162
FXUS01 KWBC 192007
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
307 PM EST TUE NOV 19 2024
VALID 00Z WED NOV 20 2024 - 00Z FRI NOV 22 2024
...POWERFUL PACIFIC STORM TO IMPACT THE WEST COAST WITH HEAVY
RAIN, LIFE THREATENING FLOODING, WIND AND HIGHER ELEVATION
MOUNTAIN SNOW BEGINNING TONIGHT...
...HEAVY SNOW WITH GUSTY WINDS FOR NORTH DAKOTA INTO NORTHWESTERN
MINNESOTA INTO WEDNESDAY...
...LOCALLY HEAVY SNOW FOR THE ALLEGHENY MOUNTAINS OF WEST VIRGINIA
AND PENNSYLVANIA WITH LIGHTER ACCUMULATIONS POSSIBLE FOR
SURROUNDING PORTIONS OF THE MIDWEST INTO INTERIOR NEW YORK...
AN ACTIVE WEATHER PATTERN WILL UNFOLD ACROSS THE LOWER 48 THIS
WEEK WITH AREAS OF HEAVY RAIN, SNOW AND WIND. FIRST, A RAPIDLY
INTENSIFYING SURFACE LOW WILL NEAR THE PACIFIC NORTHWEST THIS
EVENING AND TONIGHT. WHILE THE SURFACE LOW SHOULD REMAIN ABOUT 300
MILES OFFSHORE THE WASHINGTON COAST, THE TIGHT PRESSURE GRADIENT
WILL RESULT IN DAMAGING WINDS FROM NORTHERN CALIFORNIA INTO
WESTERN WASHINGTON. WIND GUSTS OF 60-70 MPH (LOCALLY HIGHER) ARE
EXPECTED ALONG THE COAST AND INTO MOUNTAINOUS PORTIONS OF THE
REGION.
A MULTI-DAY HEAVY RAINFALL EVENT WILL IMPACT NORTHERN CALIFORNIA
INTO SOUTHWESTERN OREGON BEGINNING TONIGHT, CONTINUING INTO FRIDAY
AS AN ATMOSPHERIC RIVER STALLS IN AND AROUND NORTHERN CALIFORNIA.
RAINFALL ACCUMULATIONS OVER 10 INCHES ARE LIKELY FOR PORTIONS OF
NORTHERN CALIFORNIA INTO FAR SOUTHWESTERN OREGON THROUGH FRIDAY
MORNING WHICH WILL LEAD TO FLOODING RAINFALL AND AREAS OF FLASH
FLOODING, ESPECIALLY ACROSS SENSITIVE BURN SCARS AND ANY URBAN
LOCATIONS. WPC HAS ISSUED A HIGH RISK (LEVEL 4/4) OF EXCESSIVE
RAINFALL ACROSS PARTS OF NORTHWEST CALIFORNIA ON THURSDAY IN ORDER
TO FURTHER HIGHLIGHT THE FLOODING THREAT. INTO THE MOUNTAINS,
HEAVY SNOW AND STRONG WINDS WILL LEAD TO BLIZZARD CONDITIONS FOR
PORTIONS OF THE CASCADES INTO THE NORTHERN SIERRA NEVADA.
RESIDENTS AND VISITORS THROUGHOUT THE NORTHWEST ARE URGED TO HAVE
MULTIPLE WAYS TO RECEIVE WARNINGS, LISTEN TO ADVICE FROM LOCAL
OFFICIALS, AND AVOID TRAVELING THROUGH HAZARDOUS WEATHER
CONDITIONS IF POSSIBLE.
OVER THE NORTH-CENTRAL U.S., AN ONGOING STORM SYSTEM WILL CONTINUE
THREATS FOR GUSTY WINDS AND SNOWFALL FROM NORTHEASTERN MONTANA
INTO NORTHWESTERN MINNESOTA INTO WEDNESDAY BEFORE TAPERING OFF
WEDNESDAY NIGHT . AS A SURFACE LOW SLOWLY TRACKS NORTH FROM
MINNESOTA TONIGHT, COLDER AIR IS EXPECTED TO ALLOW A CHANGEOVER TO
SNOW FOR MOST REGIONS WITH ADDITIONAL SNOWFALL ACCUMULATIONS OF
3-6 INCHES (LOCALLY HIGHER) FOR NORTHERN/EASTERN NORTH DAKOTA.
LIGHT TO LOCALLY MODERATE SNOWFALL WILL ALSO IMPACT NORTHWESTERN
MINNESOTA AND NORTHEASTERN SOUTH DAKOTA. WINDS COMBINED WITH
FALLING SNOW OR SNOW ALREADY ON THE GROUND WILL REDUCE VISIBILITY
AND RESULT IN HAZARDOUS TRAVEL CONDITIONS.
ACROSS THE MIDWEST AND NORTHEAST, AS THE UPPER LEVEL STORM SYSTEM
FROM THE NORTH-CENTRAL U.S. MOVES EASTWARD, COLDER TEMPERATURES
AND AREAS OF SNOW ARE EXPECTED FOR PORTIONS OF THE MIDWEST,
PENNSYLVANIA AND INTERIOR NEW YORK STARTING LATE WEDNESDAY INTO
THURSDAY. LOCALLY HEAVY SNOW WITH ACCUMULATIONS IN EXCESS OF 6
INCHES SHOULD BE EXPECTED FOR THE HIGHER ELEVATIONS OF THE CENTRAL
APPALACHIANS FROM WEST VIRGINIA INTO PENNSYLVANIA BEGINNING
THURSDAY AND CONTINUING INTO THE NIGHT.
OTTO
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