947
FXUS01 KWBC 280741
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
341 AM EDT SAT SEP 28 2024
VALID 12Z SAT SEP 28 2024 - 12Z MON SEP 30 2024
...HELENE IS FORECAST TO CONTINUE TO WEAKEN AND DISSIPATE BY
MONDAY...
...THERE IS A MARGINAL RISK OF EXCESSIVE RAINFALL OVER PARTS OF
THE OHIO/TENNESSEE VALLEYS ON SATURDAY AND OVER THE CENTRAL
APPALACHIANS/MID-ATLANTIC SUNDAY...
...THERE ARE EXCESSIVE HEAT WARNINGS OVER PARTS OF SOUTHEASTERN
CALIFORNIA AND THE SOUTHWEST...
HELENE IS FORECAST TO CONTINUE TO WEAKEN AND DISSIPATE BY MONDAY.
THE SYSTEM WILL PRODUCE MODERATE TO HEAVY RAIN OVER PARTS OF THE
OHIO/TENNESSEE VALLEYS. THEREFORE, THE WPC HAS ISSUED A MARGINAL
RISK (LEVEL 1/4) OF EXCESSIVE RAINFALL OVER PARTS OF THE
OHIO/TENNESSEE VALLEYS THROUGH SUNDAY MORNING. THE ASSOCIATED
HEAVY RAIN WILL CREATE LOCALIZED AREAS OF FLASH FLOODING,
AFFECTING AREAS THAT EXPERIENCE RAPID RUNOFF WITH HEAVY RAIN.
ON SUNDAY, THE AREA OF MODERATE TO HEAVY RAIN WILL MOVE EASTWARD
TO THE CENTRAL APPALACHIANS/MID-ATLANTIC. THEREFORE, THE WPC HAS
ISSUED A MARGINAL RISK (LEVEL 1/4) OF EXCESSIVE RAINFALL OVER
PARTS OF THE CENTRAL APPALACHIANS/MID-ATLANTIC FROM SUNDAY THROUGH
MONDAY MORNING. THE ASSOCIATED HEAVY RAIN WILL CREATE LOCALIZED
AREAS OF FLASH FLOODING, AFFECTING AREAS THAT EXPERIENCE RAPID
RUNOFF WITH HEAVY RAIN. IN ADDITION, THERE WILL BE A MARGINAL RISK
OF EXCESSIVE RAINFALL OVER PARTS OF THE FLORIDA PENINSULA ON
SATURDAY AND SUNDAY.
MEANWHILE, A WAVE OF LOW PRESSURE OVER THE PACIFIC NORTHWEST WILL
MOVE NORTHEASTWARD INTO WEST-CENTRAL CANADA BY SUNDAY WHILE THE
TRAILING FRONT MOVES INTO THE NORTHERN PLAINS. THE SYSTEM IS
EXPECTED TO PRODUCE LITTLE PRECIPITATION ALONG THE BOUNDARY.
MOREOVER, AN UPPER-LEVEL HIGH WILL REMAIN OVER THE FOUR CORNERS
REGION THROUGH MONDAY. HIGH TEMPERATURES OVER SOUTHEASTERN
CALIFORNIA AND THE SOUTHWEST WILL RANGE FROM THE UPPER 90S TO
110S, AND LOW TEMPERATURES WILL BE IN THE UPPER 80S TO LOW 90S,
PROVIDING LITTLE RELIEF FROM THE HEAT OVERNIGHT. THE TEMPERATURES
HAVE PROMPTED EXCESSIVE HEAT WARNINGS OVER PARTS OF SOUTHEASTERN
CALIFORNIA AND THE SOUTHWEST.
ZIEGENFELDER
GRAPHICS AVAILABLE AT
HTTPS://WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
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