Strong thunderstorms will fire up from the Mississippi Valley to the East Coast on Tuesday, while a frontal system impacts the upper Intermountain West.
A low pressure system will lose organization as it drifts eastward across the Plains and the Mississippi Valley. This system will continue to draw warm and moist air from the Gulf of Mexico, which will set the stage for strong to severe thunderstorms. Strong complexes of thunderstorms will fire up across the southern Plains, the central Plains, the Mississippi Valley, the Tennessee Valley, the Ohio Valley and the Mid-Atlantic. Severe thunderstorms will be possible in southern Texas, northeast Arkansas, southeast Missouri, southern Illinois, southern Indiana, Kentucky and Tennessee. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. Most of the Northeast and the Southeast will stay clear of precipitation.
Meanwhile, a cold frontal boundary will stretch across the northern Plains and the Intermountain West. A well-defined low pressure system form over the northern high Plains, which will bring moderate to heavy precipitation to the upper Intermountain West and the northern Plains. High elevation snow will impact the northern Rockies, and flash flooding will be possible in eastern Montana. Winter storm warnings and winter weather advisories are in place for central and western Montana.
A ridge of high pressure over the eastern Pacific will keep the West Coast dry on Tuesday.
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