This alert expired on 20 May 2026 at 06:15 UTC. It is kept here as a record.
No stronger detection stands among the 17 recorded within 20 km of this point since 20 May 2026 — 7 others scored the same.
What the source measured
NOAA reported: Special Marine Warning issued May 19 at 11:09PM CDT until May 20 at 1:15AM CDT by NWS Houston/Galveston TX
An estimated 206,354 people live within 50 km of this point.
Nearby, since 20 May 2026
- May 23, 2026 · score 43 · 11.6 km
- May 27, 2026 · score 43 · 12.7 km
- July 15, 2026 · score 43 · 14.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 81 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 81% |
| Coordinates | 29.0562, -94.9825 |
| Nearest City | Galveston (32 km) |
| Population Exposed | 206.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-20T04:09:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.27faf1fe83728d8c321c96fc60829d5ad3869f4a.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Matagorda Bay; Galveston Bay; Coastal waters from Freeport to Matagorda Ship Channel TX out 20 NM; Coastal waters from High Island to Freeport TX out 20 NM; Waters from High Island to Freeport TX from 20 to 60 NM |
| Headline | Special Marine Warning issued May 19 at 11:09PM CDT until May 20 at 1:15AM CDT by NWS Houston/Galveston TX |
| Expires | 2026-05-20T01:15:00-05:00 |
| SenderName | NWS Houston/Galveston TX |
| HasExactCoords | true |
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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 43/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.