558
FXUS01 KWBC 080737
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
336 AM EDT SUN SEP 08 2024
VALID 12Z SUN SEP 08 2024 - 12Z TUE SEP 10 2024
...DANGEROUS HEAT CONTINUES TO IMPACT PORTIONS OF SOUTHERN
CALIFORNIA AND THE SOUTHWEST THROUGH MONDAY...
...HEAVY RAIN AND SCATTERED INSTANCES OF FLASH FLOODING REMAIN
POSSIBLE ALONG THE GULF COAST AND PARTS OF THE SOUTHEAST OVER THE
NEXT SEVERAL DAYS...
...BELOW AVERAGE TEMPERATURES FORECAST ACROSS MUCH OF THE MIDWEST
AND EAST THROUGH THE BEGINNING OF THE WEEK...
POTENTIALLY DANGEROUS AND RECORD-BREAKING HEAT IS FORECAST TO
CONTINUE ACROSS SOUTHERN CALIFORNIA AS HIGHS SOAR INTO THE UPPER
90S AND TRIPLE DIGITS AWAY FROM THE IMMEDIATE COASTLINE. EXCESSIVE
HEAT WARNINGS REMAIN IN EFFECT THROUGH MONDAY AS A GRADUAL
COOLDOWN COMMENCES ON TUESDAY. HIGHS INTO THE TRIPLE DIGITS ARE
ALSO FORECAST THROUGHOUT THE REMAINDER OF THE DESERT SOUTHWEST,
BUT NOT CONSIDERED AS ANOMALOUS AS VALUES FORECAST ACROSS SOUTHERN
CALIFORNIA. ELSEWHERE, ABOVE AVERAGE TEMPERATURES ARE ANTICIPATED
ACROSS THE NORTHERN GREAT BASIN AND NORTHERN PLAINS AS UPPER-LEVEL
RIDGING SLIDES EASTWARD. HEAT WILL WANE ACROSS EASTERN WASHINGTON
AND NEIGHBORING STATES BY TUESDAY AS THE CORE OF THE LATE-SUMMER
TEMPERATURES CONCENTRATE OVER THE NORTHERN PLAINS. HIGHS IN THE
NORTH-CENTRAL U.S. ARE FORECAST TO REACH INTO THE LOW-TO-MID 90S
EARLY THIS WEEK, WHICH EQUATES TO AROUND 10 TO 20 DEGREES ABOVE
AVERAGE FOR THIS TIME OF YEAR. ADDITIONALLY, SULTRY HEAT AND
HUMIDITY WILL IMPACT SOUTHERN FLORIDA ONCE AGAIN TODAY, WHERE HEAT
ADVISORIES HAVE BEEN ISSUED DUE TO MAXIMUM HEAT INDICES FORECAST
TO NEAR 110 DEGREES. REMEMBER TO FOLLOW PROPER HEAT SAFETY BY
STAYING HYDRATED, LIMITING STRENUOUS OUTDOOR ACTIVITY DURING PEAK
DAYTIME HEATING, AND CHECKING ON VULNERABLE INDIVIDUALS.
MUCH OF THE NATION IS ANTICIPATED TO BE VOID OF NOTABLE
PRECIPITATION OVER THE NEXT FEW DAYS, WITH THE GULF COAST AND
PARTS OF THE SOUTHEAST BEING THE LONE EXCEPTION. A LINGERING
STATIONARY FRONT AND DEVELOPING AREA OF LOW PRESSURE IN THE
WESTERN GULF OF MEXICO WILL FOCUS HEAVY RAINFALL POTENTIAL FROM
THE COASTAL CAROLINAS TO THE FLORIDA PENINSULA AND ENTIRE GULF
COAST REGION. SCATTERED FLASH FLOODING IS POSSIBLE WHERE THE
HEAVIEST RAINFALL OCCURS, WITH URBAN AND LOW-LYING AREAS MOST AT
RISK TO FLOODING IMPACTS. OTHERWISE, ISOLATED FLASH FLOODING IS
ALSO POSSIBLE IN PARTS OF THE INTERMOUNTAIN WEST THROUGH EARLY
THIS WEEK DUE TO WIDELY SCATTERED THUNDERSTORMS DEVELOPING IN
TANDEM WITH DAYTIME HEATING.
LARGE SURFACE HIGH PRESSURE EXTENDING FROM THE SOUTHERN PLAINS TO
THE MIDWEST AND EAST THROUGHOUT TUESDAY WILL NOT ONLY SUPPLY SUNNY
AND DRY CONDITIONS FOR MUCH OF THE LOWER 48, BUT WELL BELOW
AVERAGE TEMPERATURES AS WELL. IN FACT, DAILY RECORD LOWS ARE
POSSIBLE BETWEEN THE MIDWEST AND MID-ATLANTIC THIS MORNING AS
TEMPERATURES DIP INTO THE 40S FOR MOST LOCATIONS. PATCHY FROST IS
POSSIBLE IN LOW LYING PROTECTED AREAS. AS THIS AUTUMNAL AIRMASS
MODERATES SOMEWHAT EARLY THIS WEEK, AFTERNOON TEMPERATURES WILL
GRADUALLY WARM BACK INTO THE MID-80S BY TUESDAY.
SNELL
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