771  
FLUS43 KFSD 201001  
HWOFSD  
 
HAZARDOUS WEATHER OUTLOOK  
NATIONAL WEATHER SERVICE SIOUX FALLS SD  
501 AM CDT SUN AUG 20 2017  
 
IAZ012>014-020>022-031-032-NEZ013-014-SDZ071-211015-  
SIOUX-O'BRIEN-CLAY IA-PLYMOUTH-CHEROKEE-BUENA VISTA-WOODBURY-IDA-  
DIXON-DAKOTA-UNION-  
501 AM CDT SUN AUG 20 2017  
 
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST IOWA,  
WEST CENTRAL IOWA, NORTHEAST NEBRASKA, AND SOUTHEAST SOUTH  
DAKOTA.  
   
DAY ONE
 
TODAY AND TONIGHT  
 
SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS THE AREA  
THIS EVENING, AND CONTINUE THROUGH THE OVERNIGHT. STRONG TO SEVERE  
STORMS ARE POSSIBLE, WITH HAIL TO GOLF BALL SIZE AS THE PRIMARY  
THREAT. ISOLATED WIND GUSTS TO 60 MPH WILL ALSO BE POSSIBLE.  
   
DAYS TWO THROUGH SEVEN
 
MONDAY THROUGH SATURDAY  
 
ADDITIONAL STRONG TO SEVERE STORMS WILL BE POSSIBLE DURING THE  
LATE AFTERNOON AND EVENING ON MONDAY. THESE STORMS COULD PRODUCE  
LARGE HAIL AND DAMAGING WINDS. LOCALLY HEAVY RAIN WILL ALSO BE  
POSSIBLE.  
   
SPOTTER INFORMATION STATEMENT
 
 
SPOTTER ACTIVATION WILL BE POSSIBLE BETWEEN 8 PM AND 2 AM TONIGHT.  
 

 
 
IAZ001>003-MNZ080-081-089-090-097-098-SDZ061-062-065>070-211015-  
LYON IA-OSCEOLA-DICKINSON-MURRAY-COTTONWOOD-NOBLES-JACKSON-  
PIPESTONE-ROCK-MCCOOK-MINNEHAHA-HUTCHINSON-TURNER-LINCOLN SD-  
BON HOMME-YANKTON-CLAY SD-  
501 AM CDT SUN AUG 20 2017  
 
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST IOWA,  
SOUTHWEST MINNESOTA, AND SOUTHEAST SOUTH DAKOTA.  
   
DAY ONE
 
TODAY AND TONIGHT  
 
SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS THE AREA  
BY LATE EVENING, AND CONTINUE THROUGH THE OVERNIGHT. ISOLATED  
STRONG TO SEVERE STORMS ARE POSSIBLE, WITH HAIL TO GOLF BALL SIZE  
AS THE PRIMARY THREAT.  
   
DAYS TWO THROUGH SEVEN
 
MONDAY THROUGH SATURDAY  
 
ADDITIONAL STRONG TO SEVERE STORMS WILL BE POSSIBLE DURING THE  
LATE AFTERNOON AND EVENING ON MONDAY, WITH LARGE HAIL AGAIN THE  
PRIMARY THREAT.  
   
SPOTTER INFORMATION STATEMENT
 
 
SPOTTER ACTIVATION WILL BE POSSIBLE BETWEEN 10 PM AND 2 AM TONIGHT.  
 

 
 
MNZ071-072-SDZ038>040-050-052>060-063-064-211015-  
LINCOLN MN-LYON MN-BEADLE-KINGSBURY-BROOKINGS-GREGORY-JERAULD-  
SANBORN-MINER-LAKE-MOODY-BRULE-AURORA-DAVISON-HANSON-CHARLES MIX-  
DOUGLAS-  
501 AM CDT SUN AUG 20 2017  
 
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST  
MINNESOTA, CENTRAL SOUTH DAKOTA, EAST CENTRAL SOUTH DAKOTA, SOUTH  
CENTRAL SOUTH DAKOTA, AND SOUTHEAST SOUTH DAKOTA.  
   
DAY ONE
 
TODAY AND TONIGHT  
 
ISOLATED THUNDERSTORMS MAY MOVE THROUGH THE HIGHWAY 14 CORRIDOR  
INTO THE EARLY AFTERNOON. THESE STORMS ARE NOT EXPECTED TO BE  
SEVERE. ADDITIONAL ISOLATED THUNDERSTORMS WILL BE POSSIBLE SOUTH  
OF HIGHWAY 14 TONIGHT. THE RISK OF SEVERE WEATHER WITH THIS  
ACTIVITY IS ALSO LOW.  
   
DAYS TWO THROUGH SEVEN
 
MONDAY THROUGH SATURDAY  
 
THERE IS A CHANCE OF THUNDERSTORMS AGAIN DURING THE LATE AFTERNOON  
AND EVENING MONDAY. AN ISOLATED STRONG TO SEVERE STORM MAY DEVELOP  
SOUTH OF INTERSTATE 90 IN SOUTH CENTRAL SOUTH DAKOTA.  
   
SPOTTER INFORMATION STATEMENT
 
 
SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT.  
 

 
 
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