174
FXUS01 KWBC 030745
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
345 AM EDT WED MAY 03 2023
VALID 12Z WED MAY 03 2023 - 12Z FRI MAY 05 2023
...MUCH BELOW AVERAGE TEMPERATURES AND DAMP CONDITIONS EXPECTED
ACROSS GREAT LAKES AND NORTHEAST THROUGH THE END OF THE WORK
WEEK...
...COOL AND UNSETTLED WEATHER FOR CALIFORNIA AND SOUTHWEST ON
WEDNESDAY BEFORE EXPANDING NORTHWARD INTO PACIFIC NORTHWEST ON
THURSDAY...
...ABOVE-AVERAGE TEMPERATURES TO CONTINUE THROUGHOUT NORTHERN
INTERMOUNTAIN WEST AND HIGH PLAINS THROUGH FRIDAY...
...SHOWERS AND SEVERE THUNDERSTORMS POSSIBLE IN THE SOUTHERN
PLAINS ON THURSDAY...
UNSEASONABLY COOL WEATHER WILL CONTINUE THROUGH THE END OF THE
WORK WEEK ACROSS THE EASTERN THIRD OF THE COUNTRY AS AN UPPER-LOW
SLOWLY MEANDERS EASTWARD ACROSS THE GREAT LAKES REGION. WEDNESDAY
WILL FEATURE WIDESPREAD TEMPERATURE DEPARTURES OF 15-25 DEGREES
BELOW AVERAGE THROUGHOUT THE MID-ATLANTIC AND NORTHEAST, WITH
DAYTIME HIGH TEMPERATURES REMAINING IN THE 40S AND 50S, RESULTING
IN THE POTENTIAL FOR NUMEROUS LOCATIONS TO APPROACH OR BREAK DAILY
RECORD LOW MAXIMUM TEMPERATURES. THE COOL WEATHER WILL CONTINUE
INTO THURSDAY, ALBEIT RETURNING CLOSER TO NORMAL AS THE UPPER-LOW
WEAKENS AND SHIFTS OFFSHORE. MOREOVER, CONDITIONS WILL REMAIN DAMP
AS SCATTERED SHOWERS REMAIN POSSIBLE THROUGH FRIDAY THROUGHOUT THE
REGION.
ON THE OPPOSITE SIDE OF THE LOWER 48, AN UPPER-LOW CHURNING OFF
THE CALIFORNIA COASTLINE HAS LED TO A COOL AND UNSETTLED WEATHER
PATTERN SPREADING EASTWARD ACROSS THE WEST COAST. DAYTIME
TEMPERATURES WILL REMAIN IN THE 50S AND 60S ACROSS MUCH OF
CALIFORNIA ON WEDNESDAY AND THURSDAY, ACCOMPANIED BY INCREASED
CHANCES OF SHOWERS AND HIGH-ELEVATION SNOW. AS THE UPPER-LOW
SHIFTS EASTWARD, AS WELL AS AN ATTENDANT FRONTAL BOUNDARY, THE
BELOW-AVERAGE TEMPERATURES WILL EXPAND NORTHWARD INTO THE PACIFIC
NORTHWEST AND GREAT BASIN REGIONS ON FRIDAY. FURTHERMORE, THE
DEVELOPMENT OF SHOWERS AND THUNDERSTORMS AS SHORTWAVE ENERGY
ROUNDS THE BASE OF THE PREVIOUSLY MENTIONED UPPER-LEVEL TROUGH
WILL PRODUCE A BROAD SWATH OF 0.25" - 0.75" OF RAIN ON THURSDAY
THROUGHOUT MUCH OF THE GREAT BASIN AND PACIFIC NORTHWEST. THIS, IN
CONJUNCTION WITH SNOWMELT AND ALREADY SWOLLEN STREAMS AND RIVERS,
MAY LEAD TO ISOLATED INSTANCES OF RUNOFF ISSUES.
FURTHER INLAND, GUSTY SOUTHERLY WINDS AND WELL ABOVE AVERAGE
TEMPERATURES ARE ANTICIPATED FOR MUCH OF THE INTERMOUNTAIN WEST,
WITH WARM WEATHER SPREADING INTO THE NORTHERN AND CENTRAL ROCKIES
AND NORTHERN HIGH PLAINS BY THURSDAY. WIDESPREAD TEMPERATURE
ANOMALIES OF 15-25 DEGREES ABOVE AVERAGE WILL BE POSSIBLE AS
DAYTIME TEMPERATURES EXCEED 80F ACROSS MUCH OF THE REGION. AS A
RESULT, AREAS EXPERIENCING RIVER FLOODING DUE TO SNOWMELT ACROSS
THE GREAT BASIN AND INTERMOUNTAIN WEST CAN EXPECT MORE SIGNIFICANT
SNOWMELT THIS WEEK. AS THE FRONTAL BOUNDARY ASSOCIATED WITH THE
PERSISTENT UPPER-LEVEL TROUGHING PUSHES INLAND, SHOWERS AND
THUNDERSTORMS WILL BEGIN TO OVERSPREAD MUCH OF THE ROCKIES LATE
WEDNESDAY INTO EARLY THURSDAY.
IN THE SOUTHERN PLAINS, A STATIONARY FRONT WILL REMAIN DRAPED
ACROSS THE AREA THROUGH THURSDAY, THEN LIFT NORTHEAST AS A WARM
FRONT FROM THURSDAY NIGHT INTO FRIDAY. CONDITIONS ACROSS THE
REGION WILL BE FAVORABLE FOR THUNDERSTORMS EACH DAY, AND SCATTERED
SEVERE STORMS WILL BE POSSIBLE ON THURSDAY AFTERNOON AND EVENING
IN PARTS OF TEXAS AND OKLAHOMA WHERE THE STORM PREDICTION CENTER
HAS ISSUED A SLIGHT RISK OF SEVERE THUNDERSTORMS. SEVERE STORMS
WILL BE CAPABLE OF PRODUCING LARGE HAIL, DAMAGING WINDS, AND A
COUPLE OF TORNADOES.
RUSSELL/DOLAN
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