This alert expired on 27 May 2026 at 04:00 UTC. It is kept here as a record.
It is the 2nd strongest of the 10 detections recorded within 20 km of this point since 1 May 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued May 26 at 7:55PM CDT until May 26 at 11:00PM CDT by NWS Austin/San Antonio TX
Nearby, since 1 May 2026
- June 22, 2026 · score 22 · 11.3 km
- June 21, 2026 · score 22 · 11.3 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 65 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 22 / 100 |
| Our confidence | 65% |
| Coordinates | 28.7880, -98.6500 |
| Nearest City | San Antonio (72 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-27T00:55:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.45ede10e40d2c951cb824b38d300cbcfce31af1a.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Atascosa, TX |
| Headline | Flash Flood Warning issued May 26 at 7:55PM CDT until May 26 at 11:00PM CDT by NWS Austin/San Antonio TX |
| Expires | 2026-05-26T23:00:00-05:00 |
| SenderName | NWS Austin/San Antonio TX |
| HasExactCoords | true |
| Google News RssFeed | weather |
| Google News SourceName | San Antonio Express-News |
| MergedSources | [{"id":"gnews_weather_494395_175","source":"google_news","severity":"medium","severityValue":40,"timestamp":1779823662000,"latitude":29.42,"longitude":-98.49}] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.