Hail in Birmingham on Saturday, April 24, 2021
The Storm Prediction Center logged 7 hail reports in Birmingham on Saturday, April 24, 2021, between 4:44 pm and 5:30 pm CDT, in 3 of the metro's 5 counties. The largest was 2.00 inches at 2 WSW Caldwell (St. Clair County) at 5:15 pm. NOAA radar flagged 511 hail signatures inside the metro that day: 118 rated a 100% chance of hail and 157 with a maximum expected size of 1 inch or more.
Where hail was reported
Reports came from 7 places in Blount, Jefferson and St. Clair counties, named as the National Weather Service described them.
- Ashville 1 report, up to 1.00 in
- Caldwell 1 report, up to 2.00 in
- Gardendale 1 report, up to 1.00 in
- Hayden 1 report, up to 1.25 in
- Highland Lake 1 report, up to 1.25 in
- Warrior 1 report, up to 1.50 in
- Whitney Junction 1 report, up to 1.50 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 |
|---|---|---|---|---|
| 4:44 pm | 1.50 | Warrior | Jefferson | (BMX) |
| 4:47 pm | 1.25 | Hayden | Blount | (BMX) |
| 5:00 pm | 1.00 | 1 SSE Gardendale | Jefferson | 1 INCH HAIL MEASURED IN GARDENDALE. TIME ESTIMATED BY RADAR. (BMX) |
| 5:12 pm | 1.25 | 1 ESE Highland Lake | Blount | (BMX) |
| 5:13 pm | 1.50 | 3 W Whitney Junction | Blount | (BMX) |
| 5:15 pm | 2.00 | 2 WSW Caldwell | St. Clair | (BMX) |
| 5:30 pm | 1.00 | 4 ENE Ashville | St. Clair | QUARTER SIZE HAIL ON DAVIS DRIVE. (BMX) |
What NEXRAD radar recorded inside the metro
511 signatures from 6 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 24 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 |
|---|---|---|---|---|---|---|---|
| KGWX | 145 | 42 | 53 | 9 | 2.75 in | 3:38 pm | 6:10 pm |
| KHTX | 110 | 24 | 31 | 5 | 2.25 in | 3:40 pm | 6:10 pm |
| KBMX | 97 | 19 | 36 | 6 | 3.00 in | 3:44 pm | 6:10 pm |
| KMXX | 91 | 18 | 23 | 2 | 2.00 in | 3:42 pm | 6:10 pm |
| KFFC | 62 | 15 | 14 | 2 | 2.00 in | 3:55 pm | 6:08 pm |
| KEOX | 6 | 0 | 0 | 0 | 0.50 in | 5:46 pm | 6:05 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 24, 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 Birmingham when its coordinates fall inside one of the metro's 5 counties (Jefferson, Shelby, St. Clair, Blount and Walker 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.