823
FXUS01 KWBC 260751
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
350 AM EDT TUE SEP 26 2023
VALID 12Z TUE SEP 26 2023 - 12Z THU SEP 28 2023
...POCKETS OF UNSETTLED WEATHER FOUND THROUGHOUT THE NORTHWEST,
SOUTHEAST, MIDWEST, AND OHIO VALLEY OVER THE NEXT FEW DAYS ALONG
WITH CHANCES FOR LOCALLY HEAVY RAINFALL...
...BELOW AVERAGE TEMPERATURES EXPECTED ACROSS THE NORTHWEST AND
FROM SOUTHERN NEW ENGLAND INTO THE MID-ATLANTIC, WHILE ABOVE
AVERAGE HIGHS BUILD INTO THE CENTRAL PLAINS BY MIDWEEK...
THE FINAL FEW DAYS OF SEPTEMBER WILL FEATURE MOSTLY TRANQUIL
WEATHER CONDITIONS THROUGHOUT THE NATION OUTSIDE OF A FEW AREAS
EXPECTING SCATTERED SHOWERS AND THUNDERSTORMS. AFTER A COLD FRONT
MOVED THROUGH THE PACIFIC NORTHWEST YESTERDAY, WIDELY SCATTERED
SHOWERS ARE EXPECTED TO CONTINUE THROUGH TODAY BEFORE A POTENT LOW
PRESSURE SYSTEM SWINGS INTO THE REGION TONIGHT. LOCALLY HEAVY RAIN
AND ROUGH SURF FOR COASTAL LOCATIONS ARE POSSIBLE INTO EARLY
WEDNESDAY AS THE SYSTEM QUICKLY MOVES INLAND. RAINFALL IS EXPECTED
TO REMAIN MOSTLY BENEFICIAL GIVEN THE SEVERE TO EXTREME DROUGHT
CONDITIONS IN THE REGION. IN ADDITION TO THE WET WEATHER PATTERN,
BELOW AVERAGE HIGH TEMPERATURES ARE FORECAST THROUGHOUT THE
NORTHWEST, WITH PEAK VALUES ONLY REACHING INTO THE MID-60S.
FOR THE MIDWEST AND OHIO VALLEY, A SLOW-MOVING AREA OF LOW
PRESSURE IS EXPECTED TO PRODUCE AREAS OF MODERATE-TO-LOCALLY HEAVY
RAINFALL ACROSS THE MIDWEST TODAY AND OHIO VALLEY ON WEDNESDAY.
LOCALIZED FLASH FLOODING MAY OCCUR WITHIN THE HEAVIEST RAINFALL,
AS SHOWERS AND STORMS ARE LIKELY TO PROGRESS AT A SLOW PACE. SOME
STRONGER STORMS COULD ALSO CONTAIN ISOLATED HAIL AND DAMAGING WIND
GUSTS.
UNSETTLED WEATHER IS ALSO EXPECTED TO REMAIN IN THE FORECAST
THROUGHOUT PARTS OF THE MID-ATLANTIC AND SOUTHEAST AS A STALLED
FRONTAL BOUNDARY EXTENDS FROM THE WESTERN ATLANTIC TO THE EASTERN
GULF COAST. THE MAIN IMPACTS ACROSS THE MID-ATLANTIC WILL BE IN
THE FORM OF LIGHT SHOWERS AND WELL BELOW AVERAGE TEMPERATURES.
HIGH PRESSURE BUILDING INTO SOUTHERN QUEBEC WILL AID IN EASTERLY
FLOW AND AMPLE CLOUD COVER TO KEEP HIGH TEMPERATURES IN THE 60S
THROUGH MIDWEEK FROM SOUTHERN NEW ENGLAND TO THE MID-ATLANTIC.
MEANWHILE, WHERE THE AFOREMENTIONED FRONTAL BOUNDARY INTERACTS
WITH HIGHER ATMOSPHERIC MOISTURE CONTENT, SCATTERED THUNDERSTORMS
CAPABLE OF INTENSE RAINFALL RATES ARE POSSIBLE ACROSS MUCH OF
FLORIDA. URBAN FLOODING WILL BE THE GREATEST POTENTIAL IMPACT
SHOULD THUNDERSTORMS REMAIN RELATIVELY STATIONARY FOR A BRIEF
PERIOD OF TIME. A MARGINAL RISK (LEVEL 1/4) OF EXCESSIVE RAINFALL
HAS BEEN ISSUED ACROSS MUCH OF THE SUNSHINE STATE AND SOUTHERN
GEORGIA IN ORDER TO HIGHLIGHT THE LOCALIZED FLASH FLOOD POTENTIAL.
SUMMER WARMTH REMAINS OVER PARTS OF THE NORTHERN HIGH PLAINS TODAY
AND IS FORECAST TO SHIFT INTO THE CENTRAL PLAINS BY THURSDAY.
HIGHS INTO THE 80S AND LOW 90S ARE EXPECTED, WHICH EQUATES TO
AROUND 10 TO 20 DEGREES ABOVE AVERAGE WHEN COMPARED TO TYPICAL
LATE-SEPTEMBER AFTERNOON TEMPERATURES.
SNELL
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