Right now
The most recent data we hold from NOAA arrived 24 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 20 May 2026 at 05:45 UTC. It is kept here as a record.
It is the 7th strongest of the 32 detections recorded within 20 km of this point since 20 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: Severe Thunderstorm Warning issued May 20 at 12:21AM CDT until May 20 at 12:45AM CDT by NWS Austin/San Antonio TX
An estimated 16,476 people live within 50 km of this point.
Nearby, since 20 May 2026
- May 20, 2026 · score 34 · 17.4 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 34 out of 100, at 86 % 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) | 34 / 100 |
| Our confidence | 86% |
| Coordinates | 29.0720, -99.7330 |
| Nearest City | Uvalde (16 km) |
| Population Exposed | 16.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-20T05:21:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.ffc84d273ec3ce4bbd6fecbc85e501a4 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Zavala, TX; Uvalde, TX; Zavala, TX |
| Headline | Severe Thunderstorm Warning issued May 20 at 12:21AM CDT until May 20 at 12:45AM CDT by NWS Austin/San Antonio TX |
| Expires | 2026-05-20T00:45:00-05:00 |
| SenderName | NWS Austin/San Antonio TX |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ffc84d273ec3ce4bbd6fecbc85e501a41d33a489.001.1","noaa_urn:oid:2.49.0.1.840.0.74086903d26c8e1f6ee7113767fddfd41255da19.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 55 |
| Iem Unit | MPH |
| Iem City | 8 NNE D'Hanis |
| Iem County | Medina |
| Iem State | TX |
| Iem Wfo | EWX |
| Iem Remark | Parkers Recharge Dam. |
| MergedSources | [{"id":"iem_G_29.440_-99.250_1779250200000","source":"iem","severity":"low","severityValue":25,"timestamp":1779250200000,"latitude":29.44,"longitude":-99.25}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
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.
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