Prognostic Meteorological Discussion
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FXUS01 KWBC 180759
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
358 AM EDT FRI AUG 18 2017

VALID 12Z FRI AUG 18 2017 - 12Z SUN AUG 20 2017

...SLIGHT RISKS OF SEVERE THUNDERSTORMS AND FLASH FLOODING FOR THE
MID-ATLANTIC ON FRIDAY...

...HEAVY RAIN AND FLASH FLOODING POSSIBLE OVER PARTS OF THE
SOUTHWEST ON SATURDAY...

A SURFACE LOW PRESSURE SYSTEM LOCATED OVER THE UPPER GREAT LAKES
IS EXPECTED TO TRACK NORTHEASTWARD INTO SOUTHERN CANADA OVER THE
NEXT COUPLE OF DAYS. AS IT MOVES, ITS ASSOCIATED COLD FRONT WILL
PROGRESS EASTWARD THROUGH THE OHIO VALLEY AND INTO THE NORTHEAST
AND MID-ATLANTIC ON FRIDAY. ALONG AND AHEAD OF THIS FRONT,
WIDESPREAD SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE FOR MUCH OF
THE EASTERN U.S. THERE IS A SLIGHT RISK OF SEVERE WEATHER AS WELL
AS A SLIGHT RISK FOR EXCESSIVE RAINFALL/FLASH FLOODING FOR
PORTIONS OF THE MID-ATLANTIC ON FRIDAY. ANOTHER SURFACE LOW
PRESSURE SYSTEM LOCATED IN THE CENTRAL PLAINS WILL LEAD TO
SCATTERED SHOWERS AND THUNDERSTORMS FOR PORTIONS OF THE PLAINS
FRIDAY AND INTO THE MISSISSIPPI VALLEY BY FRIDAY EVENING. HEAVY
RAIN AND SOME FLASH FLOODING IS POSSIBLE, PARTICULARLY IN PORTIONS
OF THE SOUTHERN PLAINS.

ON SATURDAY, AN UPPER-LEVEL LOW WILL MOVE INTO THE SOUTHWESTERN
U.S. THIS WILL LEAD TO SHOWERS AND THUNDERSTORMS FOR PORTIONS OF
THE SOUTHWEST, SOUTHERN AND CENTRAL ROCKIES, AND SOUTHERN AND
CENTRAL HIGH PLAINS ON SATURDAY. BY SATURDAY NIGHT, RAIN AND
THUNDERSTORMS WILL BECOME MORE WIDESPREAD. SOME STORMS COULD
CONTAIN HEAVY RAIN, AND FLASH FLOODING IS A POSSIBILITY,
PARTICULARLY FOR PARTS OF NEW MEXICO, WHERE THERE IS A SLIGHT RISK
OF FLASH FLOODING.

TATE



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