Overview
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A very warm and humid late July afternoon and subtle low pressure in central South Dakota caused isolated supercell thunderstorms to merge into a line of damaging winds on the evening of Monday July 28th. An initial supercell in central South Dakota tracking southeast through Gregory County, SD produced a few tornadoes. One mile northwest of Dixon, a tornado produced EF-1 damage to a farm outbuilding, some power poles, and a DOT truck shelter. Then the same cell produced an EF-0 tornado near Lucas, SD, resulting in tree damage. Finally, about eight miles northwest of Bonesteel, the same cell produced EF-2 tornado damage to power poles, a single-family home, two outbuildings, a camper, and an abandoned trailer. As the storms became more numerous farther east, scattered thunderstorms merged into a derecho, with many locations impacted by destructive straight-line winds. Wind gusts of 55 to 99 mph were common across the southeast quarter of South Dakota and the northern half of Iowa. Another two tornadoes developed from a circulation embedded within the derecho, east of Alvord, Iowa. This circulation produced EF-1 damage to some farm structures, a large barn, and a grove of trees initially and then later touched down in an open field resulting in EF-U rating. The greatest concentration of wind damage was near a line from Beresford, SD, to Spencer, IA. Numerous reports of strong wind gusts and photos of structural damage were collected across the area. |
 Regional Radar Loop |
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| Dixon SD Tornado (Credit: Jordan Hall) |
Severe Weather Warnings (July 28, 2025) | Local Storm Reports (July 28, 2025) |
Tornadoes
Select a tornado from the table to zoom into the track and view more information. The default table view is limited to 8 tracks, but can be scrolled by a mouse wheel or dynamically expanded. Additionally, the table can fill the entire window by clicking the small circular expanding arrow icon at the very top right of the table and returned to its original size by clicking the button again. The side information panel that opens over the map can be closed using the "X" on the upper right corner of the pop-up. Zoom into the map and click damage points to see detailed information and pictures from the surveys.
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NOTE: times shown below are local to your device's time zone. |
The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:
| EF0 Weak 65-85 mph |
EF1 Moderate 86-110 mph |
EF2 Significant 111-135 mph |
EF3 Severe 136-165 mph |
EF4 Extreme 166-200 mph |
EF5 Catastrophic 200+ mph |
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| Tornadoes that fail to impact any ratable damage indicators on the EF-Scale are rated EF-Unknown (EF-U) | |||||
Storm Reports
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| Map of Severe Weather Report - July 28, 2025 |
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1117 PM Tstm Wnd Dmg Alton 42.99N 96.01W
07/28/2025 Sioux IA Public
On the east side of town, an enclosed
trailer was flipped on its side by
thunderstorm wind gusts.
1114 PM Tstm Wnd Dmg Sanborn 43.18N 95.66W
07/28/2025 O'Brien IA Public
Numerous tree branches broken, ranging from
6 to 18 inches in diameter. Some fell on
houses. Many streets are blocked.
1042 PM Tstm Wnd Gst 4 WNW Spencer 43.17N 95.22W
07/28/2025 M92 MPH Clay IA ASOS
ASOS station KSPW Spencer Municipal Airport.
1040 PM Tstm Wnd Dmg Alton 42.99N 96.01W
07/28/2025 Sioux IA Public
Social media report of building damage at
the lumber yard in Alton. Estimated winds of
80 kts. Timing and winds estimated by radar.
1039 PM Tstm Wnd Gst 4 WNW Spencer 43.17N 95.22W
07/28/2025 M87 MPH Clay IA ASOS
ASOS station KSPW Spencer Municipal Airport.
1037 PM Tstm Wnd Gst 3 SSE Lake Park 43.40N 95.31W
07/28/2025 M63 MPH Dickinson IA Mesonet
Personal Weather Station (KIALAKEP2) near
Milford measured a 63 mph wind gust.
1030 PM Tstm Wnd Gst 3 WSW Lakeside 42.60N 95.22W
07/28/2025 M60 MPH Buena Vista IA AWOS
AWOS station KSLB Storm Lake Airport.
1025 PM Tstm Wnd Dmg Spencer 43.15N 95.15W
07/28/2025 Clay IA Public
Trees uprooted in town. Report via mPING.
1024 PM Tstm Wnd Gst 7 ENE Melvin 43.32N 95.48W
07/28/2025 M58 MPH Osceola IA Mesonet
A personal weather station (KIAMAYCI1) near
Melvin recorded a 58 mph wind gust.
1016 PM Tstm Wnd Dmg Sheldon 43.18N 95.84W
07/28/2025 O'Brien IA Public
Many large branches across town knocked down
by thunderstorm wind gusts. A camper was
flipped upside down on the east side of
town.
1008 PM Tstm Wnd Dmg Primghar 43.09N 95.63W
07/28/2025 O'Brien IA Trained Spotter
Highway 59 across the entire town is closed
due to so many trees knocked down onto the
road by thunderstorm wind gusts.
1008 PM Tstm Wnd Dmg Primghar 43.09N 95.63W
07/28/2025 O'Brien IA Emergency Mngr
Highway 59 across the entire town is closed
due to so many trees knocked down onto the
road by thunderstorm wind gusts.
1008 PM Tstm Wnd Dmg Primghar 43.09N 95.63W
07/28/2025 O'Brien IA Trained Spotter
Highway 59 across the entire town is closed
due to so many trees knocked down onto the
road by thunderstorm wind gusts.
1002 PM Tstm Wnd Dmg 3 N Meriden 42.84N 95.64W
07/28/2025 Cherokee IA Public
Large trees snapped and uprooted.
1000 PM Tstm Wnd Dmg 5 WNW Larrabee 42.88N 95.64W
07/28/2025 Cherokee IA Trained Spotter
Large trees down on farmstead.
0952 PM Tstm Wnd Gst 4 SSE Rock Rapids 43.37N 96.14W
07/28/2025 M79 MPH Lyon IA Mesonet
Personal weather station.
0950 PM Tstm Wnd Dmg 1 ENE Sheldon 43.19N 95.82W
07/28/2025 O'Brien IA Public
Social media report with pictures of damage
done to and RV business in Sheldon. Winds
approximately 90 kts. Timing and wind speeds
estimated by radar.
0950 PM Tstm Wnd Dmg 2 SSE Ashton 43.28N 95.78W
07/28/2025 Osceola IA Trained Spotter
Large tree blown down into house and two
trees blown onto garage.
0945 PM Tstm Wnd Gst 2 NNE Sheldon 43.21N 95.83W
07/28/2025 M53 MPH O'Brien IA AWOS
The Sheldon AWOS recorded a 53 mph wind
gust.
0941 PM Tstm Wnd Gst 2 NW Orange City 43.02N 96.08W
07/28/2025 M92 MPH Sioux IA Public
Personal weather station.
0939 PM Tstm Wnd Gst 2 WSW Sioux Center 43.06N 96.22W
07/28/2025 M99 MPH Sioux IA Mesonet
Personal weather station.
0935 PM Tornado 5 E Alvord 43.35N 96.21W
07/28/2025 Lyon IA Public
Track in fields identified by drone video.
0934 PM Tstm Wnd Gst 2 S Lester 43.41N 96.33W
07/28/2025 M72 MPH Lyon IA Mesonet
Personal weather station.
0934 PM Tstm Wnd Dmg Orange City 43.00N 96.06W
07/28/2025 Sioux IA Emergency Mngr
Trees knocked down by thunderstorm wind
gusts.
0932 PM Tstm Wnd Dmg Hull 43.19N 96.14W
07/28/2025 Sioux IA Public
Social media picture of large limb snapped
from a tree.
0930 PM Tstm Wnd Dmg Rock Valley 43.20N 96.30W
07/28/2025 Sioux IA Trained Spotter
Spotter reported a 2-3 foot in diameter live
tree branch that was broken and down. Time
of occurrence estimated by radar. Radar
estimated winds of 86 kts.
0930 PM Tstm Wnd Dmg Rock Rapids 43.43N 96.17W
07/28/2025 Lyon IA Trained Spotter
Spotter reported a 2-3 foot in diameter live
tree branch down. Time estimated by radar,
with an estimated wind speed of 86 kts.
0930 PM Tstm Wnd Gst 1 SSW Hawarden 42.99N 96.49W
07/28/2025 M65 MPH Sioux IA Mesonet
Personal weather station.
0930 PM Tstm Wnd Gst 1 NE Maurice 42.98N 96.17W
07/28/2025 M61 MPH Sioux IA AWOS
AWOS station KSXK 1 NE Maurice.
0930 PM Tornado 1 E Alvord 43.34N 96.27W
07/28/2025 Lyon IA NWS Storm Survey
Mangled trees south of a convergent cord
damage path.
0930 PM Tstm Wnd Dmg Rock Valley 43.20N 96.30W
07/28/2025 Sioux IA Trained Spotter
Spotter reported a 2-3 foot section of a
live tree down. Radar estimated time of 9:30
CDT and radar estimated wind speed of 86
kts.
0926 PM Tstm Wnd Dmg Sioux Center 43.08N 96.17W
07/28/2025 Sioux IA Emergency Mngr
Trees knocked down by thunderstorm wind
gusts.
0922 PM Tstm Wnd Dmg 8 NNW Ireton 43.08N 96.35W
07/28/2025 Sioux IA Emergency Mngr
EM reports a tree with a roughly 5 foot
diameter knocked down. Tree appears at least
partially rotted from photos.
0919 PM Tstm Wnd Gst 3 SSW Beresford 43.04N 96.80W
07/28/2025 M67 MPH Union SD Mesonet
Personal weather station.
0913 PM Tstm Wnd Gst 3 SSW Beresford 43.04N 96.80W
07/28/2025 M75 MPH Union SD Mesonet
Mesonet station 16 SD RWIS Beresford.
0910 PM Tstm Wnd Dmg Hawarden 43.00N 96.48W
07/28/2025 Sioux IA Emergency Mngr
Trees knocked down by thunderstorm wind
gusts.
0910 PM Tstm Wnd Dmg Hawarden 43.00N 96.48W
07/28/2025 Sioux IA Emergency Mngr
Trees knocked down by thunderstorm wind
gusts.
0909 PM Tstm Wnd Gst 1 NNE Harrisburg 43.44N 96.69W
07/28/2025 M68 MPH Lincoln SD Mesonet
Personal weather station.
0902 PM Tstm Wnd Dmg Alcester 43.02N 96.63W
07/28/2025 Union SD Emergency Mngr
Tree and powerline damage.
0859 PM Tstm Wnd Gst 3 NNW Sioux Falls 43.58N 96.75W
07/28/2025 M66 MPH Minnehaha SD ASOS
ASOS station KFSD Sioux Falls Airport.
0859 PM Tstm Wnd Dmg 6 N Beresford 43.16N 96.77W
07/28/2025 Lincoln SD Law Enforcement
200-foot cell tower was destroyed by winds
estimated at least 90 mph.
0857 PM Tstm Wnd Gst 3 ESE Parker 43.37N 97.08W
07/28/2025 M85 MPH Turner SD Mesonet
Mesonet station 310 SD RWIS Parker.
0856 PM Tstm Wnd Gst 1 N Tea 43.47N 96.84W
07/28/2025 M68 MPH Lincoln SD Public
Personal weather station.
0855 PM Tstm Wnd Gst 6 SSE Centerville 43.04N 96.90W
07/28/2025 M77 MPH Clay SD Mesonet
Mesonet station BFMS2 Beresford 7 WSW.
0853 PM Tstm Wnd Dmg Beresford 43.08N 96.78W
07/28/2025 Union SD Emergency Mngr
Tree and powerline damage.
0853 PM Tstm Wnd Dmg 2 NE Davis 43.29N 96.97W
07/28/2025 Turner SD Emergency Mngr
Thunderstorm wind gusts tore the roof off a
house and uprooted a large tree. Time
estimated from radar.
0851 PM Tstm Wnd Gst 4 E Irene 43.08N 97.08W
07/28/2025 M87 MPH Turner SD Mesonet
Mesonet station 320 SD RWIS IRENE.
0851 PM Tstm Wnd Gst 5 W Sioux Falls 43.53N 96.83W
07/28/2025 M62 MPH Minnehaha SD Mesonet
Personal weather stataion.
0849 PM Tstm Wnd Dmg 5 W Sioux Falls 43.53N 96.82W
07/28/2025 Minnehaha SD Public
Large tree limbs broken down by winds
estimated at 65 mph.
0848 PM Tstm Wnd Gst 4 NNE Tea 43.50N 96.81W
07/28/2025 M60 MPH Minnehaha SD Mesonet
Personal weather station.
0836 PM Tstm Wnd Gst Irene 43.08N 97.16W
07/28/2025 M66 MPH Turner SD Mesonet
Personal weather station.
0829 PM Tstm Wnd Gst 6 NNE Monroe 43.56N 97.16W
07/28/2025 M64 MPH McCook SD Mesonet
Personal weather station.
0825 PM Tstm Wnd Gst 7 ESE Menno 43.21N 97.45W
07/28/2025 M62 MPH Hutchinson SD Mesonet
Mesonet station MNMS2 Menno 7ESE.
0818 PM Tstm Wnd Gst 7 NE Lesterville 43.10N 97.48W
07/28/2025 M60 MPH Yankton SD Mesonet
Personal weather station.
0805 PM Tstm Wnd Gst 3 S Scotland 43.10N 97.72W
07/28/2025 M63 MPH Bon Homme SD Mesonet
Mesonet station DVI02596 Scotland.
0759 PM Tstm Wnd Gst 2 WNW Scotland 43.16N 97.76W
07/28/2025 M72 MPH Bon Homme SD Mesonet
Personal weather station.
0753 PM Tstm Wnd Gst 6 SW Scotland 43.08N 97.81W
07/28/2025 M60 MPH Bon Homme SD Mesonet
Personal weather station.
0740 PM Tstm Wnd Gst 4 NE Dante 43.08N 98.13W
07/28/2025 M60 MPH Charles Mix SD Mesonet
Mesonet station 324 SD RWIS WAGNER.
0740 PM Tstm Wnd Gst 1 ESE Mitchell 43.72N 98.01W
07/28/2025 M55 MPH Davison SD Mesonet
Personal weather station.
0717 PM Tstm Wnd Gst 1 NW Wagner 43.09N 98.32W
07/28/2025 M72 MPH Charles Mix SD Mesonet
Personal weather station.
0702 PM Hail 5 SW Plankinton 43.66N 98.54W
07/28/2025 E0.88 Inch Aurora SD Trained Spotter
0646 PM Funnel Cloud White Lake 43.73N 98.71W
07/28/2025 Aurora SD Trained Spotter
Funnel cloud developing right over White
Lake now.
0615 PM Hail Burke 43.18N 99.29W
07/28/2025 M1.75 Inch Gregory SD Trained Spotter
15 minutes of hail varied in size from
quarters to golf balls, with most of them
quarter to half dollar sized.
0601 PM Tornado 3 NNW Bonesteel 43.11N 98.96W
07/28/2025 Gregory SD Storm Chaser
Major damage to a single family residence.
Two nearby outbuildings destroyed.
0506 PM Tornado 8 NNE Burke 43.29N 99.22W
07/28/2025 Gregory SD Law Enforcement
Tornado uprooted 3 mature pine trees.
0435 PM Tornado Dixon 43.38N 99.47W
07/28/2025 Gregory SD Trained Spotter
Confirmed tornado on the ground along
Highway 44 near Dixon.
0428 PM Tornado 1 NW Dixon 43.40N 99.49W
07/28/2025 Gregory SD Storm Chaser
Initial touchdown of tornado which traveled
for 11 miles to east-southeast.
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Tornado Photos
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| Dixon SD Tornado (Credit: Jordan Hall) |
Dixon SD Tornado (Credit: Jordan Hall) |
North of Bonesteel SD Tornado (Credit: EM Brad Christensen) |
North of Bonesteel SD Tornado (Credit: EM Brad Christensen) |
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| Alvord IA Tornado (Credit: Dan Gottschalk) |
Alvord IA (Credit: Dan Gottschalk) |
Alvord IA (Credit: Dan Gottschalk) |
Alvord IA (Credit: Dan Gottschalk) |
Wind Damage Photos
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| South of Davis SD (Credit: Kayla Beaner) |
Harrisburg SD (Credit: Kassidy Froderman) |
Sioux Falls SD (Credit: Caleb Cooke |
Sioux Falls SD (Credit: Brittney Wise) |
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| Orange City IA (Credit: Ben Boice) |
South of Alton IA (Credit: Ams Rassel) |
George IA (Credit: Sharon Kanengieter) |
Meriden IA (Credit: Dave KA90ZP) |
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| Hartley IA (Credit: Heather Nitzel) |
Linn Grove IA (Credit: Ezra McKenzie Mattila) |
Spencer IA (Credit: Ardelle Brehmer Faulkender) |
Spencer IA (Credit: Jamie Rusk-Blume) |
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| Spencer IA (Credit: Steve Grimmius) |
Lake Park IA (Credit: Amanda Sether) |
Orange City IA (Credit: Christina Blezien) |
Beresford SD (Credit: Stephanie Bartlett) |
Additional Information
Severe Thunderstorm Outlook, Watches, and Discussions
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| SPC Severe Thunderstorm Outlook issued 1236 PM CDT |
SPC Mesoscale Discussion issued 247 PM CDT |
Severe Thunderstorm Watch issued 345 PM CDT |
SPC Mesoscale Discussion issued 549 PM CDT |
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| Severe Thunderstorm Watch issued 656 PM CDT |
SPC Mesoscale Discussion issued 813 PM CDT |
SPC Mesoscale Discussion issued 939 PM CDT |
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