Overview
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Numerous storms moved through the Missouri River Valley in southeast South Dakota, and into northwest Iowa on Tuesday, September 1, 2026. The initial storms in the late afternoon produced large to very large hail, ranging from the size of quarters to as large as baseball size (2.75 inch diameter). As the storms tracked east in the evening, the primary threat transition to damaging winds, with measured wind gusts as high as 70 to 80+ mph tracking from around Vermillion, South Dakota, into the Hull and Sibley areas in far northwest Iowa. |
 Local Storm Reports from 09/01 |
Wind
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| Tree uprooted in Hull, IA (Sioux County EM) | Tree Damage in Hull, IA (Sioux County EM) | Flattened Corn Field in west Hull, IA (Sioux County EM) | 3 inch Branches Down in Vermillion, SD (Christine Lambertson) |
Hail
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| Baseball Sized Hail near Orange City, IA (Jonathan Kiel) | Golf ball to baseball sized hail near Orange City, IA (Jonathan Kiel) | Baseball Sized hail near Pickstown, SD (Jackie Gall) | Damaged Siding near Pickstown, SD (Jackie Gall) |
Storm Reports
| TIME | EVENT | CITY LOCATION | LAT.LON | DATE | MAG | COUNTY LOCATION ST | SOURCE | REMARKS | ||
| 0439 PM | Hail | 1 SSW Fairfax | 43.01N 98.90W | 9/1/2026 | E0.88 Inch | Gregory SD | Trained Spotter | |||
| 0440 PM | Hail | Fairfax | 43.02N 98.89W | 9/1/2026 | E1.00 Inch | Gregory SD | Trained Spotter | Heavy rainfall accompanied mostly dime sized hail, but a few stones were as big as a quarter. | ||
| 0453 PM | Hail | 8 WSW Pickstown | 43.02N 98.68W | 9/1/2026 | E2.50 Inch | Gregory SD | Storm Chaser | |||
| 0505 PM | Hail | 4 SSW Pickstown | 43.02N 98.56W | 9/1/2026 | E1.00 Inch | Gregory SD | CO-OP Observer | Various sizes of hail accompanied heavy rainall totaling 1.55 inches. A few of the largest stones were as big as quarters. | ||
| 0507 PM | Hail | Pickstown | 43.07N 98.53W | 9/1/2026 | E1.00 Inch | Charles Mix SD | Trained Spotter | |||
| 0512 PM | Tstm Wnd Gst | 2 WSW Pickstown | 43.05N 98.57W | 9/1/2026 | M56 MPH | Gregory SD | Mesonet | Mesonet station 244 SD RWIS Ft. Randall Dam. | ||
| 0518 PM | Hail | Pickstown | 43.06N 98.53W | 9/1/2026 | E2.75 Inch | Charles Mix SD | Trained Spotter | |||
| 0544 PM | Hail | 4 E Ravinia | 43.13N 98.35W | 9/1/2026 | E1.25 Inch | Charles Mix SD | Public | Ground covered with hail ranging from nickel to half dollar sized. | ||
| 0544 PM | Hail | 3 NW Wagner | 43.11N 98.35W | 9/1/2026 | E0.88 Inch | Charles Mix SD | Trained Spotter | |||
| 0558 PM | Tstm Wnd Gst | 1 NW Wagner | 43.09N 98.32W | 9/1/2026 | M70 MPH | Charles Mix SD | Public | Measured on personal weater station. | ||
| 0618 PM | Hail | 1 WSW Marty | 42.99N 98.44W | 9/1/2026 | E1.75 Inch | Charles Mix SD | Trained Spotter | In addition to golf ball sized hail, winds were gusting at 40-50 mph, and rainfall was heavy. | ||
| 0625 PM | Hail | 2 NNE Marty | 43.03N 98.41W | 9/1/2026 | M1.00 Inch | Charles Mix SD | Public | |||
| 0629 PM | Tstm Wnd Gst | 2 WSW Wagner | 43.07N 98.33W | 9/1/2026 | M60 MPH | Charles Mix SD | Trained Spotter | Wind gusts estimated around 60 mph were bending whole trees during the peak of the storm. Sheets of rain were falling, along with pea to dime sized hail. | ||
| 0742 PM | Hail | 8 WSW Springfield | 42.81N 98.05W | 9/1/2026 | M2.00 Inch | Bon Homme SD | Public | Window broken out. Hail lessening at 745 pm. | ||
| 0747 PM | Hail | 7 SW Springfield | 42.78N 97.99W | 9/1/2026 | M1.00 Inch | Bon Homme SD | Public | Wind driven hail broke two windows out of business. | ||
| 0757 PM | Tstm Wnd Gst | Springfield | 42.86N 97.89W | 9/1/2026 | M61 MPH | Bon Homme SD | Public | Measured by personal weather station. | ||
| 0821 PM | Tstm Wnd Dmg | 11 NE Vermillion | 42.91N 96.80W | 9/1/2026 | Union SD | Emergency Mngr | EM reported a semi blown off I-29 between mile marker 33 and 34 at approximately 8:21 pm. | |||
| 0852 PM | Hail | 3 SSE Lake Park | 43.40N 95.31W | 9/1/2026 | M0.70 Inch | Dickinson IA | CO-OP Observer | |||
| 0905 PM | Tstm Wnd Dmg | 1 W Vermillion | 42.78N 96.95W | 9/1/2026 | Clay SD | Trained Spotter | Spotter reported multiple large branches down, estimated between 3 and 5 inches at the base. Also reported the rain was flying sideways, but no hail was occurring at time of report. | |||
| 0907 PM | Tstm Wnd Dmg | Vermillion | 42.78N 96.93W | 9/1/2026 | Clay SD | Emergency Mngr | Reports of large trees down in city limits. | |||
| 0908 PM | Tstm Wnd Gst | Vermillion | 42.78N 96.93W | 9/1/2026 | M62 MPH | Clay SD | Public | Measured by personal weather staton. | ||
| 0909 PM | Tstm Wnd Gst | 1 SE Vermillion | 42.78N 96.92W | 9/1/2026 | M59 MPH | Clay SD | Public | Measured by personal weather station. | ||
| 0910 PM | Tstm Wnd Gst | 1 SSW Vermillion | 42.77N 96.93W | 9/1/2026 | M67 MPH | Clay SD | AWOS | AWOS system KVMR. | ||
| 0921 PM | Tstm Wnd Dmg | 11 SW Alcester | 42.92N 96.80W | 9/1/2026 | Union SD | Emergency Mngr | EM report of semi blown off I-29 at approximately 9:21 pm between mile marker 33 and 34. Timing of damage aligns well with radar wind surge. | |||
| 0925 PM | Tstm Wnd Dmg | Alcester | 43.03N 96.63W | 9/1/2026 | Union SD | Emergency Mngr | EM reported multiple large tree branches down of 3 inches and greater. Also reported multiple power lines down. Suspected power lines were brought down by the trees. Timing aligns well with radar velocity data. | |||
| 0926 PM | Tstm Wnd Gst | 3 SSW Beresford | 43.04N 96.80W | 9/1/2026 | M58 MPH | Union SD | Dept of Highways | |||
| 0930 PM | Tstm Wnd Gst | 10 SSE Alcester | 42.89N 96.54W | 9/1/2026 | M60 MPH | Union SD | Public | Wind measured by anemometer. | ||
| 0950 PM | Tstm Wnd Gst | 9 NNE Hawarden | 43.12N 96.43W | 9/1/2026 | M81 MPH | Sioux IA | Public | Measured by personal weather station. | ||
| 1002 PM | Tstm Wnd Dmg | Hull | 43.19N 96.14W | 9/1/2026 | Sioux IA | Emergency Mngr | Tree down on a powerline knocking out power for a few customers in Hull. Time estimated from radar. | |||
| 1012 PM | Tstm Wnd Gst | 4 SSE Rock Rapids | 43.37N 96.14W | 9/1/2026 | M64 MPH | Lyon IA | Public | Personal weather station. | ||
| 1013 PM | Hail | 3 S Sioux Center | 43.03N 96.17W | 9/1/2026 | M0.70 Inch | Sioux IA | Emergency Mngr | Dime size hail and couple stones slightly larger a couple miles south of Sioux Center. | ||
| 1018 PM | Hail | 2 NNW Orange City | 43.02N 96.07W | 9/1/2026 | M1.00 Inch | Sioux IA | Public | Report from social media. Time estimated from radar. | ||
| 1030 PM | Hail | Tyndall | 42.99N 97.87W | 9/1/2026 | E1.00 Inch | Bon Homme SD | CO-OP Observer | Mostly nickel sized hail accompanied the second of two evening storms at about 1030 pm. A few stones were as large as quarters. Rainfall total from both storms was 0.85 inch. | ||
| 1037 PM | Tstm Wnd Gst | 5 SSE Rock Rapids | 43.37N 96.13W | 9/1/2026 | M71 MPH | Lyon IA | Public | Personal weather station. | ||
| 1042 PM | Tstm Wnd Gst | 2 NE George | 43.36N 95.98W | 9/1/2026 | M73 MPH | Lyon IA | Public | Personal weather station. | ||
| 1047 PM | Tstm Wnd Gst | 5 WSW Little Rock | 43.42N 95.97W | 9/1/2026 | M63 MPH | Lyon IA | Public | Personal weather station. | ||
| 1108 PM | Tstm Wnd Gst | 4 NE Sibley | 43.45N 95.70W | 9/1/2026 | M60 MPH | Osceola IA | Public | Personal weather station. |
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