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[May 09, 2011] (AP) Cool and windy weather will continue throughout much of the West on Monday as a trough of low pressure over the Pacific Northwest digs across the region.

Moisture accompanying the trough will trigger scattered rain showers and high-elevation snow in the Pacific Northwest and Intermountain West. Meanwhile, a colder air mass will linger over much of the West, leading to another day of chilly, below-average daytime highs and lower snow levels. To the south, strengthening winds will continue to sweep through the Southwest. Very low humidity levels, above-normal temperatures and windy weather conditions will enhance critical fire weather conditions throughout the region.

Ahead of the trough of low pressure moving through the West, increased instability in the upper Midwest will create a slight risk of severe thunderstorms in the northern Plains, southeastern Iowa and Illinois. The main concerns with these storms will be large hail, damaging wind, and perhaps tornadoes. Residents in these areas are encouraged to monitor their local weather conditions through the day.

Finally, calmer conditions and milder daytime highs will prevail in the east as high pressure gradually builds over the region. Only a few showers will be possible in the Carolinas as a wave of low pressure exits the coast.

Temperatures in the Lower 48 states Sunday ranged from a morning low of 26 degrees at Gunnison, Colo., to a high of 105 degrees at Altus, Okla.

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[Associated Press article from Weather Underground]