310  
FXUS01 KWBC 200735  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
234 AM EST THU DEC 20 2018  
 
VALID 12Z THU DEC 20 2018 - 12Z SAT DEC 22 2018  
 
...SEVERE STORMS POSSIBLE ACROSS FLORIDA TODAY WITH LOCALLY HEAVY  
RAIN AND POSSIBLE FLOODING IN THE SOUTHEAST/MID-ATLANTIC...  
   
..RECORD MILD TEMPERATURES INTO THE NORTHEAST FRIDAY
 
 
...ANOTHER SYSTEM WILL BRING MORE RAIN AND SNOW TO THE NORTHWEST  
TODAY...  
 
AN ORGANIZING SYSTEM ALONG THE CENTRAL GULF COAST WILL CONTINUE TO  
DEEPEN TODAY AS ITS ATTENDANT COLD FRONT MOVES INTO THE FLORIDA  
PENINSULA. WITH STRONG SOUTHERLY WINDS AHEAD OF THE FRONT AND A  
MOISTURE PLUME EMANATING FROM NEAR CENTRAL AMERICA, WIDESPREAD  
RAINFALL (1-2") AND EMBEDDED THUNDERSTORMS (SOME SEVERE) ARE  
LIKELY FROM THE SOUTHEAST INTO THE MID-ATLANTIC TODAY. FLOOD  
WATCHES ARE IN EFFECT FOR MUCH OF THE EAST -- TURN AROUND, DON'T  
DROWN. IN ADDITION, A WARM FRONT WILL SURGE NORTHWESTWARD TOWARD  
THE APPALACHIANS WITH MUCH MILDER AIR PRECEDING THE COLD FRONT  
WHICH WILL KEEP TEMPERATURES QUITE MILD OVERNIGHT TONIGHT. ON  
FRIDAY, THE MAIN SURFACE LOW WILL CONTINUE TO LIFT NORTHWARD  
TOWARD LAKE ONTARIO WITH AN ANOMALOUSLY STRONG SOUTHERLY PUSH OF  
MILD AIR INTO NEW ENGLAND. FLOODING MAY BE POSSIBLE GIVEN RATHER  
WET ANTECEDENT CONDITIONS AND AN AIRMASS MORE TYPICAL OF MID-FALL  
RATHER THAN EARLY WINTER. THOUGH SOME WINTRY PRECIPITATION IS  
LIKELY AHEAD OF THE WARM FRONT, ALL OF THE NORTHEAST WILL SEE  
TEMPERATURES RISE ABOVE FREEZING ON FRIDAY. AROUND THIS DYNAMIC  
SYSTEM WILL BE A SECONDARY COLD FRONT THAT WILL USHER IN COOLER  
TEMPERATURES TO THE SOUTHEAST ON FRIDAY. ANOTHER COLD FRONT  
DROPPING THROUGH THE GREAT LAKES WILL BRING BACK MORE TYPICAL  
COLDER TEMPERATURES TO THE EASTERN GREAT LAKES LATE FRIDAY INTO  
SATURDAY WITH SOME SNOW SHOWERS INTO THE WEST SLOPES OF THE  
APPALACHIANS.  
 
ANOTHER SURFACE LOW MOVING THROUGH THE NORTHEASTERN PACIFIC WILL  
CONTINUE TO BRING SOME RAIN/SNOW TO THE REGION ALONG ITS WARM  
FRONT, BUT THE BRUNT OF THE PRECIPITATION WILL BE INTO BRITISH  
COLUMBIA. NEVERTHELESS, SEVERAL INCHES OF SNOW ARE LIKELY OVER THE  
CASCADES TODAY WITH BREEZY/WINDY CONDITIONS ESPECIALLY ALONG THE  
COAST. THE DEEP LOW WILL GENERATE ROUGH SEAS OFFSHORE WA/OR ABOUT  
20-25FT TODAY AS THE COLD FRONT APPROACHES THEN PUSHES INTO THE  
COAST. TEMPERATURES WILL BE ABOVE NORMAL TODAY OVER MOST OF THE  
WEST BUT COOLER THAN NORMAL TOMORROW IN MUCH OF WESTERN  
WASHINGTON/OREGON BEHIND THE COLD FRONT. FARTHER EAST, THE FRONT  
RANGE WILL SEE TEMPERATURES WELL ABOVE NORMAL TOMORROW INTO THE  
60S BUT PERHAPS A FEW DEGREES SHY OF RECORD HIGHS FOR THE DATE.  
 
FRACASSO  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab HPC Page Main Text Page