Preliminary NWS reports for San Antonio on March 21, 2024 via the Storm Prediction Center. NCEI check for San Antonio on Mar 21, 2024: NCEI final record: confirmed (StormEvents_details-ftp_v1.0_d2024_c20260728.csv.gz, compiled July 28, 2026). The San Antonio record that holds Mar 21, 2024 last changed October 17, 2026.
The Day In Numbers
| Reports of 1 inch or larger | 7 |
|---|---|
| Counties reporting | 2: Bexar, Comal |
| Largest stone (inches) | 2.5 |
| Reports 1.75 inches or larger | 3 |
For San Antonio, the Storm Prediction Center date runs from 12:00 UTC on March 21, 2024 to 12:00 UTC the next day, soSan Antonio reports timed 00:00 to 11:59 UTC happened on the evening of March 21, 2024 in Texas. For San Antonio on Mar 21, 2024, stone size is the diameter in inches as reported to the National Weather Service.
Every Report
| Time (UTC) | Size (inches) | Location | County |
|---|---|---|---|
| 01:51 | 1.25 | 3 SE Helotes | Bexar |
| 01:53 | 1 | 3 NW Leon Valley | Bexar |
| 01:55 | 2 | 2 NW Leon Valley | Bexar |
| 01:57 | 2.5 | 2 SE Leon Valley | Bexar |
| 02:01 | 1.75 | 2 NNE Leon Valley | Bexar |
| 02:12 | 1 | 1 SE Olmos Park | Bexar |
| 02:18 | 1 | 6 NNE New Braunfels | Comal |
Largest Report On March 21, 2024
The largest stone reported on March 21, 2024 was 2.5 inches at 2 SE Leon Valley, Bexar County, timed 01:57 UTC.No other San Antonio report on Mar 21, 2024 matched 2.5 inches. The note the San Antonio area forecast office attached to it on March 21, 2024 reads: “Picture of Tennis Ball size hail near Silver Tip and White Tail in San Antonio; (EWX)”
Reports By County On Mar 21, 2024
| County | Reports | Largest (inches) | Sizes in report order (inches) |
|---|---|---|---|
| Bexar | 6 | 2.5 | 1.25, 1, 2, 2.5, 1.75, 1 |
| Comal | 1 | 1 | 1 |
The 7 reports on March 21, 2024 were spread over 2 counties, and Bexar County held the largest stone at 2.5 inches. Bexar County logged 6 reports with a largest stone of 2.5 inches on March 21, 2024. Comal County logged 1 report with a largest stone of 1 inch on March 21, 2024.
What The Reporters Wrote
- 01:51 UTC, 3 SE Helotes, Bexar County, 1.25 inches: Report from mPING: Half Dollar (1.25 in.); (EWX)
- 01:53 UTC, 3 NW Leon Valley, Bexar County, 1 inch: Report from mPING: Quarter (1.00 in.); (EWX)
- 01:55 UTC, 2 NW Leon Valley, Bexar County, 2 inches: Estimated 2 hail reported near Bandera and Guilbeau..; picture via social media; (EWX)
- 01:57 UTC, 2 SE Leon Valley, Bexar County, 2.5 inches: Picture of Tennis Ball size hail near Silver Tip and White Tail in San Antonio; (EWX)
- 02:01 UTC, 2 NNE Leon Valley, Bexar County, 1.75 inches: Measured hailstones near Huebner and Eckhert of near Golf Ball size..; Pictures sent via social media; (EWX)
- 02:12 UTC, 1 SE Olmos Park, Bexar County, 1 inch: Spotter reported 1 inch hail lasting about 30 seconds near Brackenridge Park; (EWX)
- 02:18 UTC, 6 NNE New Braunfels, Comal County, 1 inch: (EWX)
Other Hail Days Within 30 Days Of Mar 21, 2024
3 other days in the San Antonio record had hail of 1 inch or larger within 30 days of March 21, 2024. A San Antonio roof hit on March 21, 2024 and again on one of these dates can carry damage from both, which matters when a claim is filed for only one date.
- San Antonio, 11 days after Mar 21, 2024: April 1, 2024, 11 reports, largest 1.75 inches.
- San Antonio, 19 days after Mar 21, 2024: April 9, 2024, 9 reports, largest 1.5 inches.
- San Antonio, 30 days after Mar 21, 2024: April 20, 2024, 13 reports, largest 2 inches.
Re-Roof Permits In The 30 Days After Mar 21, 2024
The City of San Antonio permit file lists 408 re-roof permits issued from March 22, 2024 to April 20, 2024, the 30 days after March 21, 2024. For scale, the same file averages about 413 per 30 days from November 30, 2020 to September 25, 2026, so the Mar 21, 2024 window came in below that average. The 408 City of San Antonio permits counted after March 21, 2024 include every re-roof permit in that window, not only roofs hit by hail, and a permit shows work that was filed, not that hail caused it. Dataset for the City of San Antonio count after March 21, 2024: https://data.sanantonio.gov/dataset/building-permits, City of San Antonio, Development Services Department, loaded through September 25, 2026.
Reading A Preliminary Record Against The Final One
The reports above come from the Storm Prediction Center file for San Antonio on March 21, 2024, pulled October 17, 2026. The San Antonio file for Mar 21, 2024 is preliminary: forecast offices logged its 7 reports as they arrived, and a spotter, a broadcaster or a social media post can each be the source. The NCEI Storm Events record is the reviewed version, and for San Antonio on Mar 21, 2024 it is checked against a file that reaches May 26, 2026, 796 days later. For March 21, 2024 in San Antonio the NCEI record does list hail, so a reviewed entry exists for this date. Sizes and counts for San Antonio on Mar 21, 2024 can still differ between the two records, so use the NCEI entry when the two disagree.
If Your Roof Was Under This
Compare the San Antonio report locations for March 21, 2024 with your address, then get a documented inspection before you file anything. See the San Antonio hail history for how Mar 21, 2024 compares. For a San Antonio roof after March 21, 2024, the hail claim calculator shows whether a claim nets anything after your deductible. Before you sign anything in San Antonio after Mar 21, 2024, use the check-a-roofer guide. For a San Antonio roof hit on March 21, 2024, chapter 707 bars a Texas contractor from negotiating the claim for you. After Mar 21, 2024, see the San Antonio roofing company ranking and the company directory.
Previous storm day: January 23, 2024 | Next storm day: April 1, 2024 | All San Antonio storm days | Latest storm day: September 11, 2026
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Sources
- NOAA Storm Prediction Center, preliminary local storm reports for San Antonio on March 21, 2024, pulled October 17, 2026, preliminary and subject to review. https://www.spc.noaa.gov/climo/reports/240321_rpts.html.
- NOAA National Centers for Environmental Information, Storm Events Database bulk files, the record the San Antonio March 21, 2024 status line above checks (record reaches May 26, 2026, pulled October 17, 2026, reviewed record). https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/.
- City of San Antonio, Development Services Department, re-roof permit file, loaded through September 25, 2026, used for the 408 permits counted after March 21, 2024. https://data.sanantonio.gov/dataset/building-permits.