259  
FXUS01 KWBC 261942  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
242 PM EST TUE DEC 26 2017  
 
VALID 00Z WED DEC 27 2017 - 00Z FRI DEC 29 2017  
 
...FREEZING RAIN POSSIBLE OVER PARTS OF THE PACIFIC NORTHWEST WITH  
SNOW IN THE CASCADES AND NORTHERN ROCKIES...  
   
..GREAT LAKES TO EXPERIENCE LAKE EFFECT SNOW
 
 
   
..CHANCE FOR MIXED PRECIPITATION ACROSS PARTS OF THE SOUTHEAST
 
 
AS A STRONG PACIFIC FRONT BEGINS TO APPROACH THE PACIFIC NORTHWEST  
ON WEDNESDAY, MOISTURE WILL INCREASE ACROSS THE AREA. HOWEVER,  
EXPECT A DRAMATIC INCREASE IN MOISTURE BY THURSDAY AS THE FRONT  
BEGINS MOVING INTO THE REGION. THIS WILL ALLOW SNOW TO SPREAD  
ACROSS THE HIGHER ELEVATIONS OF THE CASCADES AND NORTHERN  
PLAINS--WITH POCKETS OF FREEZING RAIN POSSIBLE IN THE LOWER  
ELEVATIONS IN WESTERN WASHINGTON AND OREGON. LIGHTER AMOUNTS OF  
SNOWFALL ACCUMULATIONS ARE EXPECTED ON WEDNESDAY WITH STEADY  
INCREASE ON THURSDAY. THE HEAVIEST SNOW WILL OCCUR BEYOND THE  
SHORT TERM PERIOD. SEE WPC'S WINTER WEATHER PRODUCTS FOR MORE  
INFORMATION.  
 
AS WESTERLY WINDS MOVE ACROSS THE GREAT LAKES REGION, COLD AIR  
WILL TRAVEL OVER THE LAKES AND GIVE WAY TO HEAVY LAKE EFFECT SNOW  
DOWNWIND OF THE LAKES. AS AN ARCTIC HIGH PRESSURE SHIFTS TOWARD  
THE GREAT LAKES ON THURSDAY, CONDITIONS BECOME LESS FAVORABLE FOR  
HEAVY LAKE EFFECT SNOW--HOWEVER SOME SNOW COULD CONTINUE TO  
LINGER.  
 
SHOWERS WILL CONTINUE ACROSS THE WESTERN GULF COAST AS SOUTHERLY  
FLOW FROM A WARM FRONT TRANSPORTS MOISTURE FROM THE GULF OF MEXICO  
INTO THE REGION. AS THE FRONTAL WAVE PROGRESSES EASTWARD ON  
WEDNESDAY, MOST OF THE PRECIPITATION WILL ALSO SHIFT TOWARD THE  
CENTRAL GULF COAST. PRECIPITATION WILL CONTINUE ACROSS THE  
SOUTHEAST AND THE SOUTHERN PORTIONS OF SOUTH CAROLINA. HOWEVER,  
WITH A SHALLOW COLD AIRMASS IN PLACE--MIXED PRECIPITATION AND/OR  
FREEZING RAIN COULD OCCUR IN PARTS OF CENTRAL GEORGIA TO  
SOUTHEASTERN SOUTH CAROLINA.  
 
REINHART  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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