Hail in St. Louis on Monday, July 17, 2023
The Storm Prediction Center logged 19 hail reports in St. Louis on Monday, July 17, 2023, between 4:31 am and 3:36 pm CDT, in 4 of the metro's 12 counties. The largest was 2.50 inches at 2 SE Centreville (St. Clair, IL) at 3:29 pm. NOAA radar flagged 1,018 hail signatures inside the metro that day: 361 rated a 100% chance of hail and 285 with a maximum expected size of 1 inch or more.
Where hail was reported
Reports came from 9 places in Franklin, MO, Madison, IL, St. Clair, IL and St. Louis, MO, named as the National Weather Service described them.
- Belleville 5 reports, up to 2.00 in
- Florissant 4 reports, up to 2.00 in
- Centreville 2 reports, up to 2.50 in
- Gerald 2 reports, up to 1.00 in
- Madison 2 reports, up to 1.25 in
- Caseyville 1 report, up to 1.00 in
- Godfrey 1 report, up to 1.00 in
- Granite City 1 report, up to 1.00 in
- Spanish Lake 1 report, up to 1.25 in
Every hail report logged that day
Times are Central 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 |
|---|---|---|---|---|
| 4:31 am | 1.00 | Gerald | Franklin, MO | Time estimated from radar. (LSX) |
| 4:39 am | 1.00 | 2 SSE Gerald | Franklin, MO | Report from mPING: Quarter (1.00 in.). (LSX) |
| 2:35 pm | 1.25 | 4 N Florissant | St. Louis, MO | (LSX) |
| 2:38 pm | 1.00 | Godfrey | Madison, IL | Mix of pea... dime... and quarter sized hail. (LSX) |
| 2:40 pm | 1.00 | 3 NNE Florissant | St. Louis, MO | Report from mPING: Quarter (1.00 in.). (LSX) |
| 2:44 pm | 1.25 | 1 WNW Spanish Lake | St. Louis, MO | At intersection of Highway 367 and Parker Road. Via picture on Facebook. (LSX) |
| 2:44 pm | 2.00 | 1 NE Florissant | St. Louis, MO | via Twitter... time estimated from radar. (LSX) |
| 2:45 pm | 1.00 | 2 NE Florissant | St. Louis, MO | (LSX) |
| 3:12 pm | 1.25 | Madison | Madison, IL | (LSX) |
| 3:12 pm | 1.25 | 1 N Madison | Madison, IL | Report from mPING: Half Dollar (1.25 in.). (LSX) |
| 3:20 pm | 1.00 | 1 ENE Granite City | Madison, IL | (LSX) |
| 3:26 pm | 1.25 | 2 WNW Belleville | St. Clair, IL | (LSX) |
| 3:28 pm | 1.00 | Caseyville | St. Clair, IL | (LSX) |
| 3:29 pm | 2.50 | 2 SE Centreville | St. Clair, IL | Hail up to tennis ball size. Also... several cars with windows broken in the area where the hail fell. (LSX) |
| 3:29 pm | 1.75 | 1 SE Centreville | St. Clair, IL | By Lady of the Snows Shrine on Highway 15. (LSX) |
| 3:32 pm | 2.00 | 2 W Belleville | St. Clair, IL | Hail lasted for 12 minutes. (LSX) |
| 3:33 pm | 2.00 | 3 NW Belleville | St. Clair, IL | (LSX) |
| 3:36 pm | 1.00 | 1 WSW Belleville | St. Clair, IL | (LSX) |
| 3:36 pm | 1.00 | 2 NW Belleville | St. Clair, IL | Reported at Memorial Hospital. (LSX) |
What NEXRAD radar recorded inside the metro
1,018 signatures from 5 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; 361 were rated 100% and 47 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 |
|---|---|---|---|---|---|---|---|
| KLSX | 312 | 123 | 105 | 19 | 4.00 in | 12:03 am | 7:06 pm |
| KILX | 274 | 82 | 65 | 12 | 3.75 in | 12:21 am | 3:40 pm |
| KPAH | 246 | 82 | 53 | 7 | 3.75 in | 12:25 am | 7:06 pm |
| KVWX | 149 | 50 | 36 | 8 | 4.00 in | 12:51 am | 7:09 pm |
| KSGF | 37 | 24 | 26 | 1 | 2.00 in | 12:23 am | 5:26 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 July 17, 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 (Central Daylight Time) and by county: a report counts for St. Louis when its coordinates fall inside one of the metro's 12 counties (the counties of St. Louis, MO, St. Louis City, MO, St. Charles, MO, Jefferson, MO, Franklin, MO, Lincoln, MO, Warren, MO, Madison, IL, St. Clair, IL, Monroe, IL, Jersey, IL and Clinton, IL). 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.