100
FXUS01 KWBC 241928
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
327 PM EDT MON JUL 24 2023
VALID 00Z TUE JUL 25 2023 - 00Z THU JUL 27 2023
...NO LET UP TO THE HEAT WITH ABOVE AVERAGE TEMPERATURES EXPECTED
ACROSS MUCH OF THE LOWER 48 OVER THE NEXT FEW DAYS...
...ADDITIONAL RECORD HIGHS POSSIBLE FROM THE SOUTHWEST INTO THE
SOUTHERN PLAINS AND ACROSS SOUTH FLORIDA...
...SEVERE WEATHER THREAT FROM THE NORTHERN PLAINS INTO THE MID
WEST AND ACROSS THE MID-ATLANTIC...
...CANADIAN WILDFIRES TO CONTINUE TO PRODUCE POOR AIR QUALITY FROM
THE UPPER MISSISSIPPI VALLEY INTO THE GREAT LAKES AND OHIO
VALLEY...
...ELEVATED TO CRITICAL FIRE WEATHER THREAT ACROSS THE NORTHERN
GREAT BASIN AND NORTHERN ROCKIES...
THE PERSISTENT MID TO UPPER LEVEL HIGH PARKED OVER THE SOUTHWEST
WILL MOVE LITTLE OVER THE NEXT FEW DAYS. THIS WILL CONTINUE THE
STRING OF DAYS IN WHICH RECORD HIGH TEMPERATURES ARE SET ACROSS
PORTIONS OF THE SOUTHWEST INTO THE SOUTHERN PLAINS AND ACROSS
SOUTH FLORIDA. THERE HAS BEEN A REDUCTION OVER THE PAST FEW DAYS
IN THE NUMBER OF RECORDS SET FROM THE SOUTHWEST INTO THE SOUTHERN
PLAINS AND SOUTH FLORIDA COMPARED TO THE PEAK SET LAST WEEK.
HOWEVER, WITH THE UPPER RIDGE REMAINING IN PLACE, MUCH ABOVE
AVERAGE TEMPERATURES AND DANGEROUS HEAT INDICES WILL CONTINUE
ACROSS THE SOUTHWEST, THROUGH PORTIONS OF THE PLAINS AND OVER
SOUTH FLORIDA. ACROSS THESE AREAS EXCESSIVE HEAT WARNINGS AND HEAT
ADVISORIES ARE CURRENTLY IN EFFECT. OVER THE NEXT SEVERAL DAYS,
NEARLY ALL OF THE LOWER 48 WILL HAVE ABOVE AVERAGE TEMPERATURES AS
THE SOUTHWEST TO SOUTHERN PLAINS UPPER RIDGE BUILDS TO THE EAST
AND NORTHEAST. THE ONE EXCEPTION TO THIS WILL BE ACROSS THE
NORTHERN ROCKIES INTO THE PACIFIC NORTHWEST WHERE A COLD FRONT
MOVING OFF THE NORTHEAST PACIFIC WILL PRODUCE BELOW AVERAGE
TEMPERATURES.
ALONG THE NORTHERN PERIPHERIES OF THE BUILDING UPPER RIDGE FROM
THE SOUTHWEST INTO THE MID SECTION OF THE COUNTRY A FRONTAL ZONE
WILL DRAPE FROM THE NORTHERN PLAINS INTO THE MID WEST AND MID
ATLANTIC REGION. THIS FRONTAL BOUNDARY WILL BE THE FOCUS FOR
AREAS OF ACTIVE THUNDERSTORMS, PRODUCING AREAS OF SEVERE WEATHER,
HEAVY RAINS AND ISOLATED FLASH FLOODING ACROSS THE NORTHERN PLAINS
AND MID-ATLANTIC ON TUESDAY AND ACROSS THE MID-WEST ON WEDNESDAY.
NORTHWESTERLY TO WESTERLY MID TO UPPER LEVEL FLOW ACROSS CENTRAL
TO SOUTHERN CANADA INTO THE NORTHERN TIER OF THE U.S. WILL
CONTINUE TO TRANSPORT THE PERSISTENT WESTERN CANADIAN WILD FIRE
SMOKE SOUTHEAST. THIS WILL PRODUCE POOR AIR QUALITY FROM THE
NORTHERN PLAINS, SOUTHEASTWARD INTO THE GREAT LAKES AND OHIO
VALLEY REGION OVER THE NEXT FEW DAYS.
WHILE TEMPERATURES ARE EXPECTED TO BE BELOW AVERAGE ACROSS THE
NORTHWESTERN U.S. OVER THE NEXT FEW DAYS IN THE WAKE OF THE INLAND
MOVING COLD FRONT, DRY CONDITIONS, LOWER RELATIVE HUMIDITIES AND
GUSTY WINDS WILL SUPPORT AN ELEVATED TO CRITICAL FIRE WEATHER
THREAT ACROSS THE NORTHERN GREAT BASIN AND NORTHERN ROCKIES.
ORAVEC
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