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Associated Press

Posted on April 11, 2014 at 5:05 AM

Updated Friday, Apr 11 at 5:07 AM

Weather Underground Forecast for Friday, April 11, 2014

A cold frontal boundary will extend from the southern Plains to New England on Friday, while a wave of low pressure will skim across the Pacific Northwest.

A cold frontal boundary will propagate eastward across the central and eastern thirds of the country. This frontal boundary is forecast to stretch from Texas to Maine on Friday, as showers and thunderstorms will develop over a handful of states. The strongest storms will focus over the Ohio Valley and into the Mid-Atlantic, bringing a chance of flash floods to southern Ohio, northwestern Kentucky, West Virginia, Maryland and eastern Pennsylvania. Showers and thunderstorms are also expected across the Mississippi Valley and the Tennessee Valley. Most of the Gulf Coast will stay clear of wet weather due to high pressure over the Gulf of Mexico, while an onshore flow from the Atlantic will trigger thunderstorm development over Florida.

Meanwhile, a separate frontal boundary will dip southward over the northern Plains and the upper Midwest. Scattered showers will be possible across North Dakota, Minnesota and Wisconsin during the day while heavier rain is expected to move across the region during the evening. Just to the west, a low pressure system will shift across the border between Washington and British Columbia. This system will bring a chance of rain to northern Washington, northern Idaho and northern Montana.

Conditions will stay mostly clear across the Southwest, the Great Basin and the Intermountain West on Friday due to a ridge of high pressure along the eastern Pacific. .

Temperatures in the Lower 48 states Thursday have ranged from a morning low of 6 degrees at Mt. Washington, N.H. to a high of 91 degrees at Palm Springs, Calif.

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