The nation's weather

AP News
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Posted: May 23, 2011 6:40 AM
The nation's weather

The storm system that brought active weather to the Northern Plains during the past few days will lift northeastward through Wisconsin toward southern Ontario, Canada, on Monday.

As it exits, precipitation in the Northern Plains will taper off, while showers linger in Minnesota. Ahead of this system, scattered showers, periods of heavy rain and thunderstorms will develop from the Great Lakes through the Southern Plains and eastward into parts of the Mid-Atlantic and the Northeast. Areas of Wisconsin, Illinois and Indiana will see the heaviest rain showers. Meanwhile, moist and moderate to strong unstable atmospheric conditions ahead of this system and fronts will create a moderate risk of severe storms in central and northern Oklahoma. Areas from the Central and Southern Plains northeastward into Mid-Mississippi, Tennessee and Ohio Valleys and the Lower Great Lakes are at slight risk of severe thunderstorms. Severe thunderstorms in these regions may come with damaging wind, large hail, and a few tornadoes in distinct storms.

In the West, a cold trough of low pressure will stir up showers and isolated thunderstorms in parts of the Pacific Northwest, Idaho, Nevada and Utah as it lingers over the Intermountain West.

Temperatures in the Lower 48 states Sunday ranged from a morning low of 26 degrees at Yellowstone, Wyo., to a high of 99 degrees at Laredo, Texas.