268  
FXUS01 KWBC 030823  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
323 AM EST WED JAN 03 2018  
 
VALID 12Z WED JAN 03 2018 - 12Z FRI JAN 05 2018  
 
...HEAVY SNOW POSSIBLE FOR THE MID-ATLANTIC COAST NORTHWARD TO NEW  
ENGLAND COAST...  
   
..SNOW/RAIN AND FREEZING RAIN POSSIBLE FOR THE SOUTHEAST COAST
 
 
   
..HEAVY LAKE EFFECT SNOW FOR THE UPPER GREAT LAKES
 
 
A RAPIDLY DEEPENING AREA OF LOW PRESSURE JUST OFF THE EAST COAST  
OF FLORIDA WILL MOVE NORTHEASTWARD TO THE CANADIAN MARITIMES BY  
FRIDAY. THE STORM WILL PRODUCE AREAS OF SNOW AND RAIN/FREEZING  
RAIN ALONG THE SOUTHEAST COAST THROUGH LAST WEDNESDAY EVENING. AS  
THE STORM CONTINUES TO MOVE NORTHEASTWARD, SNOW AND RAIN WILL  
DEVELOP OVER PARTS OF THE SOUTHERN MID-ATLANTIC COAST THAT WILL  
CHANGE OVER TO ALL SNOW BY THURSDAY MORNING. THE SNOW MAY BE  
HEAVY OVER PARTS OF THE SOUTHERN MID-ATLANTIC COAST OVERNIGHT  
WEDNESDAY. IN ADDITION, BY EARLY THURSDAY MORNING, SNOW WILL  
BEGIN TO DEVELOP OVER PARTS OF NEW ENGLAND AND EXPAND INTO  
NORTHERN NEW ENGLAND BY THURSDAY AFTERNOON CONTINUING INTO FRIDAY  
MORNING. THE SNOW MAY VE HEAVY AT TIMES OVER NEW ENGLAND. THE  
SNOW WILL END OVER THE MID-ATLANTIC BY THURSDAY EVENING.  
ADDITIONALLY, SOME AREAS OF RAIN AND THUNDERSTORMS WILL DEVELOP  
OVER PARTS OF SOUTHEAST FLORIDA ON WEDNESDAY INTO WEDNESDAY  
EVENING.  
 
MEANWHILE, A FRONT OVER THE GREAT LAKES TO THE MIDDLE MISSISSIPPI  
VALLEY THEN EXTENDING NORTHWESTWARD INTO THE NORTHERN HIGH PLAINS  
AND MOVE INTO THE LOWER GREAT LAKES/OHIO VALLEY TO THE LOWER  
MISSISSIPPI VALLEY BY WEDNESDAY EVENING. THE ASSOCIATED AREA OF  
LOW PRESSURE WILL BE ABSORBED INTO THE GREATER CIRCULATION AROUND  
THE RAPIDLY DEEPENING COASTAL STORM OVER THE NORTHEAST BY THURSDAY  
MORNING AS THE ASSOCIATED FRONT DISSIPATES, TOO. THE SYSTEM WILL  
PRODUCE SNOW OVER THE GREAT LAKES ON WEDNESDAY MOVING INTO THE  
LOWER GREAT LAKES BY OVERNIGHT WEDNESDAY. IN THE WAKE OF THE  
STORM LAKE EFFECT SNOW WILL DEVELOP DOWNWIND FROM THE UPPER GREAT  
LAKES OVERNIGHT WEDNESDAY INTO FRIDAY. THE LAKE EFFECT SNOW WILL  
BE HEAVY AT TIMES DURING THIS TIME PERIOD.  
 
ELSEWHERE, A WEAKENING UPPER-LEVEL LOW OFF THE CALIFORNIA COAST  
OVER THE PACIFIC WILL MOVE NORTHEASTWARD INTO THE PACIFIC  
NORTHWEST BY THURSDAY MORNING INTO FRIDAY. THE ENERGY WILL ALSO  
BRING MOISTURE INTO THE WEST COAST ON WEDNESDAY INTO FRIDAY. RAIN  
WILL BEGIN TO DEVELOP OVER PARTS OF THE CALIFORNIA COAST BY  
WEDNESDAY EVENING. THE RAIN WILL EXPAND NORTHEASTWARD INTO THE  
PACIFIC NORTHWEST OVERNIGHT WEDNESDAY CONTINUING INTO FRIDAY. THE  
RAIN WILL END OVER SOUTHERN/CENTRAL CALIFORNIA BY THURSDAY  
MORNING.  
 
KEY MESSAGES: EAST COAST WINTER STORM  
 
1. THIS WINTER STORM IS FORECAST TO BRING THE POTENTIAL FOR A MIX  
OF FREEZING RAIN/SLEET/SNOW FROM PORTIONS OF NORTHERN FLORIDA TO  
NORTH CAROLINA, AND SNOWFALL NORTHWARD ALONG PORTIONS OF THE  
MID-ATLANTIC INTO NORTHERN NEW ENGLAND. BLIZZARD CONDITIONS ARE  
POSSIBLE ACROSS PORTIONS OF EASTERN NEW ENGLAND LATE THURSDAY.  
 
2. IF THIS WINTER STORM TRACKS CLOSER TO THE COAST, IT COULD MEAN  
MORE SNOW WHILE A TRACK FARTHER EAST COULD MEAN LESS SNOW.  
 
3. THIS SYSTEM HAS THE POTENTIAL TO PRODUCE STRONG, DAMAGING WINDS  
POSSIBLY RESULTING IN DOWNED TREES AND/OR POWER OUTAGES.  
 
4. MINOR TO MODERATE COASTAL FLOODING/EROSION IS POSSIBLE DUE TO A  
COMBINATION OF HIGH TIDES AND WAVE ACTION, ESPECIALLY THURSDAY  
AFTERNOON, JANUARY 4.  
 
5. WINTER STORM WATCHES AND WARNINGS ARE IN EFFECT FROM NORTH  
CENTRAL FLORIDA NORTHWARD THROUGH EASTERN NEW ENGLAND.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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