US Short Term Forecast to Jul 23

...Heat and humidity make a return to the central U.S. early this week...

...Flash flooding and severe thunderstorms possible across the Northern Plains and Upper Mississippi Valley...

...Wet and stormy conditions will continue over the Southeastern U.S....

Temperatures and dewpoints will be on the rise beneath an upper ridge building in the Central U.S. early this week. Heat advisories have been issued for portions of the Midwest where heat indices could climb into triple digits.

To the north of the expanding ridge...a cold front will begin to drop south / southeastward through the northern tier of the Nation. The front will trigger showers and thunderstorms while moving through the Northern Plains late Monday and crossing into the Upper Mississippi Valley on Tuesday. These developing storms will be tapping into a warm and unstable airmass setting up over the central them the chance to become organized and potentially pose a threat for flash flooding and severe weather.

Scattered showers and thunderstorms will be possible with the tail end of the boundary while it settles southward through the northern Great Basin and Rockies.

Wet and stormy conditions will persist across the Southeast and up into the Central Appalachians Monday into Tuesday...beneath an elongated upper trough stretched over the Eastern U.S.. Much of the shower and thunderstorm activity should be scattered in nature; but... a lingering frontal boundary...combined with a rich moisture supply... could lead to organized areas of heavy rains along the Central Gulf Coast...across Florida...and over parts of Georgia and South Carolina.

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