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 , 10:12 PM GMT on August 14, 2014
Weather Underground Forecast for Friday, August 15, 2014
A cold front will dip southward over the northern tier of the country on Friday, while rainy weather wind down over the Northeast.
A cold front will begin to move south southeastward over the northern Plains and the upper Mississippi Valley on Friday. As this system interacts with warm, muggy air from the Gulf of Mexico, strong to severe thunderstorms will develop across the north central portion of the country. Heavy rain associated with these thunderstorms will bring a chance of flash flooding to northern Montana, southwest North Dakota and South Dakota. Additionally, isolated thunderstorms will be possible across the central Plains, the middle Mississippi Valley and the upper Mississippi Valley. Just to the south, monsoonal moisture will fuel scattered showers and thunderstorms across the Four Corners. Flash flooding will be possible across valleys adjacent to sloped terrain. Showers and thunderstorms will also linger over the Pacific Northwest and the upper Intermountain West. High pressure will keep the majority of the Desert Southwest mostly clear of precipitation.
Meanwhile, an area of low pressure will continue to drift northeastward over southeast Canada. Showers will will trail this system over parts of the Northeast, while high pressure will keep conditions dry across the Ohio Valley and the Mid-Atlantic. The tail end of a frontal boundary will linger over the Southeast, which will aid in producing rain and thunderstorms over Florida, southern Georgia and the eastern Gulf Coast.
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