243
FXUS01 KWBC 260751
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
250 AM EST TUE JAN 26 2021
VALID 12Z TUE JAN 26 2021 - 12Z THU JAN 28 2021
...HEAVY SNOW LIKELY ACROSS HIGHER ELEVATIONS OF THE SOUTHWEST AND
ACROSS PORTIONS OF THE CENTRAL PLAINS AND MIDWEST THROUGH
TUESDAY...
...LIGHT SNOW TO IMPACT PARTS OF THE NORTHERN MID-ATLANTIC AND
NORTHEAST THROUGH TUESDAY, ACCUMULATING ICE/FREEZING RAIN POSSIBLE
IN THE CENTRAL APPALACHIANS...
...HEAVY LOWER ELEVATION RAIN TO MOVE INTO NORTHERN/CENTRAL
CALIFORNIA TUESDAY NIGHT ALONG WITH EXTREME SNOWFALL AMOUNTS
ACROSS THE SIERRA NEVADA...
MULTIPLE SYSTEMS ACROSS THE COUNTRY ARE PRODUCING IMPACTFUL
PRECIPITATION AND WILL CONTINUE TO DO SO OVER THE NEXT FEW DAYS.
THE LEADING LOW PRESSURE SYSTEM IS LIFTING TROUGH THE MISSISSIPPI
AND TENNESSEE VALLEYS. LINES OF THUNDERSTORMS ARE TRACKING AHEAD
OF THE COLD FRONT WITHIN THE WARM SECTOR OVER THE GULF STATES,
TENNESSEE VALLEY AND PARTS OF THE SOUTHEAST AND SOUTHERN
MID-ATLANTIC. PERIODS OF MODERATE TO HEAVY RAINFALL MAY LEAD TO
EXCESSIVE RAINFALL AND/OR LOCALIZED FLASH FLOODING CONDITIONS FOR
PARTS OF THE EASTERN TENNESSEE VALLEY AND CENTRAL APPALACHIANS
THROUGH TUESDAY MORNING. FREEZING RAIN/SLEET MAY MAY BE PRESENT
FROM NORTHERN MISSOURI TO THE NORTHERN MID-ATLANTIC/SOUTHERN
NORTHEAST AND LEAD TO ACCUMULATIONS UP TO 0.50 INCH. THE HIGHEST
ACCUMULATIONS WILL LIKELY OCCUR IN THE HIGHER TERRAIN OF EASTERN
WEST VIRGINIA, WESTERN VIRGINIA, WESTERN MARYLAND AND SOUTHWEST
PENNSYLVANIA; TRAVEL MAY QUICKLY BECOME HAZARDOUS. SNOW IS
EXPECTED ON THE NORTHERN PERIPHERY OF THE PRECIPITATION SHIELD
OVER THE OHIO VALLEY, GREAT LAKES AND NORTHEAST. THIS SYSTEM WILL
CONTINUE MOVING EAST THROUGH WEDNESDAY BEFORE MOVING OFFSHORE.
OVER A FOOT OF SNOW COULD FALL ACROSS SOUTHEAST NEBRASKA AND
SOUTHWEST IOWA, THIS INCLUDES LINCOLN AND OMAHA, NEBRASKA.
NUMEROUS WINTER WEATHER ADVISORIES AND WINTER STORM WARNINGS HAVE
BEEN ISSUED FOR THE IMPACTED REGIONS.
SCATTERED TO WIDESPREAD SNOW IS FALLING ACROSS PARTS OF ARIZONA,
UTAH AND PARTS OF THE SOUTHWEST AS A LOW PRESSURE SYSTEM TRACKS
THROUGH THE GREAT BASIN. THE HIGHER ELEVATIONS WILL LIKELY HAVE
HEAVY SNOW WITH THIS SYSTEM, POSSIBLY YIELDING A FOOT OR MORE OF
ACCUMULATIONS. TRAVEL THROUGH THIS PART OF THE COUNTRY MAY BE
HAZARDOUS. LIGHT SNOW CAN BE EXPECTED FROM THE CENTRAL PLAINS TO
THE LOWER OHIO VALLEY. MODERATE SNOWFALL AMOUNTS UP TO 6 INCHES
WILL BE POSSIBLE WEDNESDAY NIGHT ACROSS THE SOUTHERN APPALACHIANS.
A ROBUST LOW PRESSURE SYSTEM WILL PUSH ONSHORE CALIFORNIA BY
TUESDAY NIGHT AND WILL USHER IN GUSTY WINDS, HEAVY RAIN FOR
COASTAL AND LOWER ELEVATION AREAS AND MOUNTAIN SNOW ON WEDNESDAY.
SNOW LEVELS ACROSS NORTHERN CALIFORNIA ARE FORECAST TO START AS
LOW AS 500 TO 2500 FEET, BEFORE SLOWLY RISING WEDNESDAY. WITH
SEVERAL INCHES OF RAINFALL EXPECTED ACROSS PARTS OF CENTRAL AND
SOUTHERN CALIFORNIA, WPC HAS IDENTIFIED A MODERATE RISK AREA FOR
EXCESSIVE RAINFALL AND DEBRIS FLOWS FROM NEARBY BURN SCARS WILL BE
A CONCERN ON WEDNESDAY ALONG THE CENTRAL CALIFORNIA COASTLINE AS
UPWARDS OF 7 TO 10 INCHES OF RAIN COULD FALL. HIGHER UP IN
ELEVATION, WHITEOUT CONDITIONS DUE TO EXTREMELY HEAVY SNOWFALL
RATES ARE POSSIBLE ACROSS THE SIERRA NEVADA. SEVERAL FEET OF SNOW
WILL ADD UP THROUGH WEDNESDAY NIGHT, WITH ROAD CLOSURES AND TRAVEL
DELAYS LIKELY.
CAMPBELL
GRAPHICS AVAILABLE AT
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
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