Hail in Austin on Tuesday, May 4, 2021
The Storm Prediction Center logged 6 hail reports in Austin on Tuesday, May 4, 2021, between 6:47 am and 10:13 am CDT, in 3 of the metro's 5 counties. The largest was 1.75 inches at 4 SE Uhland (Caldwell County) at 7:25 am. NOAA radar flagged 305 hail signatures inside the metro that day: 77 rated a 100% chance of hail and 75 with a maximum expected size of 1 inch or more.
Where hail was reported
Reports came from 5 places in Bastrop, Caldwell and Hays counties, named as the National Weather Service described them.
- San Marcos 2 reports, up to 1.50 in
- Bastrop 1 report, up to 1.50 in
- Lockhart 1 report, up to 1.00 in
- Smithville 1 report, up to 1.25 in
- Uhland 1 report, up to 1.75 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 |
|---|---|---|---|---|
| 6:47 am | 1.00 | 2 ENE San Marcos | Hays | MPING REPORT. (EWX) |
| 6:52 am | 1.50 | 4 ENE San Marcos | Hays | TWITTER REPORT FROM NEAR SAN MARCOS AIRPORT. (EWX) |
| 7:25 am | 1.75 | 4 SE Uhland | Caldwell | (EWX) |
| 7:30 am | 1.50 | 5 SSW Bastrop | Bastrop | PUBLIC REPORT OF QUARTER TO PING PONG BALL SIZED HAIL. ONLY LASTED ABOUT 5 MINUTES. (EWX) |
| 7:55 am | 1.25 | 1 E Smithville | Bastrop | NEAR SMITHVILLE MIDDLE SCHOOL. (EWX) |
| 10:13 am | 1.00 | 1 SE Lockhart | Caldwell | (EWX) |
What NEXRAD radar recorded inside the metro
305 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; 77 were rated 100% and 4 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 |
|---|---|---|---|---|---|---|---|
| KGRK | 149 | 41 | 34 | 0 | 1.75 in | 6:10 am | 10:49 am |
| KEWX | 123 | 23 | 30 | 4 | 2.25 in | 6:09 am | 10:50 am |
| KHGX | 26 | 10 | 8 | 0 | 1.50 in | 6:54 am | 10:55 am |
| KDFX | 4 | 1 | 1 | 0 | 1.00 in | 6:22 am | 8:51 am |
| KCRP | 3 | 2 | 2 | 0 | 1.00 in | 9:34 am | 9:53 am |
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 May 4, 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 Austin when its coordinates fall inside one of the metro's 5 counties (Travis, Williamson, Hays, Bastrop and Caldwell 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.