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Associated Press

Posted on April 2, 2014 at 3:34 AM

Updated Wednesday, Apr 2 at 3:36 AM

Weather Underground Forecast for Wednesday, April 02, 2014

A cold frontal boundary will extend from the southern Plains to the Northeast on Wednesday, while a low pressure system is expected to shift across the Intermountain West.

A cold frontal boundary will stretch across the southern Plains, the Missisippi Valley, the Tennessee Valley and the Mid-Atlantic on Wednesday. A warm, muggy air mass will push northward from the Gulf of Mexico, which will trigger widespread showers and thunderstorms from the southern Plains to the Ohio Valley. Severe thunderstorms will also be possible across a handful of states, including northeastern Texas, Oklahoma, eastern Kansas, Arkansas, Missouri and southern Illinois. Heavy rain will bring a chance of flash floods to parts of the Midwest. Meanwhile, high pressure along the east coast of Florida will keep conditions mostly clear across the Southeast on Wednesday.

Meanwhile, a wave of low pressure will push eastward across the western half of the country. This system will start off by bringing scattered showers and thunderstorms to the Desert Southwest, as well as high elevation snow showers to the southern Sierra Nevadas and parts of the Great Basin. As this system shifts eastward, heavy snow showers will be possible across the Rockies and parts of the northern and central Plains. The Pacific Northwest will stay mostly clear of precipitation on Wednesday.

Temperatures in the Lower 48 states Tuesday have ranged from a morning low of -9 degrees at Hazen, N.D. to a high of 86 degrees at Laredo, Texas

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