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Weather Underground Forecast for Friday, August 29, 2014

An area of low pressure will move across the upper Mississippi Valley on Friday, while a tropical disturbance will linger over the Gulf of Mexico.

A strong low pressure system is forecast to shift northeastward over the upper Mississippi Valley on Friday. As this system interacts with warm, humid air across the nation’s midsection, strong thunderstorms will develop over the upper Midwest. These thunderstorms will bring heavy rain to several states, which could lead to flash flooding over northeast Iowa, southeast Minnesota, Wisconsin and northwest Michigan. A cold frontal boundary associated with this system will extend southward across the central and southern Plains. Showers and thunderstorms are also expected to develop along this frontal boundary. Meanwhile, a tropical disturbance over the northwestern corner of the Gulf of Mexico will push stormy weather across the western and central portions of the Gulf Coast, while sea breeze induced thunderstorms are expected over Florida. Just to the north, scattered showers will be possible over the Mid-Atlantic. High pressure will keep conditions clear across the Northeast.

Daytime heating and monsoonal moisture will trigger isolated thunderstorms over the central and northern Rockies during Friday afternoon and evening. Additionally, a cold front will begin to move across the Northwest, bringing a chance of rain to Oregon and Washington. A ridge of high pressure over the eastern Pacific will keep the remainder of the West Coast mostly clear of precipitation.

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