767  
FXUS01 KWBC 122001  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
300 PM EST TUE DEC 12 2017  
 
VALID 00Z WED DEC 13 2017 - 00Z FRI DEC 15 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...  
 
THE WARM AND DRY CONDITIONS ACROSS THE WEST WILL PERSIST THROUGH  
MIDWEEK, HOWEVER THE THREAT FOR CRITICAL FIRE WEATHER WILL LESSEN  
AS THE UPPER RIDGE BEGINS TO WEAKEN. LIGHT PRECIPITATION WILL BE  
POSSIBLE ALONG AND EAST OF THE NORTHERN/CENTRAL ROCKIES AS A  
SERIES OF CLIPPER SYSTEMS DIVE SOUTHEAST FROM CANADA. 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.  
RAIN WILL MOVE INTO THE COASTAL AREAS OF THE PACIFIC NORTHWEST BY  
THURSDAY AFTERNOON AS A COLD FRONT OVER THE PACIFIC OCEAN  
APPROACHES THE COAST.  
 
WIDESPREAD RAIN AND SNOW IS MOVING ACROSS THE NORTHEAST TODAY IN  
ASSOCIATIONS WITH A PASSING COLD FRONT. MUCH COLDER AIR WILL SPILL  
INTO THE EAST COAST; WHICH WILL RESULT IN MAXIMUM TEMPERATURES  
RANGING 10 TO 20 DEGREES BELOW AVERAGE FROM FLORIDA TO THE GREAT  
LAKES ON WEDNESDAY. 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.  
 
ADDITIONALLY, PRIME CONDITIONS FOR LAKE ENHANCED SNOWFALL WILL  
CONTINUE THROUGH THURSDAY (COLD AIR BLOWING ACROSS THE RELATIVELY  
WARM GREAT LAKES). THE GREATEST ACCUMULATIONS ACROSS SOUTHWESTERN  
LOWER MICHIGAN AND EAST OF LAKES ERIE AND ONTARIO WHERE LOCAL  
TOTALS OVER A FOOT WILL BE POSSIBLE. LAKE EFFECT SNOW WARNINGS ARE  
IN EFFECT FOR NORTHEAST OHIO,NORTHWEST PENNSYLVANIA AND SOUTHWEST  
NEW YORK.  
 
CAMPBELL/OTTO  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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