Overview
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A supercell thunderstorm produced a long swath of significant hail across portions of north central and northeastern South Dakota into west central Minnesota during the morning of August 28th. The storm produced hail to the size of tennis and baseballs, and led to extensive damage to houses, vehicles, and crops within its path. Initial estimates of the severe hail path (areas with hail of 1" or greater) show a path length of around 225 miles, stretching from Lake Oahe to west central Minnesota. This storm persisted uninterrupted for about 6 hours, from ~2:30 am to 8:30 am. During that time, the average width of the severe hail was around 6-7 miles, with the peak width around 11 miles. Additional severe thunderstorms developed as well, leading to further reports of damaging winds and large hail before exiting the area shortly after 10am. We want to thank you for all of the hail reports and pictures that you have sent to us! |
 Hail damage to a house in Edmunds County - Photo shared by Edmunds County EM |
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| Video of the radar and maximum estimated hail size. From 11PM CDT on August 27, 2021 to 11am CDT August 28, 2021 | MRMS Maximum Estimated Size of Hail (MESH) for the 24 hours prior to 1pm CDT on August 28, 2021. Hail Estimate Scale: Green = 1-2" hail, Yellow = 2-2.5" hail, and Orange/Red/Purple = 2.5"+ | Hail scar as seen on the 29th via satellite |
Photos:
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| Broken window 4.5 miles west of Warner, SD - Image from Kimberly Huber | Corn damage - Brown County EM | Hail in Butler, SD - Image from Day County Sheriff | Damage to beans 5 miles southeast of Aberdeen, SD - Photo from Kaitlyn Fleegel |
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| Closeup of damage to corn about 11 miles south-southeast of Aberdeen, SD - Photo by NWS Employee | Corn blown down from severe winds on the south side of the storm (14 miles south-southeast of Aberdeen). There were numerous localized areas of corn stocks leaning or bent over in this area. - Photo by NWS Employee | Damaged Rain Gauge - 4.5 miles west of Warner, SD - Image from Kimberly Huber | 1.5" hail 6 miles south and 2 miles west of Ipswich, SD - Photo relayed by Edmunds County EM |
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| Damage to corn to the west of Warner, SD - Photo from Marc (Twitter @LanceCasual) | Damage to beans to the west of Warner, SD - Photo from Marc (Twitter @LanceCasual) | Damage to corn to the west of Warner, SD - Photo from Marc (Twitter @LanceCasual) | Tennis ball sized hail in Grant County, South Dakota - Photo relayed by Grant County EM |
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| Damage to beans south of Ipswich - Photo by NWS Employee | Damage to corn south of Ipswich - Photo by NWS Employee | Damage to silos at Verdon - Photo by Dustin McElhone | Wind damage at Verdon - Photo by Dustin McElhone |
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| Hail near Butler around 6am - Photo courtesy of the Day County EM | Hail at Ortonville - Photo by Big Stone County EM. Hail in excess of tennis ball size was reported in and around this area. | Near Milbank around 9am - Photo by Alex Resel | Near Milbank around 9am - Photo by Alex Resel |
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| Drone photo from Sept 16th about 7 miles SSW of Mina | Drone photo from Sept 16th about 7 miles SSW of Mina |
Storm Reports (Preliminary)
Interactive map version of reports here and here.
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0232 AM HAIL 5 N LOWRY 45.39N 99.98W
08/28/2021 E2.50 INCH WALWORTH SD TRAINED SPOTTER
NUMEROUS HAILSTONES UP TO TENNIS BALL SIZED
AND DECREASED TO GOLF BALL SIZED BEFORE
ENDING. GROUND WAS WHITE WITH HAIL.
0650 AM HAIL 7 SSW SUMMIT 45.21N 97.09W
08/28/2021 E2.50 INCH GRANT SD PUBLIC
TIME ESTIMATED BASED ON RADAR.
0733 AM HAIL 2 W MILBANK 45.22N 96.68W
08/28/2021 E1.25 INCH GRANT SD TRAINED SPOTTER
HAILED FOR 5 TO 10 MINUTES.
0915 AM HAIL 3 NW MILBANK 45.26N 96.68W
08/28/2021 M2.50 INCH GRANT SD PUBLIC
RELAYED THROUGH GRANT CO EM.
0919 AM HAIL MILBANK 45.22N 96.64W
08/28/2021 E1.75 INCH GRANT SD TRAINED SPOTTER
0935 AM HAIL BIG STONE CITY 45.30N 96.47W
08/28/2021 E1.25 INCH GRANT SD PUBLIC
0320 AM HAIL 3 S ROSCOE 45.40N 99.34W
08/28/2021 E1.00 INCH EDMUNDS SD TRAINED SPOTTER
0325 AM HAIL 4 N CRAVENS CORNER 45.50N 98.92W
08/28/2021 E1.00 INCH EDMUNDS SD TRAINED SPOTTER
0348 AM HAIL 5 SW IPSWICH 45.40N 99.10W
08/28/2021 E1.75 INCH EDMUNDS SD PUBLIC
10 WINDOWS DESTROYED.
0400 AM HAIL 7 S MINA 45.34N 98.76W
08/28/2021 E1.00 INCH EDMUNDS SD TRAINED SPOTTER
50 MPH OR STRONGER WINDS.
0408 AM HAIL 7 SSW MINA 45.35N 98.82W
08/28/2021 M2.50 INCH EDMUNDS SD TRAINED SPOTTER
MEASURED TENNIS BALL SIZED HAIL. SEVERAL
WINDOWS BROKEN ON HOUSE. HAIL IS COVERING
THE GROUND.
0710 AM HAIL 5 NE LOYALTON 45.34N 99.21W
08/28/2021 E1.00 INCH EDMUNDS SD TRAINED SPOTTER
0544 AM HAIL BUTLER 45.26N 97.71W
08/28/2021 M2.00 INCH DAY SD LAW ENFORCEMENT
PICTURE OF HAIL OF 2 INCHES IN DIAMETER.
MENTIONED THAT SOME WERE A LITTLE LARGER.
THERE WAS ALSO A LARGE TREE LIMB DOWN AND
WINDSHIELDS BROKEN JUST WEST OF TOWN.
0603 AM HAIL 7 ENE LILY 45.23N 97.56W
08/28/2021 E1.75 INCH DAY SD TRAINED SPOTTER
GOLF BALL SIZED HAIL IS ONGOING.
0825 AM HAIL 7 SE WEBSTER 45.27N 97.42W
08/28/2021 E1.00 INCH DAY SD TRAINED SPOTTER
0830 AM HAIL 9 SSW WAUBAY 45.22N 97.38W
08/28/2021 E2.50 INCH DAY SD PUBLIC
RADAR ESTIMATED, RELAYED THROUGH FACEBOOK.
0430 AM HAIL 6 W WARNER 45.33N 98.62W
08/28/2021 E1.50 INCH BROWN SD TRAINED SPOTTER
0434 AM HAIL WARNER 45.33N 98.49W
08/28/2021 E1.75 INCH BROWN SD LAW ENFORCEMENT
HAILING FOR THE LAST 10 MINUTES.
0715 AM HAIL 4 NNW HOUGHTON 45.81N 98.25W
08/28/2021 E1.00 INCH BROWN SD PUBLIC
0753 AM HAIL ORTONVILLE 45.30N 96.44W
08/28/2021 M1.00 INCH BIG STONE MN PUBLIC
REPORT RELAYED THROUGH SOCIAL MEDIA.
0942 AM HAIL ODESSA 45.26N 96.33W
08/28/2021 E0.75 INCH BIG STONE MN PUBLIC
REPORT FROM MPING: DIME (0.75 IN.).
0957 AM HAIL 3 NE CORRELL 45.26N 96.12W
08/28/2021 M2.75 INCH BIG STONE MN PUBLIC
RELAYED THROUGH FB.
0135 AM HAIL GLENHAM 45.53N 100.27W
08/28/2021 E1.25 INCH WALWORTH SD TRAINED SPOTTER
0156 AM HAIL 1 ENE MOBRIDGE 45.55N 100.42W
08/28/2021 M0.50 INCH WALWORTH SD TRAINED SPOTTER
0156 AM HAIL 3 NNE SELBY 45.55N 100.01W
08/28/2021 M1.00 INCH WALWORTH SD TRAINED SPOTTER
0949 AM TSTM WND DMG ODESSA 45.26N 96.33W
08/28/2021 BIG STONE MN PUBLIC
REPORT FROM MPING: 1-INCH TREE LIMBS BROKEN;
SHINGLES BLOWN OFF.
1231 AM TSTM WND GST 1 E HAYES 44.37N 101.00W
08/27/2021 M59 MPH STANLEY SD PUBLIC
PERSONAL WEATHER STATION.
1249 AM TSTM WND GST 10 SW CHANTLER CREEK RE 44.39N 100.77W
08/27/2021 M64 MPH STANLEY SD MESONET
MESONET STATION 202 HAYES (SDDOT).
0808 AM TSTM WND GST 1 WNW MELLETTE 45.16N 98.51W
08/28/2021 M64 MPH SPINK SD MESONET
MESONET STATION 175 MELLETTE (SDDOT).
0358 AM TSTM WND GST 9 NNW VIVIAN 44.05N 100.33W
08/27/2021 M61 MPH LYMAN SD MESONET
MESONET STATION 13 VIVIAN (SDDOT).
0844 AM TSTM WND GST 7 SSW SUMMIT 45.21N 97.09W
08/28/2021 E65 MPH GRANT SD PUBLIC
0944 AM TSTM WND GST 3 SW BIG STONE CITY 45.27N 96.51W
08/28/2021 M70 MPH GRANT SD MESONET
MESONET STATION 292 7NE MILBANK (SDDOT).
0943 AM TSTM WND GST 3 W ODESSA 45.26N 96.38W
08/28/2021 M62 MPH BIG STONE MN MESONET
MNDOT RWIS.
Radar and Rain Reports
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| Radar reflectivity of a long-track supercell south of Ipswich at 3:58 am. The large green spike pointing to the left of the storm is called a Three-Body Scatter Spike, and is an indication of very large hail. | Radar cross-section of the storm south of Ipswich at 3:58 am. | Radar reflectivity of a long-track supercell south of Webster at 6:03 am. The large green spike pointing to the right of the storm is called a Three-Body Scatter Spike, and is an indication of very large hail. | Radar cross-section of the storm south of Webster at 6:03 am. |
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| Radar reflectivity of another supercell west of Milbank at 9:02 am. A Three-Body Scatter Spike can be seen with this storm as well. | Radar cross-section of the storm west of Milbank at 9:02 am. |
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