South Dakota hail map — August 18, 2026
NOAA radar detected hail of an inch or more over 1 South Dakota city on August 18, 2026. The largest stones — 1.50″, half dollar size — fell over Rapid City.
- Cities hit
- 1
- in South Dakota
- Largest stone
- 1.50″
- half dollar size
- Impact rating
- 5/10
- 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 18, 2026
What people on the ground measured in South Dakota on August 18, 2026
8 reports filed with the National Weather Service — 3 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.
- 1.50″ half dollar size Trained Spotter4 WSW Dwtn Rapid City, SD8:59 PM CDTPennington County
Time estimated via radar.
- 1.50″ half dollar size Public5 SW Dwtn Rapid City, SD9:01 PM CDTPennington County
Report sent to media livestream then relayed via Slack
- 1.50″ half dollar size Public5 SSW Dwtn Rapid City, SD9:06 PM CDTPennington County
Report sent to media livestream then relayed via Slack.
- 1.25″ half dollar size Trained Spotter1 NNE Brownsville, SD8:11 PM CDTLawrence County
Mixed hail sizes up to half-dollar size.
- 1.25″ half dollar size NWS Employee4 S Dwtn Rapid City, SD9:08 PM CDTPennington County
- 1.00″ quarter size Public4 SSW Dwtn Rapid City, SD9:02 PM CDTPennington County
Report sent to media livestream then relayed via Slack.
- 1.00″ quarter size Public5 NE Rockerville, SD9:03 PM CDTPennington County
Report sent to media livestream then relayed via Slack.
- 0.70″ penny size Public1 NNE Brownsville, SD7:59 PM CDTLawrence County
Video sumbitted via social media of around 1 inch deep hail accumulation on HWY 385. Time estimated from radar.
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 18, 2026
The full US hail map for August 18, 2026 →Other South Dakota hail days
South Dakota hail on August 18, 2026
NOAA radar put hail of an inch or more over 1 South Dakota city that day. The largest stones — 1.50 inches, half dollar size — were over Rapid City. Every city hit is listed above with its own stone size.