534  
FXUS01 KWBC 211959  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
358 PM EDT SAT OCT 21 2017  
 
VALID 00Z SUN OCT 22 2017 - 00Z TUE OCT 24 2017  
 
...SEVERE THUNDERSTORMS AND FLASH FLOODING POSSIBLE FOR PARTS OF  
THE PLAINS AND MISSISSIPPI VALLEY THROUGH SATURDAY NIGHT...  
 
...HEAVY RAIN AND HIGHER ELEVATION SNOW CONTINUE FOR THE NORTHWEST  
THROUGH SUNDAY NIGHT...  
 
A COLD FRONT MAKING ITS WAY THROUGH THE PLAINS WILL CONTINUE TO  
MOVE EASTWARD OVER THE NEXT COUPLE OF DAYS, MAKING ITS WAY INTO  
THE MISSISSIPPI VALLEY BY SUNDAY MORNING AND INTO THE OHIO VALLEY  
AND SOUTHEAST BY MONDAY MORNING. THIS COLD FRONT AND AN  
UPPER-LEVEL TROUGH WILL SUPPORT WIDESPREAD RAIN AND THUNDERSTORMS  
ALONG AND AHEAD OF THE FRONT. THROUGH SATURDAY NIGHT, THERE IS AN  
ENHANCED RISK OF SEVERE THUNDERSTORMS AND A SLIGHT RISK OF FLASH  
FLOODING FOR PORTIONS OF THE SOUTHERN PLAINS TO THE WESTERN MIDDLE  
MISSISSIPPI VALLEY. SEE THE STORM PREDICTION CENTER FOR DETAILS ON  
THE SEVERE THREAT. THE RISK FOR HEAVY RAINFALL THAT COULD CAUSE  
FLASH FLOODING WILL SHIFT EASTWARD AHEAD OF THE COLD FRONT. THE  
LOWER MISSISSIPPI VALLEY IS UNDER A SLIGHT RISK FOR EXCESSIVE  
RAINFALL SUNDAY INTO SUNDAY NIGHT, AND ON MONDAY, PORTIONS OF THE  
SOUTHEAST AND TENNESSEE VALLEY ARE UNDER A SLIGHT RISK.  
 
THE PACIFIC NORTHWEST WILL CONTINUE TO SEE HEAVY RAIN THROUGH  
SUNDAY MORNING, WHICH COULD CAUSE FLOODING SINCE SEVERAL INCHES OF  
RAIN ARE FORECAST IN SOME AREAS. THE NORTHERN ROCKIES WILL SEE  
HEAVY PRECIPITATION AS WELL, BUT SOME OF THIS WILL FALL AS SNOW  
FOR THE HIGHER ELEVATIONS. THE NORTHWEST IS EXPECTED TO DRY OUT BY  
MONDAY AFTERNOON.  
 
ELSEWHERE, HOT, DRY, AND WINDY CONDITIONS WILL LEAD TO FIRE  
CONCERNS ALONG THE SOUTHERN AND CENTRAL CALIFORNIA COAST OVER THE  
NEXT FEW DAYS. MUCH OF THE U.S. IS EXPECTED TO BE WARMER THAN  
NORMAL, WITH HIGH TEMPERATURES UP TO 20 DEGREES ABOVE AVERAGE IN  
THE NORTHEAST. SCATTERED THUNDERSTORMS WILL PERSIST IN FLORIDA, AS  
EASTERLY FLOW AND PLENTY OF MOISTURE CONTINUE.  
 
TATE  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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