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 The Pacific trough of low pressure and cold front will move inland across the northwestern quadrant of the nation, spreading rain showers, high elevation snow, and significantly cooler temperatures to areas from northern California and the Pacific Northwest through the Northern Rockies. To the south, the southern California storm will move into Arizona on Thursday, resulting in a good chance of light to moderate precipitation, local gusty winds and cooler temperatures from parts of inland southern California through portions of the Southwest and Central Great Basin. This system will advance northeastward into Colorado/New Mexico Thursday night, and will create a slight risk of severe weather in the Central and Southern High Plains overnight. The main concerns with these storms will be large hail and possible tornadoes.
To the east of this activity, temperatures across the Plains will remain warm to hot as high pressure remains the dominant weather feature of the region. Record temperatures may be possible across the Southern Plains as highs climb into the 90s to near 100 degrees. Warmer weather is also anticipated in the Southeast as temperatures reach into the mid-80s to near 90.
To the north, low pressure in the Midwest will move eastward through the Ohio Valley on Thursday while it's associated warm front extends into the Mid-Atlantic and it's associated cold front trails southwestward into the Southern Plains. Showers and thunderstorms will accompany these disturbances in parts of Michigan, the Ohio and Tennessee
valleys and the Mid-Atlantic.
Temperatures in the Lower 48 states Wednesday ranged from a morning low of 19 degrees at
Mount Washington, N.H., to a high of 102 degrees at Wink, Texas
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