996
FXUS01 KWBC 230520
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
119 AM EDT SUN JUL 23 2023
VALID 12Z SUN JUL 23 2023 - 12Z TUE JUL 25 2023
...EXCESSIVE HEAT WARNINGS AND ADVISORIES FROM PARTS OF
CALIFORNIA, THE NORTHERN INTERMOUNTAIN REGION, SOUTHWEST, AND THE
GREAT BASIN; A SECOND AREA IN FLORIDA AND THE WESTERN GULF COAST...
...THERE ARE AIR QUALITY ALERTS OVER PARTS OF THE UPPER
MISSISSIPPI VALLEY...
THE SEVERE WEATHER AND EXCESSIVE RAINFALL THREATS WILL DIMINISH
OVER THE COMING DAYS AS THE UPPER-LEVEL PATTERN WEAKENS A BIT. IN
THE MEANTIME, THE GULF COAST WILL EXPERIENCE SHOWERS AND
THUNDERSTORMS THANKS TO A QUASI-STATIONARY FRONT THAT IS DRAPED
ACROSS THE REGION. THIS FRONT WILL PROVIDE SOME FOCUS FOR THE
CONVECTIVE ACTIVITY AND POTENTIALLY ISOLATED INSTANCES OF FLASH
FLOODING THAT OCCURS. TROUGHING ACROSS THE EAST COAST WILL SUPPORT
SCATTERED THUNDERSTORMS ACROSS THE MID-ATLANTIC AND SOUTHEAST THIS
AFTERNOON AND EVENING. THERE'S A CHANCE THAT SOME OF THESE STORMS
MAY TURN SEVERE. THIS SAME TROUGH WILL SHUTTLE CANADIAN WILDFIRE
SMOKE DOWN INTO PARTS OF THE UPPER MISSISSIPPI VALLEY TODAY, WHERE
AIR QUALITY ALERTS ARE CURRENTLY IN EFFECT. A COLD FRONT
DESCENDING INTO THE GREAT LAKES WILL POTENTIALLY GENERATE
ADDITIONAL SCATTERED THUNDERSTORMS ACROSS THE MIDWEST THROUGH
MONDAY. MONSOONAL MOISTURE IS EXPECTED TO CONTINUE IMPACTING
PORTIONS OF THE SOUTHWEST AND FOUR CORNERS REGION WITH SCATTERED
SHOWERS AND THUNDERSTORMS FOR THE NEXT FEW DAYS.
THE DANGEROUS, LONG-LIVED AND RECORD-BREAKING HEAT WAVE WILL
CONTINUE OVER THE SOUTHWEST THROUGH THE REST OF THIS WEEKEND,
PARTICULARLY IN THE LOW DESERT AREAS, WITH TRIPLE DIGIT HIGH
TEMPERATURES ALSO EXTENDING NORTHWARD INTO THE CENTRAL GREAT
BASIN. TEMPERATURES NEXT WEEK ARE FORECAST TO REMAIN HOT, BUT
RETURN CLOSER TO AVERAGE. RELIEF ARRIVES TODAY FOR THE MID-SOUTH,
SOUTHEAST AND GULF COAST BUT EXCESSIVE HEAT AND HUMIDITY WILL
REBUILD ACROSS THESE AREAS BY LATE THIS WEEK. TAKE THE HEAT
SERIOUSLY AND AVOID EXTENDED TIME OUTDOORS. TEMPERATURES AND HEAT
INDICES WILL REACH LEVELS THAT WOULD POSE A HEALTH RISK TO ANYONE
WITHOUT EFFECTIVE COOLING AND/OR ADEQUATE HYDRATION. NIGHTTIME
TEMPERATURES WILL PROVIDE VERY LITTLE RELIEF. HEAT IS THE LEADING
WEATHER-RELATED KILLER IN THE U.S.. THE GREAT PLAINS WILL
EXPERIENCE A WARM UP OVER THE NEXT FEW DAYS AS AN UPPER RIDGE
BUILDS OVER THE REGION.
KEBEDE
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