Prognostic Meteorological Discussion
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FXUS01 KWBC 212000

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
400 PM EDT Sat Apr 21 2018

Valid 00Z Sun Apr 22 2018 - 00Z Tue Apr 24 2018

...Storm system to bring threats for heavy rain, flash flooding
and possible severe storms from eastern Texas/Oklahoma to the
Southeast U.S...

...Accumulating snow expected for portions of southern Montana
into northwestern Wyoming Sunday night through Monday...

An upper level storm system will move through the central and
southern Plains this evening, across the lower Mississippi River
valley on Sunday and reach the Southeast for Monday. The coverage
of thunderstorms is expected to increase this evening over Texas,
some of which may be severe across northern Texas into Louisiana,
also while posing a threat for heavy rainfall and possible flash
flooding. As the storm system`s cold front moves east for Sunday,
the threats for severe storms and flash flooding will shift
primarily east of the Mississippi River into Gulf Coast States. As
the system slows down into Monday however, higher chances for
heavy rain and flash flooding will exist. The focus will be from
portions of Georgia into the southern Appalachians into most of
South Carolina where a broad 2-4 inches, locally higher, can be
expected through Monday evening. High temperatures in the wake of
the storm system will be a good 5 to 15 degrees cooler than
average for late April.

The only other significant weather maker across the lower 48 will
be in the vicinity of the northern Rockies ahead of an upper level
trough, forecast to enter the Pacific Northwest on Sunday. Expect
rain and higher elevation snow to develop from Idaho into western
Montana by Sunday evening, followed by cooling temperatures and a
changeover to snow for most of the northern Rockies by Monday
morning. Outside of the higher elevations, a few inches of snow
are expected but with rainfall to possibly mix in at time during
the day on Monday, with localized wet snow into the northern High


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