This alert expired on 21 June 2026 at 13:30 UTC. It is kept here as a record.
It is the 4th strongest of the 10 detections recorded within 20 km of this point since 20 May 2026. The last comparable one was on 20 June 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 21 at 6:55AM CDT until June 21 at 8:30AM CDT by NWS Houston/Galveston TX
An estimated 109,420 people live within 50 km of this point.
Nearby, since 20 May 2026
- August 28, 2026 · score 48 · 9.8 km
- June 20, 2026 · score 48 · 17.9 km
- May 20, 2026 · score 39 · 18.8 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 80 % 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 | 80% |
| Coordinates | 29.1455, -95.5269 |
| Nearest City | Angleton (10 km) |
| Population Exposed | 109.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-21T11:55:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.380b1f9dd9dd44f1c6963842885fa986 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Galveston Bay; 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 Freeport to Matagorda Ship Channel TX from 20 to 60 NM |
| Headline | Special Marine Warning issued June 21 at 6:55AM CDT until June 21 at 8:30AM CDT by NWS Houston/Galveston TX |
| Expires | 2026-06-21T08:30:00-05:00 |
| SenderName | NWS Houston/Galveston TX |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.380b1f9dd9dd44f1c6963842885fa986b6c91428.001.1","noaa_urn:oid:2.49.0.1.840.0.29859bb1fb8bc9d35ac112722c812b14f0073677.001.1"] |
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, near Angleton (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.