215  
FXUS01 KWBC 021702  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
1202 PM EST SUN DEC 02 2018  
 
VALID 00Z MON DEC 03 2018 - 00Z WED DEC 05 2018  
 
...WINTER STORM ACROSS THE PLAINS AND MIDWEST WILL CONTINUE TO  
TAPER DOWN...  
 
...SEVERE WEATHER AND CONCERNS FOR FLASH FLOODING WILL PERSIST  
OVER PORTIONS OF THE SOUTHEAST...  
 
A SURFACE LOW PRESSURE SYSTEM WILL CONTINUE TO TRACK NORTHEASTWARD  
OVER THE NEXT COUPLE OF DAYS, MOVING ACROSS THE GREAT LAKES REGION  
AND INTO ONTARIO AND QUEBEC. SNOW IS FORECAST TO CONTINUE ON THE  
NORTH AND WEST SIDES OF THE LOW, BUT THE SNOW IS EXPECTED TO TAPER  
DOWN ACROSS THE PLAINS AND MIDWEST AS THE LOW PULLS AWAY. A COLD  
FRONT IS FORECAST TO FORM ACROSS THE GREAT LAKES REGION AND DOWN  
ACROSS THE OHIO AND MIDDLE MISSISSIPPI VALLEYS, WHICH WILL LEAD TO  
CONTINUED CHANCES FOR LIGHT SNOW HERE THROUGH TONIGHT. FARTHER  
EAST, A SERIES OF COLD FRONTS WILL ADVANCE TOWARD THE EAST COAST  
TONIGHT AND ON MONDAY, AND IN THE WAKE OF THESE FRONTS WILL BE A  
RESURGENCE OF MUCH COLDER AIR AND BELOW NORMAL TEMPERATURES. THERE  
WILL BE THE DEVELOPMENT OF SOME LAKE-EFFECT SNOWFALL DOWNWIND OF  
THE GREAT LAKES WHERE SEVERAL INCHES OF NEW SNOW IS EXPECTED  
MONDAY THROUGH TUESDAY. ACROSS AREAS OF FAR NORTHERN NEW ENGLAND  
CLOSER TO THE LOW TRACK OF THE LARGER SCALE SYNOPTIC SYSTEM, SOME  
LIGHT ICING DUE TO FREEZING RAIN CAN BE EXPECTED ON MONDAY, BEFORE  
GRADUALLY THE COLD AIR ARRIVES AND CHANGES THIS OVER TO SNOW.  
 
FARTHER SOUTH, SHOWERS AND THUNDERSTORMS ARE FORECAST ALONG AND  
AHEAD OF THE LEADING COLD FRONT SETTLING DOWN ACROSS THE  
SOUTHEAST. THE STORM PREDICTION CENTER HAS A SLIGHT RISK OF SEVERE  
WEATHER IN PLACE FOR PORTIONS OF THE COASTAL PLAIN INCLUDING  
SOUTHERN SOUTH CAROLINA, SOUTHERN GEORGIA AND THE FLORIDA  
PANHANDLE. IN ADDITION TO THE SEVERE WEATHER CONCERNS, HEAVY  
RAINFALL WILL CONTINUE TO BE A PROBLEM FOR ESPECIALLY AREAS OF  
SOUTHERN GEORGIA AND THE FLORIDA PANHANDLE WHERE ALREADY VERY  
HEAVY RAIN HAS OCCURRED OVER THE LAST 24 HOURS. ADDITIONAL  
RAINFALL AMOUNTS OF AS MUCH AS 1 TO 3 INCHES WILL BE POSSIBLE THIS  
EVENING, AND THUS THE THREAT OF FLASH FLOODING WILL CONTINUE. THE  
WEATHER PREDICTION CENTER HAS HIGHLIGHTED A SLIGHT RISK OF  
EXCESSIVE RAINFALL FOR THESE AREAS.  
 
A LOW PRESSURE SYSTEM EXITING THE SOUTHERN ROCKIES WILL WEAKEN AS  
IT ADVANCES OUT ACROSS THE SOUTHERN PLAINS TONIGHT. THIS WILL  
ALLOW THE SNOWFALL OVER THE CENTRAL AND SOUTHERN ROCKIES TO TAPER  
DOWN AS DRIER AIR MOVES IN. A FEW INCHES OF ADDITIONAL SNOW WILL  
BE POSSIBLE TONIGHT BEFORE IT ENDS. ANOTHER LOW PRESSURE SYSTEM IS  
EXPECTED TO APPROACH THE WEST COAST BY TUESDAY, AND THIS WILL  
GRADUALLY INCREASE THE THREAT FOR SOME SHOWERS ACROSS THE  
CALIFORNIA COASTAL RANGES AND SOME SNOW FOR THE HIGH TERRAIN OF  
THE SIERRA-NEVADA.  
 
TEMPERATURE-WISE, THE EASTERN SEABOARD WILL BE MILD AT LEAST FOR  
MONDAY WITH HIGH TEMPERATURES 10 TO 15 DEGREES ABOVE NORMAL,  
HOWEVER THIS WILL CHANGE ON TUESDAY AS MUCH COLDER AIR OVER THE  
PLAINS AND MIDWEST SHIFTS ACROSS THE EASTERN U.S. A LARGE AREA OF  
THE WESTERN U.S. AND ESPECIALLY OVER THE GREAT BASIN AND ROCKIES  
WILL SEE COLD WEATHER PERSIST AS HIGH PRESSURE BUILDS OVER THE  
REGION. HIGH TEMPERATURES HERE WILL BE AS MUCH AS 10 TO 20 DEGREES  
BELOW NORMAL.  
 
ORRISON  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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