555
FXUS01 KWBC 131956
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
355 PM EDT SAT MAY 13 2023
VALID 00Z SUN MAY 14 2023 - 00Z TUE MAY 16 2023
...MUCH ABOVE-AVERAGE TEMPERATURES EXPECTED TO CONTINUE ACROSS THE
WESTERN U.S., INCLUDING RECORD-BREAKING HEAT OVER PORTIONS OF THE
PACIFIC NORTHWEST ON SUNDAY...
...ADDITIONAL HEAVY RAIN AND FLOODING POSSIBLE FOR PARTS OF TEXAS
AND OKLAHOMA INTO EARLY NEXT WEEK...
...SEVERE STORMS EXPECTED FOR PARTS OF THE MID MISSISSIPPI VALLEY
INTO SATURDAY EVENING...
HIGH PRESSURE IN THE UPPER LEVELS OF THE ATMOSPHERE WILL CONTINUE
TO SUPPORT WELL-ABOVE NORMAL TEMPERATURES ACROSS THE WESTERN U.S.,
WITH RECORD-BREAKING HEAT EXPECTED ACROSS PORTIONS OF THE PACIFIC
NORTHWEST. HEAT ADVISORIES REMAIN IN EFFECT FOR PORTIONS OF
WESTERN WASHINGTON AND OREGON, INCLUDING THE SEATTLE AND PORTLAND
METRO REGIONS, WHERE DAYTIME TEMPERATURES ARE FORECAST TO ONCE
AGAIN REACH 20-30 DEGREES ABOVE NORMAL ON SUNDAY. WHILE
TEMPERATURES ARE LIKELY TO REMAIN WELL ABOVE AVERAGE, AN UPPER
LEVEL LOW DRIFTING NORTH INTO THE REGION IS EXPECTED TO INCREASE
THE CHANCE FOR SHOWERS AND THUNDERSTORMS AND BRING SOME RELIEF
FROM THE EARLY SEASON HEAT WAVE ON MONDAY. HEAT ADVISORIES ARE IN
EFFECT INTO MONDAY FOR CALIFORNIA'S SAN JOAQUIN VALLEY, WHERE HIGH
TEMPERATURES ARE FORECAST TO REACH INTO THE MID TO UPPER 90S EACH
DAY.
FARTHER TO THE EAST, A SERIES OF SLOW-MOVING UPPER-LEVEL
DISTURBANCES WILL HELP TO PRODUCE AREAS OF SHOWERS AND
THUNDERSTORMS AND KEEP TEMPERATURES MUCH COOLER ACROSS THE
SOUTHERN AND CENTRAL PLAINS THROUGH THE WEEKEND, WITH WELL-BELOW
TEMPERATURES LIKELY ALONG THE HIGH PLAINS INTO THE FOOTHILLS.
FLOOD WATCHES REMAIN IN EFFECT FOR PORTIONS OF TEXAS AND OKLAHOMA,
WHERE ADDITIONAL PERIODS OF HEAVY RAIN WILL REMAIN POSSIBLE
THROUGH THE REMAINDER OF THE WEEKEND.
FLOODING AND SEVERE THUNDERSTORMS ARE ALSO POSSIBLE FARTHER TO THE
NORTH ACROSS PORTIONS OF THE UPPER AND MID MISSISSIPPI VALLEY.
SEVERE STORMS ARE NOW DEVELOPING OVER THE REGION, WITH THE THREAT
EXPECTED TO CONTINUE INTO THIS EVENING. THESE STORMS HAVE THE
POTENTIAL TO PRODUCE DAMAGING WINDS, LARGE HAIL, AND A FEW
TORNADOES. HEAVY RAIN IS ALSO POSSIBLE WITH A FLOOD WATCH IN
EFFECT ACROSS SOUTHWESTERN MINNESOTA AND A SMALL PORTION OF
NORTHWESTERN IOWA. BY LATE SUNDAY, HIGH PRESSURE IS FORECAST TO
BRING DRIER AND MORE SETTLED WEATHER TO THE NORTHERN PLAINS AND
UPPER MIDWEST.
IN THE EASTERN U.S., A COLD FRONT WILL CONTINUE TO DROP SOUTH
THROUGH THE MID ATLANTIC INTO THE SOUTHEAST, WITH SHOWERS AND
STORMS POSSIBLE INTO EARLY NEXT WEEK ACROSS PORTIONS OF THE
SOUTHERN MID ATLANTIC AND THE SOUTHEAST. COOLER AND DRIER
CONDITIONS ARE FORECAST FOR THE NORTHEAST ON SUNDAY, WITH FROST
ADVISORIES IN EFFECT FOR SUNDAY MORNING FOR PORTIONS OF FAR
NORTHERN NEW YORK AND VERMONT.
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