057
FXUS01 KWBC 040809
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
400 AM EDT TUE JUL 04 2023
VALID 12Z TUE JUL 04 2023 - 12Z THU JUL 06 2023
...WELL ABOVE-NORMAL TO RECORD-BREAKING HEAT EXPECTED FOR PORTIONS
OF THE PACIFIC NORTHWEST...
...STRONG TO SEVERE STORMS LIKELY FOR PORTIONS OF THE NORTHERN TO
CENTRAL PLAINS AND INTO THE MIDWEST...
...SCATTERED THUNDERSTORMS EXPECTED TO LINGER ACROSS THE SOUTHERN
TIER STATES WHILE THUNDERSTORMS WITH LOCALLY HEAVY RAIN TODAY IN
NEW ENGLAND WILL LARGELY TAPER OFF BY WEDNESDAY...
ON THIS 4TH OF JULY, THE NORTHERN HIGH PLAINS WILL LIKELY BE THE
AREA HAVING THE BEST CHANCE OF SEEING SOME NATURAL FIREWORKS,
THANKS TO A RATHER STRONG INTRUSION OF COOL AIR FROM CANADA FOR
THIS TIME OF THE YEAR. LOCALLY HEAVY RAIN ALONG WITH STRONG TO
POSSIBLY SEVERE THUNDERSTORMS ARE EXPECTED TO DEVELOP BEHIND THE
COLD FRONT THAT MARKS THE BOUNDARY OF THE COOL AIR MASS. THE
HIGHEST THREAT OF HEAVY THUNDERSTORMS THIS MORNING WILL BE FROM
THE NORTHERN PLAINS TO THE UPPER MIDWEST. BY LATER TODAY AND INTO
TONIGHT, THE AXIS OF HEAVY RAIN/STORMS WILL PROGRESS FARTHER SOUTH
TOWARD THE CENTRAL PLAINS. BY WEDNESDAY INTO EARLY ON THURSDAY,
THE THREAT OF STRONG THUNDERSTORMS SHOULD LESSEN AS THEY SHIFT
FARTHER EAST ACROSS THE UPPER MIDWEST INTO THE GREAT LAKES.
PERIODS OF RAIN AND EMBEDDED THUNDERSTORMS CAN ALSO BE EXPECTED
ALONG THE EASTERN SLOPES OF THE NORTHERN AND CENTRAL ROCKIES
THROUGH THE NEXT COUPLE OF DAYS AS THE COOL AIR WILL BE FORCED TO
LIFT ALONG THE TERRAIN BEHIND THE COLD FRONT. MEANWHILE, A
DRASTIC COOL DOWN IS EXPECTED BEHIND THE FRONT WITH RECORD COOL
DAY-TIME TEMPERATURES POSSIBLE IN WYOMING TODAY AND WEDNESDAY.
IN THE WEST, TEMPERATURES ARE EXPECTED TO REMAIN ABOVE NORMAL
ALONG MUCH OF THE WEST COAST INTO THE SOUTHWESTERN U.S., WITH SOME
RECORD HIGH TEMPERATURES POSSIBLE FOR PORTIONS OF WESTERN OREGON
TODAY. WITH TEMPERATURES LIKELY TO CLIMB TO THEIR HIGHEST OF THE
SEASON SO FAR, HEAT ADVISORIES ARE IN EFFECT FOR PORTIONS OF
WESTERN OREGON AND THE INTERIOR COUNTIES OF FAR NORTHERN
CALIFORNIA. MEANWHILE, WITH ANOTHER DAY OF TEMPERATURES CLIMBING
WELL IN EXCESS OF 110F, EXCESSIVE HEAT WARNINGS REMAIN IN EFFECT
ACROSS THE LOWER DESERTS OF ARIZONA AND SOUTHEASTERN CALIFORNIA.
SEASONAL TO ABOVE-AVERAGE TEMPERATURES WILL CONTINUE ACROSS THE
SOUTHERN PLAINS AND THROUGH MUCH OF THE EASTERN U.S. MORE TYPICAL
SUMMERTIME SCATTERED THUNDERSTORMS ARE EXPECTED TO LINGER ACROSS
THE SOUTHERN TIER STATES. MEANWHILE, A LOW PRESSURE WAVE ALONG A
SLOW-MOVING FRONT WILL TRIGGER ADDITIONAL SHOWERS AND
THUNDERSTORMS TODAY ACROSS NEW ENGLAND. THE WAVE TOGETHER WITH
THE FRONT WILL WEAKEN FURTHER AND BECOME DIFFUSED OVER THE NEXT
COUPLE OF DAYS. MUCH OF THE NORTHEAST AND THE MID-ATLANTIC WILL
SEE DECREASING RAIN CHANCES OVER THE NEXT COUPLE OF DAYS
ESPECIALLY OVER NEW ENGLAND, ALTHOUGH SOME ISOLATED THUNDERSTORMS
COULD STILL PRODUCE LOCALLY HEAVY RAIN IN THESE AREAS.
KONG/PEREIRA
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