646  
FXUS01 KWBC 170657  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
156 AM EST MON DEC 17 2018  
 
VALID 12Z MON DEC 17 2018 - 12Z WED DEC 19 2018  
 
...UNSETTLED FOR THE NORTHEAST AND PACIFIC NORTHWEST WITH MAINLY  
DRY CONDITIONS FOR THE CENTRAL STATES...  
 
THE OCCLUDED LOW PRESSURE SYSTEM THAT HAS AFFECTED THE EASTERN  
U.S. WITH HEAVY RAIN OVER THE PAST COUPLE OF DAYS IS NOW MAINLY  
OFFSHORE. HOWEVER, THERE WILL BE ENOUGH WRAP-AROUND MOISTURE TO  
THE NORTHWEST OF THE LOW TO GENERATE A BAND OF MODERATE TO HEAVY  
SNOW ACROSS NORTHERN NEW ENGLAND, PARTICULARLY EASTERN MAINE WHERE  
4 TO 8 INCHES OF SNOW IS LIKELY, WITH LOCALLY HIGHER AMOUNTS.  
MAINLY RAIN IS EXPECTED CLOSER TO THE NEW ENGLAND COAST BEFORE  
DRIER WEATHER ARRIVES ON TUESDAY.  
 
THE WEATHER PATTERN CONTINUES TO REMAIN QUITE ACTIVE FOR THE WEST  
COAST AND INTERMOUNTAIN WEST AS TWO SEPARATE EVENTS AFFECT THE  
REGION. THE FIRST IS ONGOING WITH A PACIFIC COLD FRONT BRINGING  
WIDESPREAD RAIN AND MOUNTAIN SNOW FROM CENTRAL CALIFORNIA TO THE  
NORTHERN ROCKIES. THERE WILL NOT BE MUCH OF A BREAK BEFORE THE  
SECOND STORM SYSTEM ARRIVES BY MONDAY EVENING AND LASTING INTO  
TUESDAY. THIS WILL ALSO HAVE A STRONG ONSHORE FLOW ASSOCIATED  
WITH IT, AND GIVEN THE STRONG PRESSURE GRADIENT, STRONG AND GUSTY  
WINDS ARE LIKELY FOR COASTAL AREAS AND EXPOSED TERRAIN. SNOWFALL  
COULD EASILY EXCEED A FOOT FOR THE WASHINGTON CASCADES AND THE  
IDAHO MOUNTAINS WITH THIS SECOND EVENT.  
 
ELSEWHERE ACROSS THE CONTINENTAL U.S., MAINLY DRY CONDITIONS ARE  
EXPECTED FROM THE ROCKIES TO FLORIDA AS AN EXPANSIVE HIGH PRESSURE  
RIDGE GOVERNS THE WEATHER PATTERN FOR THE FIRST HALF OF THE WEEK.  
OVERALL, TEMPERATURES ARE EXPECTED TO BE NEAR TO ABOVE AVERAGE FOR  
THE MAJORITY OF THE CONTINENTAL U.S. THROUGH TUESDAY, WITH THE  
EXCEPTION OF THE NORTHEAST U.S. ON TUESDAY WHERE A BRIEF SURGE OF  
COLDER WEATHER WILL PRODUCE READINGS BELOW NORMAL.  
 
D. HAMRICK  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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