354  
FXUS01 KWBC 270757  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
257 AM EST MON NOV 27 2017  
 
VALID 12Z MON NOV 27 2017 - 12Z WED NOV 29 2017  
   
..HEAVY RAIN AND SNOW FOR THE SIERRAS
 
 
...HEAVY RAIN POSSIBLE OVER THE PACIFIC NORTHWEST COAST AND HEAVY  
SNOW FOR THE CASCADES...  
   
..SNOW FOR AREAS DOWNWIND OF LAKE ONTARIO
 
 
...TEMPERATURES WILL BE 20 TO 30 DEGREES ABOVE AVERAGE FOR  
CENTRAL/NORTHERN PLAINS AND PARTS OF THE SOUTHERN HIGH PLAINS...  
 
A LOW PRESSURE SYSTEM AND ASSOCIATED SURFACE COLD FRONT WILL PASS  
THROUGH EXIT THE ROCKIES AND MOVE EAST THROUGH THE NORTHERN AND  
CENTRALS PLAINS TODAY- WITH THE LEADING EDGE PASSING THROUGH THE  
GREAT LAKES AND THE NORTHEAST BY WEDNESDAY MORNING WHILE THE  
SOUTHERN EDGE SINKS SOUTHWARD AND STALLS OVER THE CENTRAL AND  
SOUTHERN PLAINS. PRIOR TO THE FRONTAL, TEMPERATURES TODAY ACROSS  
THE SOUTH-CENTRAL U.S. WILL BE WELL ABOVE AVERAGE.  
 
AS THE FRONT MOVES FURTHER INLAND ACROSS THE PACIFIC NORTHWEST THE  
SNOW LEVELS WILL LOWER FROM THE COAST TO THE INTERMOUNTAIN WEST.  
HEAVY SNOW IS EXPECTED OVER THE CASCADES EARLY THIS MORNING BEFORE  
DECREASING INTENSITY THIS AFTERNOON AND EVENING-- WITH SNOW  
ACCUMULATIONS INCREASING FOR PORTIONS OF THE NORTHERN ROCKIES BY  
TUESDAY. ALSO, THE RAIN OVER THE COASTAL AREAS OF PACIFIC  
NORTHWEST WILL INCREASE IN COVERAGE BY EXPANDING SOUTH INTO PARTS  
OF NORTHERN/CENTRAL CALIFORNIA. THERE WILL BE PERIODS OF HEAVY  
RAIN AND SNOW WILL ALSO DEVELOP OVER THE SIERRAS.  
 
A WEAK FRONT MOVING THROUGH THE LOWER GREAT LAKES AND NORTHEAST  
TODAY WILL PRODUCE LIGHT SNOW OVER PARTS OF THE LOWER GREAT LAKES  
INTO THE NORTHERN APPALACHIANS. COUNTIES EAST OF LAKE ONTARIO WILL  
HAVE SOME LAKE ENHANCEMENT OF THE SNOW TODAY. A WINTER WEATHER  
ADVISORY AND LAKESHORE FLOOD WARNING IS IN EFFECT. ELSEWHERE,  
UPPER-LEVEL ENERGY WILL MOVE OVER THE SOUTHERN TIP OF FLORIDA THIS  
AFTERNOON AND INTO TUESDAY; WHICH WILL AID IN PRODUCING SHOWERS  
AND THUNDERSTORMS OVER THE SOUTHERN TIP OF FLORIDA.  
 
CAMPBELL  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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