This alert expired on 21 July 2026 at 19:00 UTC. It is kept here as a record.
It is the 7th strongest of the 11 detections recorded within 20 km of this point since 23 May 2026. The last comparable one was on 20 July 2026. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 21 at 1:00PM CDT until July 21 at 2:00PM CDT by NWS New Orleans LA
An estimated 53,642 people live within 50 km of this point.
Nearby, since 23 May 2026
- July 11, 2026 · score 39 · 8.6 km
- July 14, 2026 · score 39 · 13.4 km
- July 20, 2026 · score 32 · 14.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 32 out of 100, at 79 % 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) | 32 / 100 |
| Our confidence | 79% |
| Coordinates | 29.1900, -90.6950 |
| Nearest City | Houma (46 km) |
| Population Exposed | 53.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T18:00:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.1ab05c7d3851ee984657d99a1aa6ccdfd35f953f.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Terrebonne Bay; Coastal Waters from Port Fourchon LA to Lower Atchafalaya River LA out 20 nm |
| Headline | Special Marine Warning issued July 21 at 1:00PM CDT until July 21 at 2:00PM CDT by NWS New Orleans LA |
| Expires | 2026-07-21T14:00:00-05:00 |
| SenderName | NWS New Orleans LA |
| 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 32/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.