground.com/

National Weather Service:
http://iwin.nws.noaa.gov/

Intellicast:
http://www.intellicast.com/

[Associated Press article from Weather Underground]