Hail in Rapid City on Tuesday, August 11, 2026
The Storm Prediction Center logged 21 hail reports in Rapid City on Tuesday, August 11, 2026, between 2:29 pm and 5:45 pm MDT, in 2 of the metro's 2 counties. The largest was 3.00 inches at 4 WNW Hermosa (Pennington County) at 3:19 pm. NOAA radar flagged 179 hail signatures inside the metro that day: 90 rated a 100% chance of hail and 100 with a maximum expected size of 1 inch or more.
Where hail was reported
Reports came from 7 places in Meade and Pennington counties, named as the National Weather Service described them.
- Rockerville 7 reports, up to 3.00 in
- Johnson Siding 5 reports, up to 2.50 in
- Hermosa 3 reports, up to 3.00 in
- Black Hawk 2 reports, up to 1.50 in
- Hayward 2 reports, up to 3.00 in
- Hill City 1 report, up to 1.00 in
- Nemo 1 report, up to 1.00 in
Every hail report logged that day
Times are Mountain Daylight Time. Sizes are in inches, as reported. The comment is the National Weather Service's text as published in the Storm Prediction Center's daily log.
| Time | Size | Place | County | NWS comment |
|---|---|---|---|---|
| 2:29 pm | 1.00 | 2 W Black Hawk | Meade | (UNR) |
| 2:30 pm | 2.50 | 3 NNW Johnson Siding | Pennington | Along Bogus Jim Rd. Photo via social media. Time estimated based on radar. (UNR) |
| 2:30 pm | 2.00 | 4 NNE Johnson Siding | Pennington | Hail ranged from pea size to 2 inches in diameter. Dented vehicles and shredded leaves reported. (UNR) |
| 2:31 pm | 1.75 | 3 NNE Johnson Siding | Pennington | Near the intersection of Nemo Rd and Norris Peak Rd. Photo via social media. Time estimated based on radar. (UNR) |
| 2:31 pm | 1.75 | 4 N Johnson Siding | Pennington | (UNR) |
| 2:32 pm | 1.75 | 4 ENE Johnson Siding | Pennington | Miller Flats area. Photo via social media. Time estimated based on radar. (UNR) |
| 2:34 pm | 1.50 | 2 W Black Hawk | Meade | (UNR) |
| 2:55 pm | 2.50 | Rockerville | Pennington | (UNR) |
| 2:55 pm | 1.25 | 2 NE Rockerville | Pennington | Behind Old MacDonalds Farm. Hail lightly covered the ground. Photo via social media. Time estimated based on radar. (UNR) |
| 2:59 pm | 2.00 | Rockerville | Pennington | Numerous broken windshields reported. Hail covered the ground and roads. Photo and report via social media. Time estimated based on radar. (UNR) |
| 2:59 pm | 1.75 | 3 ENE Rockerville | Pennington | At Bear Country USA. Hail covered the ground. Time estimated based on radar. (UNR) |
| 3:02 pm | 2.50 | 1 S Rockerville | Pennington | Photo via social media. Time estimated based on radar. (UNR) |
| 3:03 pm | 2.00 | 2 SSE Rockerville | Pennington | Relayed via NWS Cheyenne. Time estimated based on radar. (UNR) |
| 3:10 pm | 3.00 | 3 ESE Rockerville | Pennington | Along Hart Ranch Rd W. Photo received via social media. Time estimated based on radar. (UNR) |
| 3:15 pm | 2.75 | 1 E Hayward | Pennington | Time estimated based on radar. (UNR) |
| 3:15 pm | 3.00 | 1 NNE Hayward | Pennington | Reported on Rushmore Ranch Rd. Photo via social media. Time estimated based on radar. (UNR) |
| 3:18 pm | 2.75 | 5 WNW Hermosa | Pennington | Updated. Hail lasted for 10-15 minutes. 3 skylights were broken. (UNR) |
| 3:19 pm | 3.00 | 4 WNW Hermosa | Pennington | Along Highway 40. Photo via social media. Time estimated based on radar. (UNR) |
| 3:26 pm | 2.75 | 5 WNW Hermosa | Pennington | Hail lasted for 10-15 minutes (UNR) |
| 5:20 pm | 1.00 | 6 SW Nemo | Pennington | 1 mile west of Merritt. Photo via social media. Time estimated based on report and radar. (UNR) |
| 5:45 pm | 1.00 | 3 WNW Hill City | Pennington | (UNR) |
What NEXRAD radar recorded inside the metro
179 signatures from 1 radar fell inside the metro's counties on this local date, counting every cell the algorithm rated from a 10% to a 100% chance of hail; 90 were rated 100% and 48 had a maximum expected size of 2 inches or more.
| Radar | Signatures | Rated 100% | 1 in or more | 2 in or more | Largest expected | First | Last |
|---|---|---|---|---|---|---|---|
| KUDX | 179 | 90 | 100 | 48 | 4.00 in | 1:22 am | 9:40 pm |
Each radar that scans a storm writes its own signature about every 4 to 6 minutes, so one storm produces many rows and overlapping radars count it more than once. The raw rows for this day are in NOAA's Severe Weather Data Inventory.
Check an address for August 11, 2026
See, free, how many hail signatures NOAA recorded within 1, 3 and 5 miles of one address that day and the nearest spotter report. The full report is $19.
Spotter reports come from the Storm Prediction Center's preliminary daily logs, grouped here by local calendar date (Mountain Daylight Time) and by county: a report counts for Rapid City when its coordinates fall inside one of the metro's 2 counties (Pennington and Meade counties). Radar signatures are estimates from the Hail Detection Algorithm, not measured stones; they include every cell it rated, from a 10% to a 100% probability of hail. How these pages are built.