289
FXUS01 KWBC 300805
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
400 AM EDT FRI JUN 30 2023
VALID 12Z FRI JUN 30 2023 - 12Z SUN JUL 02 2023
...MORE SEVERE THUNDERSTORMS AND AREAS OF HEAVY RAIN TO TRACK
EASTWARD FROM THE CENTRAL PLAINS TO THE OHIO VALLEY FOR THE NEXT
COUPLE OF DAYS...
...EXCESSIVE HEAT WARNINGS AND ADVISORIES ACROSS MUCH OF
CALIFORNIA INTO THE DESERT SOUTHWEST AS WELL AS THROUGH THE LOWER
AND MID-MISSISSIPPI VALLEY...
...AIR QUALITY ALERTS OVER PARTS OF THE MIDWEST, GREAT LAKES,
CENTRAL APPALACHIANS, NORTHEAST, AND MID-ATLANTIC...
A WAVY FRONT WILL CONTINUE TO BE THE FOCUS FOR SEVERE
THUNDERSTORMS AND AREAS OF HEAVY RAIN TO TRACK EASTWARD FROM THE
CENTRAL PLAINS TO THE OHIO VALLEY FOR THE NEXT COUPLE OF DAYS.
THE HEAVIEST AND STRONGEST STORMS ARE EXPECTED TO GRADUALLY SHIFT
FARTHER EAST EACH DAY AS A BETTER-DEFINED LOW PRESSURE WAVE
REACHES INTO THE LOWER GREAT LAKES BY SUNDAY MORNING.
THUNDERSTORM COMPLEXES THAT DEVELOP ALONG THE FRONT WILL LIKELY
CONTAIN HEAVY DOWNPOURS, HAIL, ALONG WITH DAMAGING WIND GUSTS,
WITH THE BEST CHANCE OF THESE TO OCCUR OVER THE MID-MISSISSIPPI
AND OHIO VALLEYS LATER ON SATURDAY PER THE STORM PREDICTION
CENTER. THE GRADUAL EASTWARD SHIFT OF THE SEVERE WEATHER IS IN
RESPONSE TO UPPER-LEVEL IMPLUSES EJECTING FROM THE WESTERN U.S.
UPPER TROUGH. THE IMPLUSES WILL BEGIN TO ERODE THE UPPER RIDGE
RESPONSIBLE FOR THE ONGOING HEAT WAVE ACROSS THE SOUTH AND HELP
BRINGING IN COOLER AIR EVER SO SLOWLY EAST ACROSS THE CENTRAL
PLAINS. THE HOTTEST TEMPERATURES INTO THE TRIPLE-DIGITS ARE
FORECAST TO REACH THE NORTHERN-MOST LOCATIONS IN MISSOURI TODAY
WHILE MORE OPPRESSIVE HUMIDITY WILL CONTINUE FARTHER SOUTH CLOSER
TO THE GULF COAST.
AS THE COOLER AIR REACHES INTO THE CENTRAL PLAINS THROUGH THE NEXT
COUPLE OF DAYS, HEAT WILL BEGIN TO BUILD FURTHER UP THE WEST COAST
AND THEN REACH INTO THE NORTHERN PLAINS BY SUNDAY. MEANHWILE,
AFTER A DAY OF DRIER WEATHER ACROSS THE NORTHEAST, SHOWERS AND
THUNDERSTORMS FROM THE MIDWEST ARE FORECAST TO REACH INTO THE
CENTRAL APPALACHIANS TODAY BEFORE SLOWLY EDGING INTO INTERIOR NEW
ENGLAND SATURDAY, AND ESPECIALLY BY SUNDAY MORNING AHEAD OF A COLD
FRONT.
IN ADDITION TO THE CURRENT WEATHER ACTIVITY, CANADIAN WILDFIRE
SMOKE IS EXPECTED TO CONTINUE IMPACTING PORTIONS OF THE EASTERN
U.S. OVER THE NEXT FEW DAYS. HOWEVER, AIR QUALITY IS EXPECTED TO
IMPROVE IN THE SHORT TERM AS A COMBINATION OF THUNDERSTORM
ACTIVITY AND DISPERSION OF SMOKE WILL ULTIMATELY RESULT IN
IMPROVING AIR QUALITY CONDITIONS FOR MUCH OF THE COUNTRY HEADING
INTO THE WEEKEND.
KONG/GENZ
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