977  
FXUS01 KWBC 220748  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
246 AM EST WED NOV 22 2017  
 
VALID 12Z WED NOV 22 2017 - 12Z FRI NOV 24 2017  
 
...MORE HEAVY RAIN EXPECTED FOR THE NORTHWEST AND ANOTHER COLD  
FRONT WILL SWEEP THROUGH THE CENTRAL AND EASTERN STATES...  
 
THE WEST COAST NORTH OF SAN FRANCISCO WILL REMAIN ACTIVE  
WEATHERWISE THROUGH THANKSGIVING WITH PERSISTENT ONSHORE FLOW AND  
DEEP MOISTURE MOVING INLAND. THE RESULT OF THIS ATMOSPHERIC RIVER  
WILL BE A HEAVY RAINFALL EVENT ALONG AND WEST OF THE CASCADES,  
WITH THE POTENTIAL FOR AMOUNTS IN EXCESS OF THREE INCHES POSSIBLE,  
PARTICULARLY FOR WESTERN WASHINGTON. MODERATE TO HEAVY RAIN CAN  
ALSO BE EXPECTED FOR PARTS OF THE NORTHERN ROCKIES AS THE MOISTURE  
MOVES FARTHER INLAND. GIVEN THE WARM NATURE OF THIS WEATHER  
PATTERN, SNOW WILL BE CONFINED ONLY THE HIGHEST MOUNTAIN  
LOCATIONS, MAINLY ABOVE TREELINE. SOME INSTANCES OF FLOODING WILL  
ALSO BE POSSIBLE ACROSS PARTS OF THE PACIFIC NORTHWEST.  
 
EAST OF THE ROCKIES, A COLD FRONT WILL EXIT THE EAST COAST ON  
WEDNESDAY AND BRING A RETURN TO COOLER WEATHER FOR MUCH OF THE  
EASTERN U.S. SHOWERS AND A FEW THUNDERSTORMS WILL BE POSSIBLE  
ACROSS FLORIDA AND THE SOUTHEAST U.S. COAST OVER THE NEXT COUPLE  
OF DAYS OWING TO THIS COLD FRONT THAT IS FORECAST TO STALL NEAR  
THIS AREA. WARM AND DRY CONDITIONS WILL CONTINUE FOR THE DESERT  
SOUTHWEST WITH HIGHS NEAR 90 DEGREES FOR THE LOWER ELEVATIONS AS  
AN UPPER LEVEL RIDGE GOVERNS THE WEATHER PATTERN.  
 
D. HAMRICK  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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