322  
FXUS01 KWBC 040804  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
303 AM EST THU JAN 04 2018  
 
VALID 12Z THU JAN 04 2018 - 12Z SAT JAN 06 2018  
 
...HEAVY SNOW POSSIBLE AND POSSIBLE BLIZZARD CONDITION OVER PARTS  
OF THE MID-ATLANTIC COAST INTO NEW ENGLAND...  
 
...HEAVY RAIN POSSIBLE OVER THE PACIFIC NORTHWEST AND NORTHERN  
CALIFORNIA COAST...  
   
..HEAVY SNOW DOWNWIND FROM THE GREAT LAKES
 
 
...RAIN/FREEZING RAIN POSSIBLE OVER PARTS OF THE INTERIOR  
NORTHWEST INTO NORTHERN INTERMOUNTAIN REGION...  
 
A STRONG STORM NEAR THE MID-ATLANTIC COAST WILL TRAVEL  
NORTHEASTWARD INTO SOUTHEASTERN CANADA BY FRIDAY MORNING. THE  
STORM WILL PRODUCE HEAVY SNOW ALONG THE MID-ATLANTIC COAST INTO  
SOUTHERN NEW ENGLAND BY THURSDAY MORNING THAT WILL MOVE NORTHWARD  
INTO THE NORTHEAST BY THURSDAY AFTERNOON, WHILE ENDING OVER THE  
MID-ATLANTIC COAST BY THURSDAY EVENING. THE HEAVY SNOW WILL  
CONTINUE OVER THE NORTHEAST OVERNIGHT THURSDAY BEGINNING TO WANE  
ON FRIDAY MORNING. THE SNOW WILL TAPER OFF TO LIGHT SNOW OVER  
PARTS OF NORTHERN NEW ENGLAND BY FRIDAY EVENING.  
 
MEANWHILE, IN THE WAKE OF THE STORM, AN AREA OF COLD HIGH PRESSURE  
WILL MOVE SOUTHWARD OUT OF CENTRAL CANADA INTO THE UPPER  
MISSISSIPPI VALLEY ON THURSDAY INTO FRIDAY. THE COLD AIR AND  
UPPER-LEVEL ENERGY WILL MOVE OVER THE LAKES PRODUCING LAKE EFFECT  
SNOW DOWNWIND FROM THE GREAT LAKES THROUGH SATURDAY. THE SNOW MAY  
BE HEAVY AT TIMES. IN ADDITION, UPPER-LEVEL JET DYNAMICS WILL AID  
IN PRODUCING A STREAK OF LIGHT SNOW OVER PARTS OF THE NORTHERN  
PLAINS/UPPER MISSISSIPPI VALLEY, ON THURSDAY, THAT WILL MOVE TO  
PARTS OF THE WESTERN OHIO VALLEY BEFORE DISSIPATING ON FRIDAY  
MORNING.  
 
IN THE MEANTIME, WEAKENING UPPER-LEVEL ENERGY FOLLOWED BY A FRONT  
WILL MOVE INTO THE PACIFIC NORTHWEST THURSDAY INTO SATURDAY.  
MOISTURE WILL ALSO MOVE INTO THE WEST COAST THROUGH SATURDAY, TOO.  
RAIN WILL DEVELOP OVER PARTS OF THE PACIFIC NORTHWEST COAST INTO  
NORTHERN/CENTRAL CALIFORNIA ON THURSDAY THAT WILL EXPAND INTO  
INTERIOR PARTS OF THE NORTHWEST ON THURSDAY EVENING INTO FRIDAY  
EVENING. SOME OF THE INTERIOR VALLEYS OF THE NORTHWEST/NORTHERN  
INTERMOUNTAIN REGION WILL DEVELOP AREAS OF RAIN/FREEZING RAIN ON  
THURSDAY EVENING INTO FRIDAY EVENING AS WELL.  
 
KEY MESSAGES: EAST COAST WINTER STORM  
 
1. SNOWFALL WILL INCREASE NORTHWARD INTO PORTIONS OF THE  
MID-ATLANTIC AND NEW ENGLAND THROUGH THURSDAY. BLIZZARD CONDITIONS  
ARE POSSIBLE CLOSE TO THE COAST IN PORTIONS OF THE MID-ATLANTIC  
AND NORTHEAST.  
 
2. CONFIDENCE IN HEAVY SNOWFALL HAS INCREASED FOR PARTS OF THE  
NORTHEAST AS THE SURFACE LOW IS EXPECTED TO TRACK CLOSER TO THE  
COAST AND INTENSIFY RAPIDLY.  
 
3. THIS SYSTEM HAS THE POTENTIAL TO PRODUCE STRONG, DAMAGING  
WINDS, POSSIBLY RESULTING IN DOWNED TREES AND/OR POWER OUTAGES.  
 
4. MINOR TO MAJOR COASTAL FLOODING/EROSION IS POSSIBLE DUE TO A  
COMBINATION OF HIGH TIDES AND WAVE ACTION, ESPECIALLY THIS  
AFTERNOON.  
 
5. WARNINGS ARE IN EFFECT FROM THE MID-ATLANTIC NORTHWARD THROUGH  
NEW ENGLAND, WHICH MEANS HAZARDOUS CONDITIONS ARE IMMINENT.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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