Hail in St. Louis on Friday, April 17, 2026
The Storm Prediction Center logged 14 hail reports in St. Louis on Friday, April 17, 2026, between 3:15 pm and 4:15 pm CDT, in 2 of the metro's 12 counties. The largest was 1.00 inches at 3 NE Saint Charles (St. Charles, MO) at 4:15 pm. NOAA radar flagged 137 hail signatures inside the metro that day: 20 rated a 100% chance of hail and 36 with a maximum expected size of 1 inch or more.
Where hail was reported
Reports came from 6 places in St. Charles, MO and St. Louis, MO, named as the National Weather Service described them.
- Harvester 6 reports, up to 1.00 in
- Saint Charles 3 reports, up to 1.00 in
- Defiance 2 reports, up to 1.00 in
- Chesterfield 1 report, up to 1.00 in
- Cottleville 1 report, up to 1.00 in
- Weldon Spring 1 report, up to 1.00 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 |
|---|---|---|---|---|
| 3:15 pm | 1.00 | 3 NE Defiance | St. Charles, MO | Report from mPING: Quarter (1.00 in.). (LSX) |
| 3:25 pm | 1.00 | 3 NE Defiance | St. Charles, MO | Corrects previous hail report from 3 NE Defiance. Report from mPING: Quarter (1.00 in.). (LSX) |
| 3:35 pm | 1.00 | 3 WNW Chesterfield | St. Louis, MO | (LSX) |
| 3:39 pm | 1.00 | 2 W Harvester | St. Charles, MO | Report from mPING: Quarter (1.00 in.). (LSX) |
| 3:40 pm | 1.00 | 2 ENE Weldon Spring | St. Charles, MO | (LSX) |
| 3:42 pm | 1.00 | 2 SSW Harvester | St. Charles, MO | (LSX) |
| 3:45 pm | 1.00 | 2 SE Harvester | St. Charles, MO | Report from social media... largest hail stone around 1 inch. (LSX) |
| 3:45 pm | 1.00 | Harvester | St. Charles, MO | Report from mPING: Quarter (1.00 in.). (LSX) |
| 3:46 pm | 1.00 | 2 S Harvester | St. Charles, MO | Report from mPING: Quarter (1.00 in.). (LSX) |
| 3:48 pm | 1.00 | Cottleville | St. Charles, MO | (LSX) |
| 3:49 pm | 1.00 | 1 NE Harvester | St. Charles, MO | Report from mPING: Quarter (1.00 in.). (LSX) |
| 4:05 pm | 1.00 | 2 SW Saint Charles | St. Charles, MO | Report from mPING: Quarter (1.00 in.). (LSX) |
| 4:08 pm | 1.00 | 3 NNE Saint Charles | St. Charles, MO | (LSX) |
| 4:15 pm | 1.00 | 3 NE Saint Charles | St. Charles, MO | Report from mPING: Quarter (1.00 in.). (LSX) |
What NEXRAD radar recorded inside the metro
137 signatures from 4 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; 20 were rated 100% and 1 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 |
|---|---|---|---|---|---|---|---|
| KILX | 75 | 17 | 24 | 1 | 2.00 in | 2:55 pm | 10:38 pm |
| KLSX | 54 | 3 | 12 | 0 | 1.75 in | 2:10 pm | 10:38 pm |
| KSGF | 4 | 0 | 0 | 0 | 0.75 in | 2:13 pm | 2:26 pm |
| KPAH | 4 | 0 | 0 | 0 | 0.50 in | 2:50 pm | 10:12 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 April 17, 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 (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.