626  
FXUS01 KWBC 082000  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
300 PM EST FRI DEC 08 2017  
 
VALID 00Z SAT DEC 09 2017 - 00Z MON DEC 11 2017  
 
...ACCUMULATING SNOWFALL LIKELY FROM THE INTERIOR SOUTHEAST TO THE  
MID-ATLANTIC STATES AND THE NORTHEAST...  
 
...LOCALLY HEAVY LAKE EFFECT SNOWFALL TO CONTINUE DOWNWIND OF THE  
GREAT LAKES...  
 
...CRITICAL TO EXTREME FIRE WEATHER CONDITIONS EXPECTED TO PERSIST  
ACROSS PORTIONS OF SOUTHERN CALIFORNIA...  
 
A FRONTAL BOUNDARY STRETCHING FROM THE WESTERN ATLANTIC, ACROSS  
CENTRAL FLORIDA AND THE NORTHERN GULF OF MEXICO WAS RESULTING IN A  
LARGE SWATH OF PRECIPITATION FROM THE CENTRAL GULF COAST TO THE  
SOUTHERN MID-ATLANTIC. WHILE MOST OF THIS WAS FALLING AS A COLD  
RAIN, BELOW-AVERAGE COLD AIR FILTERING INTO THE REGION WAS  
ALLOWING A CHANGEOVER TO SNOW ON THE NORTHERN EDGE OF THE  
PRECIPITATION SHIELD WITH RARE ACCUMULATING SNOWFALL OCCURRING  
ACROSS PORTIONS OF THE DEEP SOUTH TO THE INTERIOR SOUTHEAST. THIS  
SNOWFALL IS EXPECTED TO CONTINUE OVERNIGHT WHILE AT THE SAME TIME  
A DEVELOPING AREA OF LOW PRESSURE IN THE GULF OF MEXICO MOVES INTO  
THE WESTERN ATLANTIC AND STRENGTHENS AS IT MOVES NORTHWARD OFF THE  
EAST COAST THIS WEEKEND. THIS WILL HELP SPREAD THE ACCUMULATING  
SNOW INTO THE MID-ATLANTIC AND THE NORTHEAST THIS WEEKEND WITH 3  
TO 6 INCHES FORECAST FOR CENTRAL VIRGINIA AND UP THE MID-ATLANTIC  
AND NORTHEAST COASTS. ACROSS CENTRAL AND SOUTHERN FLORIDA, HEAVY  
RAINFALL AND STRONG TO SEVERE THUNDERSTORMS WILL CONTINUE TONIGHT  
AND INTO SATURDAY AS THE FRONTAL BOUNDARY MOVES ACROSS THE STATE.  
 
A SERIES OF UPPER LEVEL DISTURBANCES WITH REINFORCING SHOTS OF  
COLD AIR FLOWING OVER THE STILL RELATIVELY WARM LAKES WILL  
CONTINUE TO ALLOW FOR MODERATE TO LOCALLY HEAVY SNOWFALL  
IMMEDIATELY DOWNWIND OF THE GREAT LAKES OVER THE NEXT COUPLE OF  
DAYS. THE HEAVIEST SNOWFALL ACCUMULATIONS ARE EXPECTED ACROSS  
PORTIONS OF THE MICHIGAN UPPER PENINSULA, AND ALONG THE EASTERN  
SHORE OF LAKE MICHIGAN, WHERE WINTER WEATHER ADVISORIES ARE POSTED.  
 
OUT WEST, AN AMPLIFIED UPPER-LEVEL RIDGING PATTERN WILL PERSIST  
THROUGH THE WEEKEND RESULTING IN WARM AND DRY WEATHER. GUSTY WINDS  
ACROSS SOUTHERN CALIFORNIA WILL KEEP ELEVATED TO CRITICAL FIRE  
WEATHER CONDITIONS ACROSS SOUTHERN CALIFORNIA WHERE DANGEROUS  
WILDFIRES ARE ONGOING AND RED FLAG WARNINGS/HIGH WIND WARNINGS ARE  
IN EFFECT. ELEVATED TO CRITICAL FIRE WEATHER CONCERNS ARE ALSO IN  
EFFECT ACROSS PORTIONS OF THE CENTRAL HIGH PLAINS TONIGHT DUE TO  
GUSTY WINDS AND LOW RELATIVE HUMIDITIES. PLEASE MONITOR THE  
PRODUCTS ISSUED BY THE LOCAL WEATHER FORECAST OFFICES ACROSS THESE  
AREAS FOR ADDITIONAL INFORMATION.  
 
SANTORELLI  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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