917  
FXUS01 KWBC 180821  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
421 AM EDT THU OCT 18 2018  
 
VALID 12Z THU OCT 18 2018 - 12Z SAT OCT 20 2018  
   
..HEAVY RAIN POSSIBLE OVER PARTS OF THE WESTERN GULF COAST
 
 
...RAIN WILL PERSIST ACROSS PARTS OF THE SOUTHERN PLAINS WITH MORE  
AREAS OF HEAVY RAIN AND FLASH FLOODING EXPECTED...  
 
...TEMPERATURES WILL BE 10 TO 25 DEGREES BELOW AVERAGE OVER PARTS  
OF THE SOUTHERN PLAINS AND SOUTHERN ROCKIES...  
 
UPPER-LEVEL ENERGY OVER THE SOUTHWEST/GREAT BASIN WILL SLOWLY MOVE  
EASTWARD TO PARTS OF THE CENTRAL PLAINS TO THE MIDDLE MISSISSIPPI  
VALLEY BY FRIDAY EVENING. MOISTURE FLOWING NORTHWESTWARD OUT OF  
THE GULF OF MEXICO AIDED BY THE UPPER-LEVEL ENERGY WILL PRODUCING  
RAIN AND SNOW OVER PARTS OF THE GREAT BASIN WILL SLOWLY MOVE INTO  
PARTS OF THE CENTRAL ROCKIES BY THURSDAY EVENING, ENDING BY FRIDAY  
AFTERNOON. RAIN WILL DEVELOP OVER PARTS OF THE SOUTHERN HIGH  
PLAINS THAT WILL MOVE INTO THE SOUTHERN PLAINS BY FRIDAY MORNING  
AND INTO PARTS OF THE LOWER MISSISSIPPI VALLEY/OHIO VALLEY BY  
FRIDAY EVENING. THE RAIN WILL END OVER THE SOUTHERN HIGH PLAINS  
BY FRIDAY MORNING. IN ADDITION, THE ONSHORE FLOW OFF THE WESTERN  
GULF OF MEXICO WILL ALSO AID IN DEVELOPING SHOWERS AND  
THUNDERSTORMS OVER PARTS OF THE WESTERN GULF COAST THROUGH FRIDAY  
EVENING. FURTHERMORE, EASTERLY FLOW OFF THE ATLANTIC WILL AID IN  
PRODUCING SHOWERS AND THUNDERSTORMS OVER PARTS OF FLORIDA THROUGH  
FRIDAY EVENING, TOO.  
 
MEANWHILE, AN UPPER-LEVEL TROUGH OVER THE NORTHEAST WILL AID IN  
PRODUCING LIGHT SNOW AND RAIN OVER PARTS OF NORTHERN NEW ENGLAND  
THROUGH THURSDAY EVENING. A FRONT MOVING SOUTHEASTWARD FROM  
CENTRAL CANADA WILL MOVE TO THE UPPER GREAT LAKES TO PARTS OF THE  
SOUTHERN HIGH PLAINS BY FRIDAY EVENING. THE BOUNDARY WILL AID IN  
PRODUCING RAIN OVER PARTS OF THE UPPER GREAT LAKES/UPPER  
MISSISSIPPI VALLEY ON FRIDAY MORNING THAT WILL MOVE INTO THE GREAT  
LAKES BY FRIDAY EVENING. ADDITIONAL RAIN WILL DEVELOP OVER PARTS  
OF THE UPPER MISSISSIPPI VALLEY ON FRIDAY EVENING INTO SATURDAY.  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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