352
FXUS01 KWBC 300832
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
428 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 IMPULSES EJECTING FROM THE WESTERN U.S.
UPPER TROUGH. THE IMPULSES WILL BEGIN TO ERODE THE UPPER RIDGE
RESPONSIBLE FOR THE ONGOING HEAT WAVE ACROSS THE SOUTH AND HELP
BRINGING 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 ALONG THE WEST
COAST AND THEN REACH INTO THE NORTHERN PLAINS BY SUNDAY. THE
INTERIOR VALLEYS OF CENTRAL AND NORTHERN CALIFORNIA WILL SEE
AFTERNOON TEMPERATURES CLIMBING WELL UP INTO THE 100S TO NEAR 110
DEGREES AT THE HOTTEST LOCATIONS ON SATURDAY, WHILE THE DESERT
SOUTHWEST WILL SEE HIGH TEMPERATURES REACHING WELL UP INTO THE
110S. THESE TEMPERATURES WILL INCREASE THE RISK OF HEAT-RELATED
ILLNESSES IN THESE AREAS BY THIS WEEKEND. MEANWHILE IN THE
OPPOSITE CORNER OF THE COUNTRY, AFTER A DAY OF DRIER WEATHER
ACROSS THE NORTHEAST TODAY, SHOWERS AND THUNDERSTORMS FROM THE
MIDWEST ARE FORECAST TO REACH INTO THE CENTRAL AND SOUTHERN
APPALACHIANS BEFORE SLOWLY EDGING INTO INTERIOR NEW ENGLAND BY
SUNDAY MORNING AHEAD OF A COLD FRONT.
IN ADDITION TO THE HEAT AND THE SEVERE STORMS, CANADIAN WILDFIRE
SMOKE IS EXPECTED TO CONTINUE IMPACTING PORTIONS OF THE
NORTHEASTERN QUADRANT OF THE U.S. OVER THE NEXT FEW DAYS.
HOWEVER, AIR QUALITY IS EXPECTED TO SLOWLY IMPROVE DUE TO A
COMBINATION OF THUNDERSTORM ACTIVITY AND DISPERSION OF THE SMOKE
AS WE HEAD INTO THE WEEKEND.
KONG
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