...Severe weather possible over the north central U.S....
...Flash flooding is a concern for portions of central Appalachians...
...Monsoonal flow continues in the Southwest...
A vigorous shortwave crossing Canada will drop a cold front through the northern tier of the Nation early this week. Strong to severe storms will be possible with the passing front...which should push through the Northern Plains Sunday night and into the Upper Midwest and Central Plains by Monday (for the latest information on severe weather...please refer to the Storm Prediction Center). In addition... the front will bring another shot of cooler Canadian air into the north central U.S. for the start of the work week.
Numerous showers and thunderstorms will continue to break out along and to the south of a frontal boundary stretched through the Ohio Valley and Mid-Atlantic states. Much of the convection from the Gulf Coast to the Great Lakes will be scattered in nature... however...pieces of energy rotating through the large scale flow aloft should help produce some more organized areas of storms. Also...given the amount of moisture available...even an isolated storm will have the potential to produce heavy rains. The greatest threat for any flash flooding will be along portions of the central Appalachians.
Monsoonal moisture and a weak upper low moving northward away from the Baja peninsula will trigger showers and thunderstorms across much of the Southwest and into portions of Southern California and the central Great Basin...especially during the late afternoon and early evening hours.
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