588  
FXUS01 KWBC 120759  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
259 AM EST TUE DEC 12 2017  
 
VALID 12Z TUE DEC 12 2017 - 12Z THU DEC 14 2017  
 
...IMPROVING BUT STILL ELEVATED FIRE WEATHER CONDITIONS FOR  
SOUTHERN CALIFORNIA...  
 
...COASTAL STORM TO BRING WINTRY CONDITIONS TO PORTIONS OF THE  
NORTHEAST TODAY AND TONIGHT...  
 
...LOCALLY HEAVY LAKE EFFECT SNOWFALL TO CONTINUE DOWNWIND OF THE  
GREAT LAKES...  
 
STRONG HIGH PRESSURE OVER THE WEST IS EXPECTED TO GRADUALLY WEAKEN  
INTO MID-WEEK WHICH SHOULD LESSEN THE WILDFIRE THREAT ACROSS  
SOUTHERN CALIFORNIA BUT KEEP WARM TEMPERATURES IN PLACE. GUSTY  
WINDS AND LOW RELATIVE HUMIDITIES WILL CONTINUE TO POSE ELEVATED  
FIRE WEATHER CONDITIONS TODAY, WITH A DIMINISHED BUT NON-ZERO  
THREAT FOR WEDNESDAY.  
 
LOW PRESSURE WILL ORGANIZE AND STRENGTHEN OVER THE LOWER GREAT  
LAKES TODAY, DRAGGING A COLD FRONT ACROSS THE EAST COAST. MUCH  
COLDER TEMPERATURES WILL FILTER IN BEHIND A STRONG COLD FRONT FOR  
THE EAST COAST TONIGHT INTO WEDNESDAY WITH EXPECTED HIGH  
TEMPERATURES ON WEDNESDAY 10 TO 20 DEGREES BELOW AVERAGE FROM  
FLORIDA TO THE GREAT LAKES. MEANWHILE, AS THE LOW PRESSURE CENTER  
CONTINUES TO WRAP UP TONIGHT INTO WEDNESDAY MORNING OVER NEW  
ENGLAND, MODERATE SNOWFALL IS EXPECTED FOR PORTIONS OF UPSTATE NEW  
YORK INTO INTERIOR PORTIONS OF NEW ENGLAND WITH A WINTRY MIX  
POSSIBLE FROM CENTRAL MASSACHUSETTS TO THE COAST OF MAINE. WINTER  
STORM WARNINGS AND WINTER WEATHER ADVISORIES ARE IN EFFECT FOR  
THESE LOCATIONS THROUGH WEDNESDAY MORNING GIVEN THE ANTICIPATED  
DETERIORATING CONDITIONS.  
 
COLD AIR BLOWING ACROSS THE RELATIVELY WARM GREAT LAKES WILL  
CONTINUE TO PRODUCE LAKE EFFECT SNOW SHOWERS WITH THE GREATEST  
SNOWFALL ACCUMULATIONS THROUGH THURSDAY ACROSS SOUTHWESTERN LOWER  
MICHIGAN AND EAST OF LAKES ERIE AND ONTARIO WHERE LOCAL TOTALS  
OVER A FOOT WILL BE POSSIBLE.  
 
THE NORTH-CENTRAL U.S. AND UPPER MISSISSIPPI VALLEY WILL SEE A  
SERIES OF WEAK CLIPPER SYSTEMS MOVE THROUGH THE REGION TONIGHT AND  
WEDNESDAY NIGHT. IN ADVANCE OF THE FIRST CLIPPER, DOWNSLOPE WINDS  
WILL GENERATE HIGH TEMPERATURES ACROSS THE CENTRAL AND NORTHERN  
HIGH PLAINS IN THE 50S AND 60S, WELL ABOVE AVERAGE FOR  
MID-DECEMBER. COLDER TEMPERATURES WILL RESIDE FARTHER NORTH AND  
EAST IN THIS PATTERN WITH THE CLIPPER SYSTEMS GENERATING LIGHT  
SNOW OR A WINTRY MIX ACROSS THE EASTERN DAKOTAS INTO MINNESOTA BUT  
WITH ANY ACCUMULATIONS GENERALLY BELOW AN INCH.  
 
OTTO  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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