South Dakota hail map — August 21, 2025
NOAA radar detected hail of an inch or more over 1 South Dakota city on August 21, 2025. The largest stones — 1.00″, quarter size — fell over Watertown.
- Cities hit
- 1
- in South Dakota
- Largest stone
- 1.00″
- quarter size
- Impact rating
- 3/10
- from stone size
Sizes come from NOAA MRMS radar (MESH), which runs about ±0.25″ against ground truth. It is canvass-targeting quality, not claim evidence.
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South Dakota cities hit on August 21, 2025
What people on the ground measured in South Dakota on August 21, 2025
4 reports filed with the National Weather Service — 1 from trained spotters or officials. These are measured stones, not radar estimates, so they are the closest thing to proof that hail actually reached the ground.
- 1.00″ quarter size Trained Spotter3 WNW Big Stone City, SD8:04 PM CDTGrant County
- 1.00″ quarter size PublicMilbank, SD8:38 PM CDTGrant County
Report from social media.
- 1.00″ quarter size Public6 NNW Carthage, SD12:22 AM CDTKingsbury County
- 0.75″ penny size PublicMilbank, SD8:33 PM CDTGrant County
Reports come from the National Weather Service Local Storm Report feed, ingested every 15 minutes. A report records where the observer was, not the full extent of the swath — treat it as evidence about the storm, not about any one roof.
Other states hit on August 21, 2025
The full US hail map for August 21, 2025 →Other South Dakota hail days
South Dakota hail on August 21, 2025
NOAA radar put hail of an inch or more over 1 South Dakota city that day. The largest stones — 1.00 inches, quarter size — were over Watertown. Every city hit is listed above with its own stone size.