555
FXUS01 KWBC 190726
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
225 AM EST TUE DEC 19 2023
VALID 12Z TUE DEC 19 2023 - 12Z THU DEC 21 2023
...THERE IS A SLIGHT RISK OF EXCESSIVE RAINFALL OVER PARTS OF
CENTRAL/SOUTHERN CALIFORNIA ON WEDNESDAY...
...LAKE-EFFECT SNOW DOWNWIND OF THE LOWER GREAT LAKES AND UPSLOPE
SNOW OVER PARTS OF THE CENTRAL APPALACHIANS...
..RAIN FOR MOST OF THE WEST COAST
A FRONT MOVING ONSHORE OVER THE WEST COAST ON TUESDAY WILL
DISSIPATE BY TUESDAY EVENING. A SECOND FRONT WILL COME CLOSE TO
THE WEST COAST BY WEDNESDAY MORNING AND THEN MOVE SOUTHWARD OVER
THE PACIFIC BY THURSDAY. MOISTURE ASSOCIATED WITH THE FRONTS WILL
STREAM INTO THE WEST COAST, PRODUCING RAIN OVER MOST OF THE AREA.
IN ADDITION, LOCALLY HEAVY SNOW WILL DEVELOP OVER THE HIGHEST
ELEVATIONS OF THE SIERRA NEVADA MOUNTAINS AND LIGHTER SNOW OVER
THE HIGHEST ELEVATIONS OF THE CASCADES AND PARTS OF IDAHO AND
NEVADA. THE RAIN WILL BE MODERATE TO HEAVY AT TIMES. THEREFORE,
THE WPC HAS ISSUED A MARGINAL RISK OF EXCESSIVE RAINFALL OVER
PARTS OF NORTHERN/ CENTRAL CALIFORNIA THROUGH WEDNESDAY MORNING.
THE ASSOCIATED HEAVY RAIN WILL CREATE LOCALIZED AREAS OF FLASH
FLOODING, AFFECTING AREAS THAT EXPERIENCE RAPID RUNOFF WITH HEAVY
RAIN.
ON WEDNESDAY, THE THREAT OF EXCESSIVE RAINFALL INCREASES AS A
PLUME OF MOISTURE STREAMS INTO SOUTHERN CALIFORNIA. THEREFORE, THE
WPC HAS ISSUED A SLIGHT RISK OF EXCESSIVE RAINFALL OVER PARTS OF
CENTRAL/SOUTHERN CALIFORNIA FROM WEDNESDAY INTO THURSDAY MORNING.
THE ASSOCIATED HEAVY RAIN WILL CREATE MAINLY LOCALIZED AREAS OF
FLASH FLOODING, WITH URBAN AREAS, ROADS, SMALL STREAMS, NARROW
CRAYONS/GULLIES, AND BURN SCARS THE MOST VULNERABLE. MOREOVER,
LOCALLY HEAVY SNOW WILL CONTINUE OVER THE HIGHEST ELEVATIONS OF
THE SIERRA NEVADA MOUNTAINS.
MEANWHILE, UPPER-LEVEL ENERGY OVER THE NORTHEAST ON TUESDAY MOVES
EASTWARD OUT OVER THE WESTERN ATLANTIC BY WEDNESDAY. THE ENERGY
AND COLD AIR WILL AID IN CREATING LAKE-EFFECT SNOW DOWNWIND OF THE
LOWER GREAT LAKES AND UPSLOPE SNOW OVER PARTS OF THE CENTRAL
APPALACHIANS ON TUESDAY, ENDING OVERNIGHT TUESDAY.
ELSEWHERE, RETURN FLOW OFF THE GULF OF MEXICO WILL SLOWLY MOISTEN
THE AIR OVER THE CENTRAL/SOUTHERN PLAINS, PRODUCING SCATTERED RAIN
OVER THE REGION OVERNIGHT WEDNESDAY INTO THURSDAY.
ZIEGENFELDER
GRAPHICS AVAILABLE AT
HTTPS://WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
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