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 08, 2014
Weather Underground Forecast for Saturday, August 09, 2014
An area of low pressure will move across the Tennessee Valley on Saturday, while a separate low pressure system will inch across the northern Plains.
A low pressure system will trek east southeastward over the Tennessee Valley on Saturday. As this system draws warm, muggy air from the Gulf of Mexico, strong to severe thunderstorms will develop over the Ohio Valley, the Tennessee Valley, the central and eastern Gulf Coast, the Southeast and the Mid-Atlantic. Due to how slow this system is expected to move, flash flood will be possible over several states, including parts of Tennessee, Alabama, Georgia and the Carolinas. Scattered showers will also linger over of the Northeast as an area of low pressure drifts northeastward over southeast Canada.
Meanwhile, a separate low pressure system will inch across the northern Plains on Saturday. This system will interact with warm, humid air draped across the nations midsection. Showers and thunderstorms will be possible over the Dakotas, Nebraska, southwest Minnesota, western Iowa and northern Kansas. The heaviest rain will likely affect southeast Nebraska, northern Kansas and southwest Minnesota.
Scattered showers and isolated thunderstorms will also develop over the Intermountain West and the Great Basin as monsoonal moisture lingers over the region. The majority of the West Coast will stay mostly clear of precipitation due to a ridge of high pressure over the eastern Pacific.
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