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Associated Press

Posted on May 28, 2014 at 4:03 AM

Updated Thursday, May 29 at 3:38 AM

Weather Underground Forecast for Thursday, May 29, 2014

A cold frontal boundary will extend from the middle Mississippi Valley to the Mid-Atlantic on Thursday, while a low pressure system will inch across the Gulf Coast.

An area of low pressure will continue to slide eastward across the central Gulf Coast on Thursday. This system will draw warm, muggy air from the Gulf of Mexico, which will initiate strong thunderstorms over the central and eastern Gulf Coast. Heavy rain associated with these thunderstorms could lead to flash flooding over southeast Louisiana, southern Mississippi, southern Alabama and the western tip of the Florida Panhandle. Meanwhile, a cold front will extend from the middle Mississippi Valley to the Carolinas. As warm, humid air collides with this frontal boundary, showers and thunderstorms will develop over the Mississippi Valley, the Tennessee Valley and the Mid-Atlantic. Rainy weather will also be possible over parts of the Northeast. The upper Midwest and the Great Lakes will avoid precipitation due to high pressure over the region.

A separate cold front will stretch from the Great Basin to the northern Plains. Strong thunderstorms can be expected over the northern Rockies and the northern Plains, while isolated showers and thunderstorms will be possible across central Rockies and the Four Corners.

Out west, an onshore flow from the Pacific will bring light rain to portions of Washington and northwest Oregon. A ridge of high pressure will keep the remainder of the West Coast clear of wet weather. Temperatures are forecast to range between the 90s and 100s across the Desert Southwest on Thursday.

Temperatures in the Lower 48 states Wednesday have ranged from a morning low of 28 degrees at West Yellowstone, Mont. to a high of 99 degrees at Needles, Calif.

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