906
FXUS01 KWBC 091939
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
338 PM EDT SAT SEP 09 2023
VALID 00Z SUN SEP 10 2023 - 00Z TUE SEP 12 2023
...DANGEROUS HEAT TO CONTINUE ACROSS THE SOUTHWEST AND PARTS OF
TEXAS...
...WIDESPREAD SHOWERS, THUNDERSTORMS, AND COOLER TEMPERATURES WILL
SPREAD ACROSS THE NORTHERN/CENTRAL PLAINS AND MIDWEST...
...UNSETTLED WEATHER CONTINUES ACROSS THE EAST, WITH LOCALLY HEAVY
RAINFALL AND ISOLATED SEVERE STORMS POSSIBLE...
SUMMER MAINTAINS ITS GRIP OVER THE SOUTHWEST, SOUTHERN PLAINS, AND
WESTERN GULF COAST WELL INTO SEPTEMBER. HIGH TEMPERATURES INTO THE
TRIPLE DIGITS (UP TO THE 110S IN THE DESERT SOUTHWEST) THROUGH THE
END OF THIS WEEKEND WILL THREATEN NUMEROUS DAILY HIGH TEMPERATURE
RECORDS. WHEN COMBINED WITH OPPRESSIVE HUMIDITY IN PLACE, HEAT
INDICES OVER 110 DEGREES ARE FORECAST OVER PARTS OF SOUTH TEXAS.
FORTUNATELY, A SINKING COLD FRONT AND WEAKENING UPPER RIDGE WILL
BRING RELIEF TO THESE REGIONS BY THE BEGINNING OF THE WEEK.
RESIDENTS AND VISITORS SHOULD CONTINUE TO FOLLOW PROPER HEAT
SAFETY, ALONG WITH CHECKING IN ON VULNERABLE FRIENDS, FAMILY, AND
NEIGHBORS. EXCESSIVE HEAT WARNINGS REMAIN IN EFFECT OVER DESERT
REGIONS OF SOUTHEAST CALIFORNIA AND SOUTHERN ARIZONA.
A POTENT COLD FRONT USHERING IN BELOW AVERAGE TEMPERATURES ACROSS
MUCH OF THE CENTRAL U.S. BY MONDAY WILL ALSO PRODUCE WIDESPREAD
RAINFALL CHANCES OVER THE NEXT COUPLE OF DAYS. HEAVY RAIN AND
SCATTERED SEVERE THUNDERSTORMS ARE POSSIBLE IN PARTS OF THE
CENTRAL PLAINS TODAY AND THE SOUTHERN HIGH PLAINS ON SUNDAY AS THE
AFOREMENTIONED FRONT PUSHES SOUTHWARD. HEAVY RAIN MAY ALSO LEAD TO
AREAS OF FLASH FLOODING THROUGHOUT WESTERN KANSAS AND NEARBY
SURROUNDING AREAS, PROMPTING A SLIGHT RISK (LEVEL 2/4) OF
EXCESSIVE RAINFALL TO BE ISSUED. AS AN ASSOCIATED LOW PRESSURE
SYSTEM TRACKS INTO THE GREAT LAKES ON MONDAY, WIDESPREAD SHOWERS
AND ISOLATED THUNDERSTORMS ARE FORECAST TO SHIFT EASTWARD.
THROUGHOUT THE EASTERN U.S., A STATIONARY BOUNDARY LINGERING OVER
THE REGION ALONG WITH ELEVATED ATMOSPHERIC MOISTURE CONTENT AND
INSTABILITY WILL CONTINUE TO FUEL DEVELOPING THUNDERSTORMS ON
SUNDAY, WITH THESE RAINFALL CHANCES MOSTLY CONFINING TO THE
NORTHEAST ON MONDAY. SOME STORMS MAY TURN SEVERE AND CONTAIN
DAMAGING WIND GUSTS AND FROM THE CAROLINA TO NEW ENGLAND, WITH THE
GREATEST THREAT CENTERED OVER EASTERN PENNSYLVANIA THROUGH
TONIGHT. ADDITIONALLY, THE SLOW-MOVING NATURE OF THESE STORMS AND
INTENSE DOWNPOURS COULD LEAD TO AREAS OF FLASH FLOODING FROM THE
CENTRAL APPALACHIANS TO SOUTHERN NEW ENGLAND. URBAN AREAS AND
VALLEYS SURROUNDED BY COMPLEX TERRAIN ARE MOST AT RISK TO RAPID
RUNOFF AND FLOODING IMPACTS UNTIL THE END OF THE WEEKEND.
SNELL
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