This alert expired on 23 May 2026 at 19:30 UTC. It is kept here as a record.
No stronger detection stands among the 19 recorded within 20 km of this point since 20 May 2026 — 10 others scored the same. The last comparable one was on 20 May 2026. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 23 at 1:42PM CDT until May 23 at 2:30PM CDT by NWS Houston/Galveston TX
An estimated 186,459 people live within 50 km of this point.
Nearby, since 20 May 2026
- May 20, 2026 · score 43 · 11.6 km
- May 27, 2026 · score 43 · 14.1 km
- July 23, 2026 · score 43 · 16.0 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 78 % 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 | 78% |
| Coordinates | 28.9990, -95.0828 |
| Nearest City | Lake Jackson (34 km) |
| Population Exposed | 186.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-23T18:42:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.a5354d3d7c4b6a52eec7a17a76257a0b |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Matagorda Bay; Coastal waters from Freeport to Matagorda Ship Channel TX out 20 NM; Waters from Freeport to Matagorda Ship Channel TX from 20 to 60 NM; Galveston Bay; Coastal waters from High Island to Freeport TX out 20 NM; Waters from High Island to Freeport TX from 20 to 60 NM; San Antonio, Mesquite, and Espiritu Santo Bays; Coastal waters from Port Aransas to Matagorda Ship Channel out 20 NM and 2 more areas |
| Headline | Special Marine Warning issued May 23 at 1:42PM CDT until May 23 at 2:30PM CDT by NWS Houston/Galveston TX |
| Expires | 2026-05-23T14:30:00-05:00 |
| SenderName | NWS Houston/Galveston TX |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a5354d3d7c4b6a52eec7a17a76257a0b8999c2c5.001.1","noaa_urn:oid:2.49.0.1.840.0.a351340563b1e2b259b6ee3d931fad904ebada92.001.1","noaa_urn:oid:2.49.0.1.840.0.fb449cd6f4b11f0ed616f0ff20700de328f488c3.001.1","noaa_urn:oid:2.49.0.1.840.0.f72d260a9cc8cb4d475ca0659a12c129120684d5.001.1","noaa_urn:oid:2.49.0.1.840.0.bd08d1fe83f673ab04def28e392cd255012632a7.001.1"] |
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.