354
FXUS01 KWBC 020743
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
342 AM EDT TUE MAY 02 2023
VALID 12Z TUE MAY 02 2023 - 12Z THU MAY 04 2023
...MUCH BELOW AVERAGE TEMPERATURES EXPECTED ACROSS GREAT
LAKES/MIDWEST ON TUESDAY BEFORE SPREADING EASTWARD INTO
NORTHEAST/MID-ATLANTIC ON WEDNESDAY...
...SNOW TO DIMINISH IN UPPER PENINSULA OF MICHIGAN ON TUESDAY,
WHILE MODERATE TO HEAVY SNOW CONTINUES ACROSS WEST VIRGINIA
APPALACHIANS THROUGH WEDNESDAY...
...COOL AND UNSETTLED WEATHER FOR CALIFORNIA AND SOUTHWEST THIS
WEEK; WARM AND DRY CONDITIONS FURTHER NORTH AND INLAND THROUGHOUT
PACIFIC NORTHWEST AND INTERMOUNTAIN WEST...
THIS WEEK'S PRIMARY WEATHER HEADLINE WILL BE THE OMEGA BLOCK
PATTERN THAT HAS SET UP ACROSS NORTH AMERICA, WITH UNSEASONABLY
COOL AND DAMP CONDITIONS EXPECTED ACROSS BOTH LOWER 48 COASTS AND
MUCH-ABOVE-AVERAGE TEMPERATURES THROUGHOUT THE CENTRAL U.S. AS THE
ANOMALOUS UPPER-LEVEL LOW AND ASSOCIATED SURFACE LOW THAT HAS
REMAINED NEARLY STATIONARY ACROSS THE GREAT LAKES REGION BEGINS TO
MEANDER EASTWARD AND WEAKEN ON TUESDAY, CONDITIONS WILL IMPROVE
ACROSS THE UPPER PENINSULA (U.P.) OF MICHIGAN, WHERE LOCALIZED
AREAS HAVE REPORTED UPWARDS OF 12-18 INCHES OF SNOW OVER THE LAST
72 HOURS. IN THE MEANTIME, AN ADDITIONAL 6-10" IS POSSIBLE,
ESPECIALLY IN THE HIGHER TERRAIN OF THE INTERIOR U.P., THROUGH
TUESDAY AFTERNOON. FURTHER EAST, MODERATE TO HEAVY SNOW HAS ALSO
BEEN FALLING ACROSS THE WEST VIRGINIA APPALACHIANS, WITH LOCALIZED
WINTER STORM WARNINGS AND WINTER WEATHER ADVISORIES IN EFFECT
THROUGH TUESDAY AND WEDNESDAY, RESPECTIVELY, AS COLD AIR ADVECTS
SOUTHWARD ACROSS THE MOUNTAIN RANGE, PRODUCING HIGH-ELEVATION
SNOWFALL AMOUNTS UP TO 12".
FURTHERMORE, A BROADER AREA OF MUCH-BELOW-AVERAGE TEMPERATURES
(15-25 DEGREES F BELOW AVERAGE), ENCOMPASSING MUCH OF THE GREAT
LAKES REGION, OHIO VALLEY, AND THE APPALACHIANS, WILL BE POSSIBLE
ON TUESDAY, AS DAYTIME HIGHS REMAIN IN THE LOW 40S AND NUMEROUS
LOCATIONS APPROACH OR BREAK DAILY RECORD LOW MAXIMUM TEMPERATURES.
AS THE UPPER LOW BEGINS TO PUSH NORTHEASTWARD, THE BELOW-AVERAGE
TEMPERATURES WILL SPILL INTO THE MID-ATLANTIC AND NORTHEAST ON
WEDNESDAY, WITH NIGHTTIME LOWS DIPPING INTO THE LOW 40S ACROSS
NEARLY THE ENTIRETY OF THE I-95 URBAN CORRIDOR. MOREOVER,
CONDITIONS WILL REMAIN DAMP AS SHOWERS ASSOCIATED WITH THE UPPER
LOW CONTINUE THROUGH THURSDAY.
ELSEWHERE, A COOL AND UNSETTLED WEATHER PATTERN IS CURRENTLY
SPREADING EASTWARD ACROSS THE WEST COAST AS AN UPPER-LEVEL LOW
SLOWLY TRACKS SOUTHWARD ALONG THE CALIFORNIA SHORELINE THROUGH
THURSDAY, RESULTING IN INCREASED SHOWER AND HIGH-ELEVATION SNOW
CHANCES AND BELOW-AVERAGE TEMPERATURES. DAYTIME TEMPERATURES WILL
REMAIN IN THE 50S AND 60S ACROSS MUCH OF CALIFORNIA ON TUESDAY AND
WEDNESDAY, WITH THE UNSEASONABLY COOL WEATHER EXPANDING EASTWARD
INTO THE SOUTHWEST ON THURSDAY. FURTHER NORTH AND INLAND, GUSTY
SOUTHERLY WINDS AND WELL ABOVE AVERAGE TEMPERATURES ARE
ANTICIPATED FOR MUCH OF THE INTERMOUNTAIN WEST AND PACIFIC
NORTHWEST, WITH WARM WEATHER ALSO SPREADING INTO THE NORTHERN AND
CENTRAL ROCKIES AND NORTHERN HIGH PLAINS BY MIDWEEK. 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
ON TUESDAY, SHOWERS AND THUNDERSTORMS WILL BEGIN TO OVERSPREAD
MUCH OF THE ROCKIES.
RUSSELL
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