Hail in Rapid City on Saturday, August 12, 2023
The Storm Prediction Center logged 6 hail reports in Rapid City on Saturday, August 12, 2023, between 2:20 pm and 8:32 pm MDT, in 1 of the metro's 2 counties. The largest was 2.00 inches at Sheridan Lake (Pennington County) at 3:00 pm. NOAA radar flagged 190 hail signatures inside the metro that day: 68 rated a 100% chance of hail and 65 with a maximum expected size of 1 inch or more.
Where hail was reported
Reports came from 4 places in Pennington County, named as the National Weather Service described them.
- Sheridan Lake 2 reports, up to 2.00 in
- Silver City 2 reports, up to 1.50 in
- Keystone 1 report, up to 1.00 in
- N Rockerville 1 report, up to 1.75 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 |
|---|---|---|---|---|
| 2:20 pm | 1.00 | 2 NE Silver City | Pennington | Mostly pea size hail with a few quarters. (UNR) |
| 2:20 pm | 1.50 | 2 NNE Silver City | Pennington | (UNR) |
| 3:00 pm | 2.00 | Sheridan Lake | Pennington | (UNR) |
| 3:10 pm | 1.75 | N Rockerville | Pennington | (UNR) |
| 3:17 pm | 1.00 | 3 N Sheridan Lake | Pennington | mPING report (UNR) |
| 8:32 pm | 1.00 | Keystone | Pennington | mPING report (UNR) |
What NEXRAD radar recorded inside the metro
190 signatures from 3 radars 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; 68 were rated 100% and 26 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 | 185 | 67 | 65 | 26 | 4.00 in | 1:44 pm | 9:15 pm |
| KBIS | 3 | 0 | 0 | 0 | 0.50 in | 6:31 pm | 6:41 pm |
| KLNX | 2 | 1 | 0 | 0 | 0.50 in | 6:16 pm | 6:22 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 12, 2023
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.