552
FXUS01 KWBC 111933
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
332 PM EDT MON SEP 11 2023
VALID 00Z TUE SEP 12 2023 - 00Z THU SEP 14 2023
...ACTIVE SHOWERS AND THUNDERSTORMS EXPECTED TO STRETCH FROM THE
SOUTHWEST, SOUTHERN PLAINS INTO THE MID MISSISSIPPI VALLEY, GREAT
LAKES AND NORTHEAST...
...BELOW AVERAGE TEMPERATURES TO CONTINUE TO PRESS EASTWARD FROM
THE MID SECTION OF THE NATION INTO THE EAST...
...THE RECENT STRETCH OF RECORD HIGHS ACROSS THE SOUTHERN PLAINS
HAS COME TO AN END...
THE LARGE SCALE FLOW ACROSS THE LOWER 48 WILL BE DOMINATED BY AN
AMPLIFYING MID TO UPPER LEVEL TROF MOVING FROM THE UPPER
MISSISSIPPI VALLEY INTO THE UPPER GREAT LAKES MONDAY NIGHT INTO
TUESDAY AND EASTWARD INTO THE LOWER LAKES, OHIO VALLEY AND
MID-ATLANTIC ON WEDNESDAY. THIS UPPER TROF WILL BE PUSHING A
STRONG FRONTAL BOUNDARY EASTWARD OVER THE NEXT FEW DAYS AND
SUPPORT THE POTENTIAL FOR ACTIVE SHOWERS AND THUNDERSTORMS ALONG
THE LENGTH OF THE FRONT FROM PORTIONS OF THE SOUTHWEST, THE
SOUTHERN PLAINS, INTO THE MID MISSISSIPPI VALLEY, GREAT LAKES AND
NORTHEAST. LOCALLY HEAVY RAINS ARE POSSIBLE ALONG AND AHEAD OF
THIS FRONTAL BOUNDARY ACROSS THESE REGIONS, WITH ISOLATED FLASH
FLOODING POSSIBLE. THIS MAY BE ESPECIALLY SO ACROSS PORTIONS OF
THE SOUTHERN PLAINS INTO PORTIONS OF THE SOUTHWEST WHERE THE
FRONTAL BOUNDARY WILL BE VERY SLOW MOVING AND WILL HELP TO FOCUS
THE HEAVY PRECIPITATION THREAT FOR A LONGER PERIOD OF TIME. WHILE
THE FRONT IS EXPECTED TO BE MORE PROGRESSIVE FOR REGIONS TO THE
NORTHEAST OF THE SOUTHERN PLAINS AND SOUTHWEST, THERE HAVE BEEN
RECENT HEAVY RAINS OVER THE PAST WEEK FROM THE SOUTHERN TO CENTRAL
APPALACHIANS INTO THE MID-ATLANTIC AND NORTHEAST, WITH ADDITIONAL
HEAVY RAIN POTENTIAL POSSIBLY PRODUCING LOCALIZED FLASH FLOODING.
IN THE WAKE OF THE ABOVE MENTIONED STRONG FRONT, BELOW AVERAGE
TEMPERATURES ARE OCCURRING FROM PORTIONS OF THE SOUTHERN PLAINS,
NORTH THROUGH THE CENTRAL AND NORTHERN PLAINS AND INTO THE UPPER
MISSISSIPPI VALLEY. THESE BELOW AVERAGE TEMPERATURES ARE EXPECTED
TO CONTINUE TO PUSH EASTWARD OVER THE NEXT FEW DAYS INTO THE GREAT
LAKES, OHIO VALLEY AND MID MISSISSIPPI VALLEY REGION ON TUESDAY
AND THEN INTO THE OHIO VALLEY, TENNESSEE VALLEY, SOUTHERN TO
CENTRAL APPALACHIANS AND MID-ATLANTIC BY WEDNESDAY. ABOVE
AVERAGE TEMPERATURES ARE STILL EXPECTED FROM SOUTH TEXAS, EASTWARD
ALONG THE GULF COAST AND INTO FLORIDA OVER THE NEXT FEW DAYS.
HOWEVER, THESE TEMPERATURES WILL NOT BE AS HOT AS THE PAST WEEKS
TEMPERATURES AND WILL BRING AN END TO THE RECENT STRING OF
WIDESPREAD RECORD HIGH TEMPERATURES ACROSS THE SOUTHERN PLAINS.
ORAVEC
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