Public Information Statement
Issued by NWS Sioux Falls, SD
Issued by NWS Sioux Falls, SD
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. $$ NWS Sioux Falls