887
FXUS01 KWBC 130807
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
407 AM EDT SUN SEP 13 2026
VALID 12Z SUN SEP 13 2026 - 12Z TUE SEP 15 2026
...SHOWERS AND THUNDERSTORMS CONTINUE ACROSS THE CENTRAL AND
EASTERN U.S. AHEAD OF A WELL-DEFINED FRONT TODAY...
...DEVELOPING LOW PRESSURE SYSTEM WILL DRIVE WET AND COOL WEATHER
ACROSS THE NORTHWEST AND NORTHERN ROCKIES, AND REINFORCE UNSETTLED
WEATHER IN THE PLAINS...
OVER THE 24 HOURS, A ROBUST UPPER-TROUGH OVER THE UPPER
MIDWEST/GREAT LAKES WILL PUSH THE LEADING EDGE OF A WELL-DEFINED
COLD TOWARDS THE EASTERN SEABOARD, WHILE THE TRAILING PORTION OF
THE FRONT BEGINS TO RETURN NORTHWARD THROUGH THE CENTRAL PLAINS.
THIS PATTERN WILL SET THE STAGE FOR MORE STORMY WEATHER FROM THE
NORTHEAST TO THE CENTRAL PLAINS TODAY, WITH ISOLATED TO SCATTERED
HEAVY RAINFALL AND SEVERE WEATHER POSSIBLE THIS MORNING AND LATER
THIS AFTERNOON. BY TOMORROW, THE COLD FRONT IS EXPECTED TO EXIT
INTO THE WESTERN ATLANTIC, LEADING TO IMPROVED WEATHER FOR MUCH OF
THE EAST. FOR THE WESTERN AND CENTRAL U.S., HOWEVER, A
CONSOLIDATING LOW PRESSURE SYSTEM IN THE NORTHWEST WILL MAINTAIN
UNSETTLED CONDITIONS FOR THE NEXT SEVERAL DAYS, ESPECIALLY OVER
THE PLAINS STATES NEAR A SLOW MOVING WARM FRONT. WHILE SOME OF THE
PRECIPITATION FROM THIS DEVELOPING SYSTEM COULD BE BENEFICIAL
(SUCH AS IN THE NORTHWEST TODAY), DAILY ROUNDS OF THUNDERSTORMS IN
THE HEARTLAND WILL PROMOTE AN ENHANCED THREAT OF HEAVY RAINFALL
AND FLASH FLOODING WHERE THESE STORMS REPEAT. MEANWHILE, MONSOON
THUNDERSTORMS ARE EXPECTED TO PERSIST ACROSS THE SOUTHERN ROCKIES
AND FOUR CORNERS, WITH AN ATTENDANT THREAT OF ISOLATED EXCESSIVE
RAINFALL.
RAINFALL ASIDE, THE FRONTAL PASSAGE(S) SHOULD USHER IN PLEASANT
DAYTIME TEMPERATURES OVER PORTIONS OF THE NORTHERN TIER, GREAT
BASIN, AND HIGH PLAINS WITH HIGHS IN THE LOW-MID 60S AND 70S.
UNFORTUNATELY, THE UPPER-RIDGE WILL PERSIST FOR PORTIONS OF THE
SOUTHERN PLAINS AND MID-MISSISSIPPI VALLEY, WITH THE POTENTIAL FOR
RECORD-BREAKING HEAT EXPECTED WELL INTO THE WORK WEEK.
ASHERMAN/OUDIT
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