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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