This is the blog for the United States' national forecast. These summaries are by Weather Underground forecasters and are updated twice each day.
By: nationalsummary , 7:58 AM GMT on May 15, 2014
Weather Underground Forecast for Thursday, May 15, 2014
Heavy rain and thunderstorms will shift slowly eastward over the East Coast on Thursday, while a ridge of high pressure will continue to linger over the West Coast.
An active weather system will continue to impact the eastern third of the country on Thursday. A cold frontal boundary will extend from the eastern Gulf Coast to the eastern Great Lakes. As this system interact with a warm, muggy air mass over the Eastern Seaboard, widespread rain and thunderstorms will develop across a handful of states. Strong thunderstorms are expected to push across the Southeast, the Mid-Atlantic, the eastern Tennessee Valley and the Ohio Valley. These thunderstorms will be capable of producing damaging straight-line winds and large hail. Heavy rain associated with these thunderstorms could lead to flash flooding over the Carolinas, Virginia, West Virginia, Maryland, Pennsylvania and New York. Scattered showers will also be possible across the Mississippi Valley and the upper Midwest, while the majority of the Plains will stay clear of wet weather.
Meanwhile, a cold frontal boundary will extend southward across the Intermountain West and the southern Plains. This system will usher rainy weather across the lower elevations of the Intermountain West, while high elevation snow showers will be possible across the Rockies. Just to the west, a ridge of high pressure will continue to dominate the West Coast, as warm, dry conditions will linger across the region. Temperatures are expected to range between the 90s and 100s across California on Thursday.
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