047  
FXUS01 KWBC 201844  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
143 PM EST THU DEC 20 2018  
 
VALID 00Z FRI DEC 21 2018 - 00Z SUN DEC 23 2018  
 
...SEVERE STORMS POSSIBLE ACROSS SOUTHERN FLORIDA THIS EVENING  
WITH A HEAVY RAINFALL AND FLOODING THREAT EXTENDING FROM THE  
SOUTHEAST INTO THE MID-ATLANTIC AND THE NORTHEAST...  
   
..RECORD MILD TEMPERATURES INTO THE NORTHEAST ON FRIDAY
 
 
   
..ANOTHER SYSTEM WILL BRING MORE RAIN AND SNOW TO THE NORTHWEST
 
 
A SIGNIFICANT STORM SYSTEM CURRENTLY LOCATED IN THE SOUTHEAST  
U.S., WILL PUSH QUICKLY NORTH AND EASTWARD SPREADING HEAVY  
RAINFALL ACROSS MUCH OF THE EASTERN U.S. THROUGH FRIDAY. GIVEN  
SIGNIFICANT MOISTURE ASSOCIATED WITH THIS SYSTEM, FLOODING AND  
FLASH FLOODING WILL BE A THREAT ALONG AND AHEAD OF THE COLD FRONT  
-- WPC HAS A SLIGHT RISK HIGHLIGHTED ON THE EXCESSIVE RAINFALL  
GRAPHIC ACROSS THE FLORIDA/SOUTHEAST AND FROM THE  
MID-ATLANTIC/CENTRAL APPALACHIANS TO COASTAL NEW ENGLAND. FLOOD  
WATCHES ARE IN EFFECT FROM THE CENTRAL MID-ATLANTIC TO PARTS OF  
THE NORTHEAST. IN ADDITION TO HEAVY RAINFALL, SEVERE WEATHER  
CAPABLE OF PRODUCING TORNADOES IS POSSIBLE ACROSS PARTS OF  
SOUTHERN FLORIDA THIS EVENING. AHEAD OF THE SYSTEM, TEMPERATURES  
WILL BE WELL ABOVE NORMAL ACROSS MUCH OF THE NORTHEAST INTO  
FRIDAY, WITH RECORD HIGHS POSSIBLE IN THE PHILADELPHIA TO BOSTON  
CORRIDOR. BEHIND THE FRONT, COOLER AIR FILTER IN ALLOWING FOR  
ACCUMULATING SNOWFALL ACROSS THE LOWER GREAT LAKES AND WESTERN  
SLOPES OF THE APPALACHIANS FRIDAY INTO SATURDAY.  
 
YET ANOTHER SYSTEM MOVING INTO THE NORTHWEST WILL CONTINUE TO  
BRING HEAVY RAIN AND MOUNTAIN SNOWS FROM COASTAL WASHINGTON/OREGON  
AND INTO NORTHERN CALIFORNIA TONIGHT. CONDITIONS DRY OUT A BIT IN  
THE PACIFIC NORTHWEST ON FRIDAY IN BETWEEN SYSTEMS, BUT LOWER  
ELEVATION RAINS AND HEAVY MOUNTAIN SNOWS SHOULD MOVE THROUGH PARTS  
OF THE INTERMOUNTAIN WEST AND ROCKIES. AHEAD OF THE SYSTEM,  
TEMPERATURES FROM THE FRONT RANGE INTO THE PLAINS WILL BE WELL  
ABOVE NORMAL INTO THE WEEKEND. ACROSS THE REST OF THE NORTHWEST,  
TEMPERATURES WILL BE NEAR TO BELOW NORMAL BEFORE ANOTHER ROUND OF  
HEAVY RAINFALL AND HIGH ELEVATION SNOWS MOVE INTO THE PACIFIC  
NORTHWEST BY SATURDAY AFTERNOON AND EVENING.  
 
SANTORELLI  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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