Hail in St. Louis on Saturday, March 27, 2021
The Storm Prediction Center logged 12 hail reports in St. Louis on Saturday, March 27, 2021, between 5:05 pm and 7:00 pm CDT, in 3 of the metro's 12 counties. The largest was 1.75 inches at 2 WSW Weldon Spring (St. Charles, MO) at 5:05 pm. NOAA radar flagged 514 hail signatures inside the metro that day: 118 rated a 100% chance of hail and 93 with a maximum expected size of 1 inch or more.
Where hail was reported
Reports came from 8 places in Madison, IL, St. Charles, MO and St. Louis, MO, named as the National Weather Service described them.
- Weldon Spring 4 reports, up to 1.75 in
- Maryland Heights 2 reports, up to 1.00 in
- Collinsville 1 report, up to 1.00 in
- Florissant 1 report, up to 1.00 in
- Harvester 1 report, up to 1.00 in
- Hazelwood 1 report, up to 1.00 in
- Maryville 1 report, up to 1.00 in
- Spanish Lake 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 |
|---|---|---|---|---|
| 5:05 pm | 1.75 | 2 WSW Weldon Spring | St. Charles, MO | 1.75 INCH HAIL AT THE NWS OFFICE IN WELDON SPRING. (LSX) |
| 5:07 pm | 1.00 | Weldon Spring | St. Charles, MO | VIA FACEBOOK WITH MEASUREMENTS. HAIL OF VARIABLE SIZE BUT 1IN MAX. (LSX) |
| 5:09 pm | 1.00 | 3 SSW Weldon Spring | St. Louis, MO | (LSX) |
| 5:11 pm | 1.00 | 3 S Weldon Spring | St. Louis, MO | REPORT FROM MPING: QUARTER (1.00 IN.). (LSX) |
| 5:13 pm | 1.00 | 2 E Harvester | St. Charles, MO | REPORT FROM MPING: QUARTER (1.00 IN.). (LSX) |
| 5:17 pm | 1.00 | 2 NW Maryland Heights | St. Charles, MO | REPORT FROM MPING: QUARTER (1.00 IN.). (LSX) |
| 5:21 pm | 1.00 | 1 ENE Maryland Heights | St. Louis, MO | REPORT FROM MPING: QUARTER (1.00 IN.). (LSX) |
| 5:27 pm | 1.00 | Hazelwood | St. Louis, MO | CORRECTS PREVIOUS HAIL REPORT FROM HAZELWOOD. (LSX) |
| 5:29 pm | 1.00 | Florissant | St. Louis, MO | VIA FACEBOOK REPORT WITH PICTURE. (LSX) |
| 5:35 pm | 1.00 | 1 WNW Spanish Lake | St. Louis, MO | (LSX) |
| 6:55 pm | 1.00 | Collinsville | Madison, IL | (LSX) |
| 7:00 pm | 1.00 | Maryville | Madison, IL | (LSX) |
What NEXRAD radar recorded inside the metro
514 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; 118 were rated 100% and 0 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 |
|---|---|---|---|---|---|---|---|
| KSTL | 252 | 47 | 29 | 0 | 1.50 in | 4:05 pm | 8:07 pm |
| KLSX | 154 | 26 | 26 | 0 | 1.75 in | 3:51 pm | 8:20 pm |
| KVWX | 55 | 27 | 24 | 0 | 1.50 in | 5:30 pm | 8:15 pm |
| KPAH | 51 | 18 | 14 | 0 | 1.25 in | 5:34 pm | 8:15 pm |
| KSGF | 2 | 0 | 0 | 0 | 0.50 in | 5:55 pm | 6:46 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 March 27, 2021
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.