411  
FXUS01 KWBC 200755  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
254 AM EST SAT JAN 20 2018  
 
VALID 12Z SAT JAN 20 2018 - 12Z MON JAN 22 2018  
 
   
..PRECIPITATION TO SPREAD SOUTHWESTERN U.S. THIS WEEKEND
 
 
...HEAVY SNOWS POSSIBLE FOR PORTIONS OF THE GREAT BASIN NORTHERN  
AND CENTRAL ROCKIES SATURDAY...  
 
...STRONG WINTER STORM EXPECTED TO DEVELOP OVER THE CENTRAL U.S.  
BY SUNDAY...  
   
..ABOVE NORMAL TEMPERATURES PERSISTING ACROSS THE EAST
 
 
A WELL-DEFINED COLD FRONT AND ITS ASSOCIATED AREA OF PRECIPITATION  
WILL CONTINUE TO PUSH SOUTHEAST INTO THE SOUTHWESTERN U.S. A VAST  
AREA SPANNING FROM THE SIERRA NEVADAS, NORTHERN ARIZONA AND  
NORTHWARD TO THE ROCKIES IN COLORADO WILL HAVE A MIX OF RAIN AND  
SNOW TODAY, TURNING TO MOSTLY SNOW BY THIS EVENING AND THROUGH  
SUNDAY. THE HEAVIEST SNOW ACCUMULATIONS WILL LIKELY OCCUR OVER THE  
MOUNTAINS OF SOUTHWEST WYOMING, UTAH AND EASTERN NEVADA THIS  
AFTERNOON. AND AS THE FRONT PROGRESSES EASTWARD, SO WILL THE  
HEAVIEST PRECIPITATION. LOCALLY HEAVY SNOW IS FORECAST FOR THE  
CENTRAL AND SOUTHERN ROCKIES.  
 
AN AREA OF LOW PRESSURE IS EXPECTED TO STRENGTHEN OVER THE  
SOUTHERN HIGH PLAINS TONIGHT AND THEN TRACK NORTHEAST INTO  
MIDWEST. IN THE COLD SECTOR, AN EXPANSIVE SHIELD OF SNOW WILL SPAN  
FROM THE ROCKIES INTO THE CENTRAL HIGH PLAINS BY TONIGHT, REACHING  
THE UPPER MIDWEST ON SUNDAY. SNOWFALL INTENSITY WILL BE MODERATE  
TO HEAVY AT TIMES AND ACCOMPANIED BY GUSTY WINDS. A WINTER STORM  
WATCH IS IN EFFECT FOR EASTERN WYOMING AND COLORADO TO NORTHERN  
WISCONSIN. FURTHER SOUTH AND AHEAD OF THE LOW'S TRAILING COLD  
FRONT, EXPECT SHOWERS AND THUNDERSTORMS TO DEVELOP, INCREASING IN  
COVERAGE AND INTENSITY ACROSS EASTERN OKLAHOMA AND TEXAS INTO THE  
MID AND LOWER MISSISSIPPI VALLEY SUNDAY AFTERNOON AND EVENING.  
 
AN ACTIVE WET PATTERN WILL PERSIST THIS WEEKEND AND INTO EARLY  
NEXT ACROSS THE PACIFIC NORTHWEST. A COUPLE OF FRONTS WILL PASS  
THROUGH THE REGION, SPREADING WIDESPREAD RAIN AND MOUNTAIN SNOW AS  
IT HEADS TOWARD THE INTERMOUNTAIN WEST. HEAVY SNOW WILL BE  
POSSIBLE FOR PORTIONS OF THE CASCADES OVER THE NEXT FEW DAYS.  
TEMPERATURES WILL BE NEAR OR BELOW NORMAL ACROSS THE WESTERN  
STATES.  
 
FOR MUCH OF THE EAST COAST, EXPECT ABOVE NORMAL TEMPERATURES TO  
STICK AROUND FOR A FEW DAYS. NUMEROUS LOCATIONS WILL HAVE MAXIMUM  
TEMPERATURES REMAINING 10-20 DEGREES ABOVE THEIR CLIMATOLOGICAL  
NORMS.  
 
CAMPBELL/PEREIRA  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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