330
FXUS01 KWBC 180752
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
352 AM EDT FRI AUG 18 2023
VALID 12Z FRI AUG 18 2023 - 12Z SUN AUG 20 2023
...HEAVY RAINFALL AND FLASH FLOODING BECOMING MORE LIKELY OVER
PARTS OF THE SOUTHWEST...
...CRITICAL FIRE CONDITIONS EXPECTED FROM THE NORTHWEST TO THE
NORTHERN HIGH PLAINS TODAY...
..DANGEROUS HEAT REDEVELOPING OVER THE CENTRAL U.S..
MONSOONAL MOISTURE ALONG WITH TROPICAL MOISTURE ASSOCIATED WITH
HURRICANE HILLARY WILL BEGIN TO INCREASE THUNDERSTORM COVERAGE
ACROSS PORTIONS OF THE SOUTHWEST TODAY, WITH HEAVY RAINFALL AND
FLASH FLOODING POSSIBLE. AS HILLARY CONTINUES TO TRACK NORTH IN
THE EASTERN PACIFIC NEAR BAJA CALIFORNIA, THE THREAT FOR HEAVY
RAINFALL AND FLASH FLOODING IS LIKELY TO INCREASE ON SATURDAY,
ESPECIALLY FOR PORTIONS OF SOUTHERN CALIFORNIA, WESTERN ARIZONA,
AND SOUTHERN NEVADA. WITH THE INCREASE IN CLOUD COVER,
TEMPERATURES WILL RETURN TO MORE SEASONAL VALUES TODAY BEFORE
DROPPING BELOW NORMAL ACROSS MUCH OF SOUTHERN CALIFORNIA, WESTERN
ARIZONA, AND THE GREAT BASIN OVER THE WEEKEND.
FARTHER TO THE NORTH, AN AREA OF LOW PRESSURE IS FORECAST TO
STRENGTHEN OVER THE CANADIAN PRAIRIE. WINDY AND MOSTLY DRY
CONDITIONS TO ITS SOUTH AND SOUTHWEST WILL LEAD TO CRITICAL FIRE
CONDITIONS EXTENDING FROM THE INLAND NORTHWEST TO NORTHEASTERN
MONTANA TODAY.
OVER THE CENTRAL U.S., DANGEROUS HEAT WILL CONTINUE TO INTENSIFY
WITH WELL-ABOVE NORMAL TO RECORD-BREAKING TEMPERATURES EXPECTED
FROM THE CENTRAL GULF COAST AND LOWER MISSISSIPPI VALLEY TO THE
NORTHERN HIGH PLAINS TODAY. THIS HEAT WILL PERSIST FROM THE
SOUTHERN PLAINS TO THE CENTRAL GULF COAST INTO THE WEEKEND WHILE
BUILDING ACROSS THE CENTRAL PLAINS AND SHIFTING EAST ACROSS THE
NORTHERN PLAINS INTO THE UPPER MIDWEST. HOWEVER, A COLD FRONT
TRAILING THE PREVIOUSLY NOTED LOW OVER CANADA WILL BRING RELIEF TO
THE NORTHERN HIGH PLAINS OVER THE WEEKEND.
IN THE EASTERN U.S., SHOWERS AND THUNDERSTORMS WITH AREAS OF HEAVY
RAINFALL WILL ACCOMPANY AN AREA OF LOW PRESSURE AND ITS COLD FRONT
AS THEY MOVE ACROSS THE NORTHEAST TODAY. BEHIND THE FRONT, HIGH
PRESSURE WITH SEASONAL TO BELOW-AVERAGE TEMPERATURES WILL MOVE
FROM THE GREAT LAKES AND OHIO VALLEY INTO THE NORTHEAST AND
MID-ATLANTIC STATES TODAY AND SATURDAY. THE FRONT IS FORECAST TO
STALL ACROSS THE SOUTHEAST, WHERE SEASONAL TO ABOVE-NORMAL
TEMPERATURES ARE FORECAST INTO THE WEEKEND.
PEREIRA
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