Hail in Rapid City on Tuesday, August 18, 2026
The Storm Prediction Center logged 6 hail reports in Rapid City on Tuesday, August 18, 2026, between 7:59 pm and 8:08 pm MDT, in 1 of the metro's 2 counties. The largest was 1.50 inches at 5 SSW Dwtn Rapid City (Pennington County) at 8:06 pm. NOAA radar flagged no hail signature inside the metro that day.
Where hail was reported
Reports came from 2 places in Pennington County, named as the National Weather Service described them.
- Dwtn Rapid City 5 reports, up to 1.50 in
- Rockerville 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 |
|---|---|---|---|---|
| 7:59 pm | 1.50 | 4 WSW Dwtn Rapid City | Pennington | Time estimated via radar. (UNR) |
| 8:01 pm | 1.50 | 5 SW Dwtn Rapid City | Pennington | Report sent to media livestream then relayed via Slack (UNR) |
| 8:02 pm | 1.00 | 4 SSW Dwtn Rapid City | Pennington | Report sent to media livestream then relayed via Slack. (UNR) |
| 8:03 pm | 1.00 | 5 NE Rockerville | Pennington | Report sent to media livestream then relayed via Slack. (UNR) |
| 8:06 pm | 1.50 | 5 SSW Dwtn Rapid City | Pennington | Report sent to media livestream then relayed via Slack. (UNR) |
| 8:08 pm | 1.25 | 4 S Dwtn Rapid City | Pennington | (UNR) |
What NEXRAD radar recorded inside the metro
NOAA's radar hail algorithm flagged no hail signature inside the metro's counties on this local date, although spotters reported hail. That can happen when storms are small or far from the nearest radar.
Check an address for August 18, 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.