988
FXUS01 KWBC 281901
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
300 PM EDT WED JUN 28 2023
VALID 00Z THU JUN 29 2023 - 00Z SAT JUL 01 2023
...RECORD HEAT EXPECTED FROM THE CENTRAL TO SOUTHERN PLAINS INTO
THE LOWER MISSISSIPPI VALLEY, LOWER OHIO VALLEY,LOWER TENNESSEE
VALLEY AND CENTRAL GULF COAST...
...SMOKE FROM CANADIAN WILDFIRES TO CONTINUE TO PRODUCE POOR AIR
QUALITY FROM THE NORTHERN PLAINS INTO THE GREAT LAKES, MID WEST
OHIO VALLEY AND MID-ATLANTIC...
...HEAT ALSO FORECAST TO BUILD THROUGH THE INTERIOR VALLEYS OF
CALIFORNIA...
...SEVERE THUNDERSTORMS POSSIBLE FROM THE CENTRAL PLAINS INTO THE
MID MISSISSIPPI VALLEY AND LOWER OHIO VALLEY...
...ELEVATED TO CRITICAL FIRE WEATHER CONDITIONS TO PERSIST FROM
THE FOUR CORNERS REGION INTO THE SOUTHWEST...
AN EXPANDING MID TO UPPER LEVEL RIDGE ACROSS THE SOUTHERN PLAINS
INTO THE LOWER MISSISSIPPI VALLEY WILL CONTINUE TO DRIVE THE
RECORD HEAT WAVE AFFECTING THE SOUTHERN PORTION OF THE NATION.
THE RECORD HIGH TEMPERATURES THAT HAVE BEEN MOSTLY OVER TEXAS AND
FAR SOUTHEAST NEW MEXICO OVER THE PAST WEEK WILL NOW BE EXPANDING
INTO PORTIONS OF THE CENTRAL PLAINS, LOWER MISSISSIPPI VALLEY AND
CENTRAL GULF COASTAL REGION OVER THE NEXT FEW DAYS. NUMEROUS
RECORD HIGH MAXIMUM TEMPERATURES IN THE LOWER 100S AND RECORD HIGH
MINIMUM TEMPERATURES IN THE UPPER 70S TO LOWER 80S ARE POSSIBLE
OVER THE NEXT FEW DAYS ACROSS THESE AREAS. THIS WILL CONTINUE TO
PRODUCE LIFE THREATENING HEAT WAVE CONDITIONS ACROSS A LARGE
PORTION OF THE NATION FROM SOUTHEAST NEW MEXICO, THROUGH MUCH OF
THE SOUTHERN PLAINS, EASTERN KANSAS, INTO THE LOWER MISSISSIPPI
VALLEY, LOWER OHIO VALLEY, LOWER TENNESSEE VALLEY AND THE CENTRAL
GULF COASTAL REGION. ACROSS THESE REGIONS, EXCESSIVE HEAT
WARNINGS AND HEAT ADVISORIES ARE IN EFFECT AND WILL LIKELY REMAIN
IN EFFECT THROUGH THE REMAINDER OF THIS WEEK. THE COMBINATION OF
THE RECORD HIGH TEMPERATURES, ALONG WITH HIGH SURFACE DEW POINTS
WILL PRODUCE LIFE THREATENING HEAT INDICES VALUES IN THE 100 TO
120 DEGREE RANGE ACROSS THESE AREAS. THE HIGHEST HEAT INDICES
OVER THE NEXT SEVERAL DAYS EXPECTED TO AFFECT CITIES FROM DALLAS
TO HOUSTON, NEW ORLEANS, JACKSON, LITTLE ROCK, MEMPHIS AND
NASHVILLE, WHERE HEAT INDICES VALUES OFF 110 TO 120 ARE EXPECTED.
WHILE THE SOUTHERN U.S. GRAPPLES WITH EXCESSIVE HEAT OVER THE NEXT
FEW DAYS, POOR AIR QUALITY EXPECTED TO CONTINUE AS SMOKE FROM THE
PERSISTENT CANADIAN WILDFIRES CONTINUES TO BE DRAWN SOUTHWARD INTO
THE LOWER 48. AIR QUALITY ADVISORIES AND ALERTS CURRENTLY STRETCH
FROM THE UPPER MISSISSIPPI VALLEY, THROUGH THE MID-WEST, GREAT
LAKES, OHIO VALLEY AND INTO THE MID-ATLANTIC. WITH NO END IN SITE
TO THE CANADIAN WILDFIRES AND WEST TO NORTHWESTERLY WINDS EXPECTED
TO PERSIST FROM SOUTH CENTRAL CANADA INTO THE NORTH CENTRAL TO
NORTHEAST U.S., POOR AIR QUALITY CONDITIONS ARE LIKELY TO
CONTINUE.
FARTHER WEST, HEAT WILL ALSO BE BUILDING OVER THE INTERIOR VALLEY
OF CALIFORNIA LATE THIS WEEK AS A MID TO UPPER LEVEL RIDGE
STRENGTHENS OVER CALIFORNIA AND THE GREAT BASIN. EXCESSIVE HEAT
WATCHES ARE IN EFFECT FOR MUCH OF THE SACRAMENTO AND SAN JOAQUIN
VALLEYS WHERE HIGH TEMPERATURES IN THE LOWER 100S ARE FORECAST
FROM LATE WEEK INTO THIS WEEKEND.
ON THE NORTHERN EDGE OF THE HOT TEMPERATURES ACROSS THE SOUTHERN
TO CENTRAL PLAINS, A STATIONARY FRONTAL BOUNDARY IS EXPECTED TO
LIE WEST TO EAST ACROSS THE CENTRAL PLAINS INTO THE MID
MISSISSIPPI VALLEY AND LOWER OHIO VALLEY REGIONS. THIS FRONT WILL
ACT A FOCUS FOR POTENTIALLY SEVERE THUNDERSTORMS FROM WEDNESDAY
NIGHT THROUGH FRIDAY. IN ADDITION TO THE SEVERE WEATHER THREAT,
HEAVY RAINS FROM THESE STORMS ALSO POSE A RISK FOR ISOLATED FLASH
FLOODS.
THERE IS NOT EXPECTED TO BE ANY SIGNIFICANT CHANGES TO THE CURRENT
WEATHER PATTERN FROM THE FOUR CORNERS REGION INTO THE SOUTHWEST
AND PORTIONS OF THE SOUTHERN HIGH PLAINS. ACROSS THESE AREAS, DRY
CONDITIONS, LOWER RELATIVE HUMIDITIES AND GUSTY SURFACE WINDS WILL
CONTINUE TO SUPPORT A LARGE REGION OF ELEVATED TO CRITICAL FIRE
WEATHER CONDITIONS THROUGH LATE WEEK.
ORAVEC
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