Overview
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Several supercell thunderstorms produced brief tornadoes and large hail on the evening of Sunday May 31st, 2026. A few isolated severe thunderstorms developed in southeast South Dakota, tracking initially north then more east. An early, near-stationary storm produced flash flooding in Emery, SD. Through the evening, this activity had numerous storm mergers with slow moving storms. Storms and tornado threat weakened after sunset, with mainly a large hail threat as storms progressed eastward into northwest Iowa. |
 Regional Radar Loop from Sunday May 31st, 2026 |
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| Warnings issued from May 31st - Severe Thunderstorm Warnings (yellow) and Tornado Warnings (red) | Preliminary Storm Reports from May 31st, 2026 | SPC Severe Thunderstorm Watch #257 through 1 AM Monday June 1st, 2026 |
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) | |||||
Hail
Hail
Hail up to golf ball size was reported with the strongest storms. Photos will be posted if/when available.
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Flooding
Slow moving storms produced locally heavy rainfall with flash flooding reported via street flooding in Emery, SD.
Flood Products and Images
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| Flash Flood Warning issued at 551 PM CDT | 3 Day Rainfall Totals from May 29-31, 2026 |
Photos & Video
Several photos and videos from the event will be posted if/when available.
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Radar
Radar images from KFSD radar
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| Radar Reflectivity and Storm Relative Velocity at 606 PM CDT | Radar Reflectivity and Storm Relative Velocity at 810 PM CDT | Radar Reflectivity and Storm Relative Velocity at 850 PM CDT |
Storm Reports
Preliminary Local Storm Report...Summary
National Weather Service Sioux Falls SD
217 PM CDT Tue Jun 2 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0435 PM Hail 2 NNW Emery 43.63N 97.64W
05/31/2026 E0.88 Inch Hanson SD Trained Spotter
0507 PM Hail 2 W Vilas 44.01N 97.63W
05/31/2026 M1.25 Inch Miner SD Trained Spotter
0530 PM Hail 1 WSW Emery 43.60N 97.63W
05/31/2026 E1.00 Inch Hanson SD Trained Spotter
Very heavy rain along with penny to quarter
sized hail. Rainfall is already over 3
inches.
0558 PM Flash Flood Emery 43.60N 97.62W
05/31/2026 Hanson SD Public
Several social media photos of flooded
streets and backyards in Emery. Time
estimated.
0600 PM Funnel Cloud 1 N Bridgewater 43.57N 97.50W
05/31/2026 McCook SD Trained Spotter
0607 PM Tornado 1 NW Bridgewater 43.56N 97.52W
05/31/2026 McCook SD Storm Chaser
Tornado is kicking up dust from the ground
now.
0616 PM Hail 5 N Bridgewater 43.62N 97.49W
05/31/2026 E1.00 Inch McCook SD Trained Spotter
Hail was jagged, with some as long as a
quarter, but most of it was pea to nickel
sized. Heavy rainfall so far has been 1.75
inch.
0651 PM Hail 2 N Canistota 43.62N 97.29W
05/31/2026 E1.75 Inch McCook SD Public
Most hail was pea to quarter sized, but a
few were as big as golf balls. Farm fields
further north are more damaged than his.
0658 PM Hail 4 NE Canistota 43.64N 97.23W
05/31/2026 E1.50 Inch McCook SD Trained Spotter
Ping pong ball sized hail damaged young
crops in fields.
0720 PM Hail 5 NW Wall Lake 43.57N 97.03W
05/31/2026 M1.00 Inch Minnehaha SD Public
Photo and report via social media.
0723 PM Rain Emery 43.60N 97.62W
05/31/2026 M3.50 Inch Hanson SD Law Enforcement
0726 PM Hail 2 WSW Humboldt 43.63N 97.12W
05/31/2026 M1.00 Inch Minnehaha SD Trained Spotter
In addition to hail up to the size of
quarters, heavy rainfall was reported.
0733 PM Hail 4 SW Hurley 43.24N 97.15W
05/31/2026 E1.00 Inch Turner SD Fire Dept/Rescue
0739 PM Hail 3 SSW Humboldt 43.61N 97.09W
05/31/2026 E1.00 Inch Minnehaha SD Public
Report and video via social media.
0740 PM Hail 2 ESE Humboldt 43.64N 97.03W
05/31/2026 M1.00 Inch Minnehaha SD Public
Report and photo via social media.
0754 PM Hail 2 WNW Davis 43.27N 97.04W
05/31/2026 E1.00 Inch Turner SD Public
0756 PM Hail Parker 43.40N 97.14W
05/31/2026 E1.00 Inch Turner SD Public
Report and photo via social media.
0811 PM Tornado 4 W Wall Lake 43.53N 97.03W
05/31/2026 Minnehaha SD NWS Employee
Radar confirmed tonado.
0817 PM Hail Wakonda 43.01N 97.11W
05/31/2026 E0.88 Inch Clay SD Trained Spotter
0836 PM Hail 2 N Davis 43.29N 97.00W
05/31/2026 E1.00 Inch Turner SD Public
Report via social media.
0845 PM Hail Davis 43.26N 97.00W
05/31/2026 E1.00 Inch Turner SD Emergency Mngr
0854 PM Tornado 5 NE Centerville 43.17N 96.89W
05/31/2026 Lincoln SD Storm Chaser
Tornado observed from chaser live feed.
0928 PM Hail 6 NNW Vermillion 42.87N 96.95W
05/31/2026 E1.00 Inch Clay SD Public
Report and photo via social media.
1005 PM Hail 10 S Alcester 42.88N 96.64W
05/31/2026 E1.00 Inch Union SD Trained Spotter
Most hail was pea to nickel sized, but a few
were quarter sized. Looked like a wall cloud
was about 3 to 4 miles to the west.
1130 PM Hail Hinton 42.62N 96.29W
05/31/2026 E1.50 Inch Plymouth IA Public
Report from social media. Time estimated by
radar.
1133 PM Hail 2 NNW Sioux City 42.53N 96.41W
05/31/2026 E1.00 Inch Woodbury IA Public
Report via social media.
1137 PM Hail 3 N Sioux City 42.54N 96.40W
05/31/2026 E0.70 Inch Woodbury IA Public
Caller reported ongoing pea to dime sized
hail. Location estimated by radar.
1225 AM Tstm Wnd Dmg 4 SSE Bronson 42.36N 96.17W
06/01/2026 Woodbury IA Trained Spotter
Tree branches 3 to 4 inches in diameter were
broken down by strong winds. Heavy rain and
small hail also occurred with this storm.
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Additional Information
The Forecast
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| SPC Day 1 Categorical Outlook | SPC Day 2 Categorical Outlook | SPC Day 3 Categorical Outlook |
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