454  
NOUS43 KFSD 312141  
PNSFSD  
SDZ050-011745-  
 
PUBLIC INFORMATION STATEMENT  
NATIONAL WEATHER SERVICE SIOUX FALLS SD  
441 PM CDT THU JUL 31 2025  
   
..NWS DAMAGE SURVEY FOR 07/28/25 TORNADO EVENT UPDATE 1  
 
   
UPDATE  
THIS SURVEY WAS UPDATED TO DOCUMENT ANOTHER TORNADO  
OCCURRENCE IN GREGORY COUNTY NEAR LUCAS, SD WHICH WAS RATED EF-0.  
ANOTHER TORNADO WAS ALSO DOCUMENTED TO OCCUR IN LYON COUNTY, IA  
EAST OF ALVORD, WITH A RATING OF EF-U.  
   
LUCAS SD TORNADO  
 
RATING: EF-0  
ESTIMATED PEAK WIND: 85 MPH  
PATH LENGTH /STATUTE/: 2.71 MILES  
PATH WIDTH /MAXIMUM/: 50 YARDS  
FATALITIES: 0  
INJURIES: 0  
 
START DATE: JULY 28, 2025  
START TIME: 05:04 PM CDT  
START LOCATION: 1.1 WNW LUCAS / GREGORY COUNTY / SD  
START LAT/LON: 43.2971 / -99.2356  
 
END DATE: JULY 28, 2025  
END TIME: 05:09 PM CDT  
END LOCATION: 1.6 SE LUCAS / GREGORY COUNTY / SD  
END LAT/LON: 43.2718 / -99.1960  
 
A TORNADO TOUCHED DOWN IN AN OPEN FIELD APPROXIMATELY 1.1 MILES  
NORTHWEST OF LUCAS, SD. THE TORNADO MOVED TO THE SOUTHEAST ACROSS  
AN OPEN FIELD FOR A COUPLE OF MINUTES AND PASSED JUST TO THE SOUTHWEST  
OF TOWN. THE TORNADO UPROOTED A CLUSTER OF MATURE PINE TREES AT THE  
CORNER OF 284TH STREET AND 348TH AVENUE, AND SHORTLY AFTER MANGLED  
TREES IN A TREELINE JUST EAST ON 284TH STREET. THE TORNADO CONTINUED  
SOUTHEAST FOR ANOTHER TWO MINUTES ACROSS OPEN PASTURE LAND WITH  
ADDITIONAL IMPACT TO TREES ALONG THE SECTION LINE WEST OF 349TH AVENUE.  
THE TORNADO CROSSED 349TH AVENUE AND MADE A VISIBLE SHORT TRACK IN A  
CORNFIELD BEFORE LIFTING. THE TORNADO WAS RATED EF-0 WITH AN ESTIMATED  
MAXIMUM WIND SPEED OF 85 MPH.  
 
THE NWS WOULD LIKE TO THANK THE GREGORY COUNTY EMERGENCY  
MANAGER, GREGORY COUNTY SHERIFF, AND STORM CHASERS FOR  
THEIR ASSISTANCE WITH THE TORNADO SURVEY.  
   
DIXON SD TORNADO  
 
RATING: EF-1  
ESTIMATED PEAK WIND: 110 MPH  
PATH LENGTH /STATUTE/: 11.35 MILES  
PATH WIDTH /MAXIMUM/: 75 YARDS  
FATALITIES: 0  
INJURIES: 0  
 
START DATE: JULY 28, 2025  
START TIME: 04:28 PM CDT  
START LOCATION: 1.3 NW DIXON / GREGORY COUNTY / SD  
START LAT/LON: 43.3980/-99.4922  
 
END DATE: JULY 28, 2025  
END TIME: 04:49 PM CDT  
END LOCATION: 4.5 NW LUCAS / GREGORY COUNTY / SD  
END LAT/LON: 43.3245/-99.2925  
 
A TORNADO TOUCHED DOWN IN AN OPEN FIELD APPROXIMATELY  
1.3 MILES NORTHWEST OF DIXON SD. THE TORNADO MOVED SLOWLY  
TO THE SOUTHEAST, DESTROYING A FARM OUTBUILDING AND THEN  
MOVED ACROSS THE HWY 44/47 INTERSECTION WHERE IT DAMAGED  
POWER POLES AND A DOT TRUCK SHELTER. THE TORNADO CONTINUED  
SOUTHEAST FOR ANOTHER 12 MINUTES ACROSS OPEN COUNTRY BEFORE  
ROPING OUT APPROXIMATELY 4.5 MILES NORTHWEST OF LUCAS SD.  
THE TORNADO WAS RATED EF-1 WITH AN ESTIMATED MAXIMUM WIND  
GUST OF 110 MPH.  
 
THE NWS WOULD LIKE TO THANK THE GREGORY COUNTY EMERGENCY  
MANAGER, GREGORY COUNTY SHERIFF, AND STORM CHASERS FOR  
THEIR ASSISTANCE WITH THE TORNADO SURVEY.  
 
   
BONESTEEL SD TORNADO  
 
RATING: EF-2  
ESTIMATED PEAK WIND: 135 MPH  
PATH LENGTH /STATUTE/: 8.05 MILES  
PATH WIDTH /MAXIMUM/: 100 YARDS  
FATALITIES: 0  
INJURIES: 0  
 
START DATE: JULY 28, 2025  
START TIME: 05:38 PM CDT  
START LOCATION: 8.4 NW BONESTEEL / GREGORY COUNTY / SD  
START LAT/LON: 43.1963/-98.9832  
 
END DATE: JULY 28, 2025  
END TIME: 06:06 PM CDT  
END LOCATION: 0.4 N BONESTEEL / GREGORY COUNTY / SD  
END LAT/LON: 43.0831/-98.9468  
 
A TORNADO TOUCHED DOWN IN REMOTE OPEN COUNTRY APPROXIMATELY  
8.4 MILES NORTHWEST OF BONESTEEL SD. THE TORNADO DAMAGED  
POWER POLES ALONG COUNTY ROAD 57 AND THEN MOVED SOUTHEAST  
FOR 23 MINUTES ACROSS ROUGH OPEN COUNTRY WEST OF THE MISSOURI  
RIVER. THE TORNADO THEN DESTROYED A SINGLE FAMILY HOME AND  
TWO NEARBY OUTBUILDINGS ALONG HWY 1806. THE TORNADO CONTINUED  
SOUTHEAST TOWARD BONESTEEL SD, FLIPPING A CAMPER AND  
DESTROYING AN ABANDONED TRAILER BEFORE DISSIPATING OVER THE  
BALL FIELDS ON THE NORTH END OF BONESTEEL. THE TORNADO WAS  
RATED EF-2 WITH AN ESTIMATED MAXIMUM WIND GUST OF 135 MPH.  
 
THE NWS WOULD LIKE TO THANK THE GREGORY COUNTY EMERGENCY  
MANAGER, BONESTEEL FIRE CHIEF, AND STORM CHASERS FOR THEIR  
ASSISTANCE WITH THE TORNADO SURVEY.  
 
   
ALVORD IA TORNADO  
 
RATING: EF-1  
ESTIMATED PEAK WIND: 110 MPH  
PATH LENGTH /STATUTE/: 1.74 MILES  
PATH WIDTH /MAXIMUM/: 75 YARDS  
FATALITIES: 0  
INJURIES: 0  
 
START DATE: JULY 28, 2025  
START TIME: 09:30 PM CDT  
START LOCATION: 1.4 E ALVORD / LYON COUNTY / IA  
START LAT/LON: 43.3437/-96.2769  
 
END DATE: JULY 28, 2025  
END TIME: 09:32 PM CDT  
END LOCATION: 3.0 ESE ALVORD / LYON COUNTY / IA  
END LAT/LON: 43.3364/-96.2443  
 
A TORNADO TOUCHED DOWN IN A CORN FIELD APPROXIMATELY 1.4 MILES  
EAST OF ALVORD IA, DAMAGING SOME FARM STRUCTURES AND A GROVE OF  
TREES. THE TORNADO RACED SOUTHEAST AND DESTROYED A LARGE BARN  
BEFORE LIFTING IN ANOTHER CORN FIELD APPROXIMATELY 3.0 MILES  
EAST-SOUTHEAST OF ALVORD IA. THE TORNADO WAS RATED EF-1 WITH  
AN ESTIMATED MAXIMUM WIND SPEED OF 110 MPH.  
 
 
 
EF SCALE: THE ENHANCED FUJITA SCALE CLASSIFIES TORNADOES INTO THE  
FOLLOWING CATEGORIES:  
 
EF0.....65 TO 85 MPH  
EF1.....86 TO 110 MPH  
EF2.....111 TO 135 MPH  
EF3.....136 TO 165 MPH  
EF4.....166 TO 200 MPH  
EF5.....>200 MPH  
 
NOTE:  
THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO  
CHANGE PENDING FINAL REVIEW OF THE EVENTS AND PUBLICATION IN NWS  
STORM DATA.  
 
 
 
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