112  
FXUS01 KWBC 160647  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
147 AM EST SUN DEC 16 2018  
 
VALID 12Z SUN DEC 16 2018 - 12Z TUE DEC 18 2018  
 
...STRONG STORM SYSTEMS FOR BOTH THE WEST COAST AND EAST COAST  
THIS WEEKEND...  
 
THERE WILL BE TWO MAIN WEATHER FEATURES OF INTEREST THROUGH THE  
WEEKEND AND INTO MONDAY. THE FIRST WILL BE A WELL DEFINED LOW  
PRESSURE SYSTEM SLOWLY TRACKING EASTWARD ACROSS THE MID-ATLANTIC  
REGION AND SLOWLY EXITING OUT TO SEA BY SUNDAY EVENING. THE  
RESULT HAS BEEN COPIOUS AMOUNTS OF RAINFALL FROM THE SOUTHEAST  
COAST AND OHIO VALLEY TO SOUTHERN NEW ENGLAND. IN FACT, THE  
RAINFALL FROM THIS EVENT ALONE HAS RESULTED IN SOME CITIES ACROSS  
THE EAST COAST REGION SETTING NEW ANNUAL RAINFALL RECORDS. GIVEN  
THE WARMER NATURE OF THIS STORM SYSTEM, ANY WINTER WEATHER SHOULD  
BE RELEGATED TO THE HIGHER ELEVATIONS OF INTERIOR NEW NEW ENGLAND,  
AND ALL RAIN FOR THE MAJOR CITIES ALONG THE INTERSTATE 95 CORRIDOR.  
 
THE SECOND AREA OF INTEREST WILL BE THE WEST COAST STATES AS A  
POWERFUL PACIFIC STORM SYSTEM AFFECTS THE REGION THROUGH SUNDAY.  
ALTHOUGH THE MAIN SURFACE LOW WILL BE WELL TO THE NORTH ACROSS THE  
GULF OF ALASKA, THE TRAILING COLD FRONT WILL HAVE ENOUGH OF A  
PRESSURE GRADIENT WITH IT TO GENERATE STRONG WINDS AND EXTREMELY  
ROUGH SURF FROM NORTHERN CALIFORNIA TO WESTERN WASHINGTON, AND  
VARIOUS WIND AND SURF RELATED BULLETINS HAVE BEEN ISSUED REGARDING  
THESE HAZARDS. HEAVY RAIN AND HIGH MOUNTAIN SNOW ARE ALSO  
EXPECTED AS THE FRONT MOVES INLAND, PARTICULARLY FOR NORTHERN  
CALIFORNIA AND NORTHWEST WASHINGTON. THERE WILL BE A BRIEF  
RESPITE ON MONDAY BEFORE THE NEXT SYSTEM ARRIVES ON TUESDAY WITH  
MORE INCLEMENT WEATHER.  
 
ELSEWHERE ACROSS THE CONTINENTAL U.S., SUNNY TO PARTLY CLOUDY  
CONDITIONS ARE EXPECTED FROM THE ROCKIES TO THE OHIO VALLEY AND  
FLORIDA AS AN EXPANSIVE HIGH PRESSURE RIDGE GOVERNS THE WEATHER  
PATTERN THROUGH THE WEEKEND. OVERALL, TEMPERATURES ARE EXPECTED  
TO BE NEAR TO ABOVE AVERAGE FOR THE MAJORITY OF THE CONTINENTAL  
U.S. THROUGH TUESDAY MORNING WITH NO MAJOR INCURSIONS OF ARCTIC  
AIR MASSES EXPECTED.  
 
D. HAMRICK  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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