940
FXUS01 KWBC 200701
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
259 AM EDT SAT SEP 20 2025
VALID 12Z SAT SEP 20 2025 - 12Z MON SEP 22 2025
...SCATTERED TO WIDESPREAD STORMS CONTINUE INTO THE WEEKEND FROM
THE MIDWEST TO THE CENTRAL/SOUTHERN PLAINS WITH ISOLATED FLASH
FLOODING POSSIBLE...
...ABOVE AVERAGE TEMPERATURES FOR THE LAST WEEKEND OF SUMMER
ACROSS MUCH OF THE EASTERN AND SOUTHERN U.S...
...SCATTERED STORMS RETURN TO THE SOUTHWEST SUNDAY WITH AN
ISOLATED RISK OF FLASH FLOODING...
A SLOW-MOVING UPPER-LEVEL TROUGH AND ASSOCIATED SURFACE FRONTAL
BOUNDARIES WILL CONTINUE TO HELP SUPPORT SCATTERED TO WIDESPREAD
SHOWERS AND THUNDERSTORMS ACROSS MUCH OF THE MIDWEST AND
CENTRAL/SOUTHERN PLAINS THIS WEEKEND. UPPER-LEVEL SHORTWAVES
ROUNDING THE TROUGH WILL LEAD TO MULTIPLE ROUNDS OF STORMS, WITH
MOISTURE SUPPORTIVE OF MODERATE TO LOCALLY HEAVY RAINFALL. THE
GREATEST CONCENTRATION OF STORMS/HEAVY RAINFALL AND A RISK FOR
ISOLATED FLASH FLOODING IS EXPECTED OVER EASTERN
WISCONSIN/NORTHERN ILLINOIS AND FROM PORTIONS OF THE OZARKS
SOUTHWEST THROUGH CENTRAL/SOUTHWESTERN OKLAHOMA SATURDAY, AND THE
MIDDLE MISSISSIPPI VALLEY WEST INTO EASTERN KANSAS/NORTHEASTERN
OKLAHOMA SUNDAY. ADDITIONAL MORE SCATTERED STORMS ARE FORECAST
AHEAD OF THE UPPER-TROUGH ACROSS THE APPALACHIANS, SOUTHEAST, AND
GULF COAST. AN UPPER-LEVEL SHORTWAVE IS EXPECTED TO BRING MORE
WIDESPREAD STORMS TO PORTIONS OF THE CENTRAL APPALACHIANS IN WEST
VIRGINIA SATURDAY, WITH ISOLATED FLASH FLOODING POSSIBLE HERE AS
WELL. TO THE WEST, A LINGERING UPPER-WAVE WILL BRING SOME WIDELY
SCATTERED STORMS TO PORTIONS OF THE GREAT BASIN, CENTRAL/SOUTHERN
ROCKIES, AND THE SOUTHWEST ON SATURDAY. THEN, ON SUNDAY, ANOTHER
UPPER-TROUGH APPROACHING FROM THE PACIFIC WILL BRING A RETURN OF
INCREASED MONSOONAL MOISTURE INTO THE SOUTHWEST, WITH SCATTERED
THUNDERSTORMS AND THE RISK OF ISOLATED FLASH FLOODING,
PARTICULARLY ACROSS ARIZONA. FURTHER NORTH, ANOTHER PACIFIC SYSTEM
MOVING INTO THE PACIFIC NORTHWEST WITH BRING INCREASING SHOWERS
AND SOME THUNDERSTORMS TO THE PACIFIC NORTHWEST SATURDAY AND INTO
THE NORTHERN ROCKIES SUNDAY.
MUCH OF THE EASTERN AND SOUTHERN U.S. WILL CONTINUE TO SEE ABOVE
AVERAGE AND HOT TEMPERATURES FOR THE LAST WEEKEND OF THE SUMMER.
HIGHS IN THE UPPER-80S TO MID-90S WILL BE COMMON ACROSS THE
OHIO/TENNESSEE AND MIDDLE/LOWER MISSISSIPPI VALLEYS, THE
SOUTHEAST, AND THE SOUTHERN PLAINS/TEXAS. HIGHS WILL BE COOLER AND
AROUND OR BELOW AVERAGE NORTH OF FRONTAL BOUNDARIES ACROSS THE
NORTHERN/CENTRAL PLAINS, UPPER GREAT LAKES, AND THE INTERIOR
NORTHEAST/NEW ENGLAND, WITH HIGHS IN THE 60S AND 70S. ANOTHER
ROUND OF LOWS DIPPING INTO THE UPPER-20S TO MID-30S FOR THE
INTERIOR NORTHEAST SUNDAY MORNING HAS PROMPTED A SECOND NIGHT OF
FROST/FREEZE RELATED WARNINGS AND ADVISORIES. COOLER AIR PUSHING
SOUTHWARD EAST OF THE APPALACHIANS WILL ALSO KEEP MORE MILD
TEMPERATURES IN THE FORECAST FOR MUCH OF THE MID-ATLANTIC, WITH
HIGHS MAINLY IN THE 70S. IN THE WEST, HIGHS WILL ALSO BE WELL
ABOVE AVERAGE SATURDAY ACROSS THE PACIFIC NORTHWEST AND NORTHERN
ROCKIES, WITH TEMPERATURES WELL INTO THE 80S. A PACIFIC SYSTEM
WILL BRING MUCH COOLER, BELOW AVERAGE TEMPERATURES TO THE PACIFIC
NORTHWEST ON SUNDAY, AS HIGHS FALL INTO THE 60S TO LOW 70S. HIGHS
WILL GENERALLY BE AROUND OR A BIT BELOW AVERAGE ACROSS THE
CENTRAL/SOUTHERN ROCKIES, SOUTHWEST, GREAT BASIN, AND CALIFORNIA,
WITH HIGHS IN THE 70S AND 80S, AND 90S TO LOW 100S FOR THE
DESERTS.
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