190  
FXUS01 KWBC 222027  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
327 PM EST WED NOV 22 2017  
 
VALID 00Z THU NOV 23 2017 - 00Z SAT NOV 25 2017  
   
..HEAVY RAIN POSSIBLE OVER THE PACIFIC NORTHWEST
 
 
   
..HEAVY RAIN POSSIBLE OVER NORTHERN FLORIDA PENINSULA
 
 
A WAVE OF LOW PRESSURE ALONG A FRONT OVER THE EASTERN GULF OF  
MEXICO WILL MOVE NORTHEASTWARD ACROSS THE FLORIDA PENINSULA  
OVERNIGHT THURSDAY (THANKSGIVING) INTO THE WESTERN ATLANTIC WELL  
OFF THE SOUTHERN CAROLINA/GEORGIA COAST BY FRIDAY. MOISTURE WILL  
POOL ALONG THE BOUNDARY AIDING IN THE DEVELOPMENT OF SHOWERS AND  
THUNDERSTORMS OVER THE FLORIDA PENINSULA OVERNIGHT WEDNESDAY INTO  
FRIDAY MORNING. RAIN WILL BE HEAVY AT TIMES.  
 
MEANWHILE, A FRONT JUST OFF THE PACIFIC NORTHWEST COAST WILL MOVE  
INLAND ON THANKSGIVING CONTINUING TO MOVE EASTWARD TO UPPER  
MISSISSIPPI VALLEY/NORTHERN PLAINS WESTWARD INTO THE CENTRAL HIGH  
PLAINS/NORTHERN ROCKIES BY FRIDAY. A PLUME OF MOISTURE ALONG THE  
NORTHWEST COAST WILL MOVE SOUTHWARD TO CENTRAL CALIFORNIA BY  
FRIDAY. RAIN WILL DEVELOP ALONG THE PACIFIC NORTHWEST COAST AND  
PARTS OF THE NORTHERN CALIFORNIA COAST THAT WILL EXTEND INLAND TO  
PARTS OF THE NORTHERN ROCKIES WEDNESDAY EVENING INTO THURSDAY.  
OVERNIGHT WEDNESDAY THE SNOW LEVELS WILL START TO LOWER AS THE  
FRONT MOVES BY. RAIN AND HIGHEST ELEVATION SNOW WILL DEVELOP OVER  
PARTS THE NORTHERN INTERMOUNTAIN REGION INTO THE NORTHERN HIGH  
PLAINS OVERNIGHT THURSDAY INTO FRIDAY. RAIN WILL CONTINUE OVER  
NORTHERN CALIFORNIA INTO OREGON THURSDAY INTO FRIDAY MORNING.  
ADDITIONALLY, ONSHORE FLOW OVER THE PACIFIC NORTHWEST WILL PRODUCE  
RAIN OVER THE WASHINGTON STATE COAST AND SNOW DEVELOPING OVER  
PARTS OF THE CASCADES THURSDAY INTO FRIDAY.  
 
IN ADDITION, AN AREA OF LOW PRESSURE OVER THE NORTHERN PLAINS WILL  
MOVE EASTWARD TO THE SOUTHWESTERN WISCONSIN AND DISSIPATE BY  
THURSDAY MORNING, THANKSGIVING. AN AREA OF LIGHT SNOW WILL  
DEVELOP OVER THE PARTS OF THE UPPER MISSISSIPPI VALLEY ON  
WEDNESDAY EVENING, DISSIPATING BY THURSDAY MORNING, THANKSGIVING.  
FURTHERMORE, AN AREA OF LOW PRESSURE EAST OF THE GULF OF MAINE  
WILL MOVE NORTHWARD INTO SOUTHEASTERN CANADA BY THURSDAY MORNING.  
THE LOW WILL AID IN DEVELOPING RAIN AND SNOW OVER PARTS OF NEW  
ENGLAND ENDING BY THURSDAY MORNING, THANKSGIVING.  
 
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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