245  
FXUS01 KWBC 071926  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
226 PM EST MON JAN 07 2019  
 
VALID 00Z TUE JAN 08 2019 - 00Z THU JAN 10 2019  
 
...WINTRY PRECIPITATION EXPECTED THE NEXT SEVERAL DAYS FROM THE  
GREAT LAKES TO THE NORTHEAST...  
 
...COLDER AIR WILL ARRIVE OVER THE NORTHERN PLAINS AND GREAT LAKES  
TUESDAY, BRINGING AN END TO THE MUCH ABOVE AVERAGE TEMPERATURES...  
 
...THE NEXT ROUND OF HEAVY PRECIPITATION EXPECTED TO IMPACT THE  
WEST COAST BY TUESDAY...  
 
SEVERAL LOWS WILL MOVE FROM THE GREAT LAKES INTO THE NORTHEAST  
OVER THE NEXT FEW DAYS, DELIVERING PRECIPITATION REGION-WIDE. THE  
FIRST LOW WILL MOVE FROM WISCONSIN INTO WESTERN QUEBEC OVERNIGHT,  
SPREADING PRECIPITATION EASTWARD INTO THE NORTHEAST. A SECONDARY  
LOW WILL ARRIVE IN THE GREAT LAKES TUESDAY MORNING, QUICKLY MOVE  
EAST, AND THEN STRENGTHEN ALONG THE NORTHEAST COAST TUESDAY NIGHT  
AND WEDNESDAY. THE PASSAGE OF THE TWO LOWS SHOULD CAUSE  
TEMPERATURES TO FLUCTUATE FROM THE GREAT LAKES INTO THE NORTHEAST,  
WHICH MAY CAUSE MULTIPLE CHANGES IN PRECIPITATION TYPES IN SOME  
AREAS. MUCH COLDER AIR SHOULD ARRIVE BEHIND THE SECOND LOW ON  
TUESDAY NIGHT AND WEDNESDAY, LEADING TO A FINAL CHANGEOVER TO SNOW  
ACROSS MUCH OF THE INTERIOR NORTHEAST AND LAKE EFFECT SNOW IN THE  
GREAT LAKES. SIGNIFICANT SNOW ACCUMULATION IS EXPECTED FROM  
UPSTATE NEW YORK INTO VERMONT, NEW HAMPSHIRE AND INLAND MAINE,  
WITH OVER 8 INCHES OF SNOW LIKELY.  
 
TEMPERATURES TONIGHT WILL BE 20 TO 30 DEGREES ABOVE NORMAL FROM  
THE NORTHERN PLAINS INTO THE GREAT LAKES AND OHIO VALLEY. HOWEVER,  
COLDER AIR WILL BEGIN TO ARRIVE TUESDAY WITH THE SECOND LOW  
PRESSURE SYSTEM, AND BY WEDNESDAY MORNING SUB-ZERO WIND CHILLS ARE  
LIKELY FROM THE DAKOTAS INTO MINNESOTA AND WISCONSIN. TEMPERATURES  
WILL ALSO BEGIN TO COOL ACROSS THE REST OF THE MIDWEST, OHIO  
VALLEY AND NORTHEAST FROM TUESDAY NIGHT INTO WEDNESDAY.  
 
ON THE WEST COAST, THE NEXT ROUND OF PRECIPITATION IS LIKELY TO  
ARRIVE EARLY TUESDAY AS A DEEP LOW PRESSURE SYSTEM MOVES SLOWLY  
ACROSS THE NORTHEAST PACIFIC. LOCALLY HEAVY RAINFALL IS POSSIBLE  
IN THE LOWER ELEVATIONS OF NORTHERN CALIFORNIA AND THE PACIFIC  
NORTHWEST, WITH ACCUMULATING SNOW AT THE HIGHEST ELEVATIONS OF THE  
CASCADES AND SIERRA NEVADA RANGES. THIS IS EXPECTED TO BE A WARM  
SYSTEM OVERALL, AND SNOW LEVELS WILL INCREASE SUBSTANTIALLY  
OVERNIGHT INTO TUESDAY -- LIKELY ABOVE 6000 FEET EVERYWHERE EXCEPT  
THE WASHINGTON CASCADES. SOME FREEZING RAIN WILL ALSO BE POSSIBLE  
IN THE COLUMBIA BASIN OF WASHINGTON AND OREGON.  
 
LAMERS  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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