702
FXUS01 KWBC 152000
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
359 PM EDT TUE AUG 15 2023
VALID 00Z WED AUG 16 2023 - 00Z FRI AUG 18 2023
...INTENSE HEAT AND RECORD TEMPERATURES FOR PORTIONS OF THE
NORTHWEST AND TEXAS TO CONTINUE THIS WEEK...
..SEVERE THUNDERSTORMS POSSIBLE FOR THE UPPER MIDWEST WEDNESDAY
...SHOWERS, THUNDERSTORMS, AND ISOLATED FLASH FLOODING WILL
CONTINUE ACROSS THE FOUR CORNERS REGION...
THE WELL ABOVE NORMAL AND RECORD TEMPERATURES ARE FORECAST TO
PERSIST OVER THE PACIFIC NORTHWEST AND INTO THE NORTHERN ROCKIES
FOR THE NEXT COUPLE OF DAYS, BUOYED BY A STRONG UPPER RIDGE (HEAT
DOME) THAT EXTENDS ACROSS THE ROCKIES. DAYTIME TEMPERATURES WELL
INTO THE 90S AND LOW 100S WILL ONLY COOL TO THE UPPER 60S TO 70S,
OFFERING ONLY BRIEF RELIEF AT NIGHT. THESE WILL LIKELY APPROACH OR
EXCEED DAILY RECORDS OVER THE NORTHWEST ON WEDNESDAY AND WILL
EXPAND INTO TEXAS ON THURSDAY. THERE, TEMPERATURES OF 100-110F
WILL COMBINE WITH THE HUMIDITY TO PRODUCE HEAT INDICES INTO THE
110S. IN ADDITION, TEMPERATURES WILL RISE INTO THE 90S ACROSS THE
UPPER MIDWEST ON WEDNESDAY AHEAD OF A COLD FRONT WHICH WILL ACT AS
A FOCUS FOR THUNDERSTORMS, SOME OF WHICH MAY BE SEVERE.
TEMPERATURES WILL COOL ON THURSDAY BEHIND THE FRONT. ON THE FLIP
SIDE, MANY AREAS IN THE EASTERN LOWER 48 WILL SEE TEMPERATURES
NEAR TO BELOW NORMAL ON WEDNESDAY BEHIND A COLD FRONT THAT IS
DRAPED ALONG THE EAST COAST AND THE SOUTHEAST. BY THURSDAY,
TEMPERATURES SHOULD MODERATE SEVERAL DEGREES AS MOST AREAS SEE
HIGHS INTO THE 80S.
OVER PARTS OF THE FOUR CORNERS REGION, A SOUTHERLY TO
SOUTHEASTERLY FLOW ALOFT WILL BRING IN SOME MOISTURE TO THE
REGION, HELPING TO FUEL AFTERNOON SHOWERS AND SOME THUNDERSTORMS
WEDNESDAY AND THURSDAY. ISOLATED FLASH FLOODING IS POSSIBLE,
ESPECIALLY IN MORE VULNERABLE AREAS. TEMPERATURES WILL BE NEAR
NORMAL OVER THE REGION AS THIS AREA WILL BE JUST TO THE SOUTHWEST
OF THE ELONGATED HEAT DOME, THOUGH SOUTHERN ARIZONA MAY APPROACH
DAILY RECORDS ON THURSDAY. ALONG THE GULF COAST INTO FLORIDA,
SOUTH OF A SLOWLY-MOVING (AND EVENTUALLY STALLING) COLD FRONT,
SCATTERED SHOWER AND STORMS ARE LIKELY OVER THE NEXT COUPLE OF
DAYS WITH TYPICALLY WARM/HOT TEMPERATURES INTO THE LOW 90S.
FRACASSO
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