This alert expired on 21 July 2026 at 00:45 UTC. It is kept here as a record.
It is the 6th strongest of the 15 detections recorded within 20 km of this point since 17 June 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 20 at 6:42PM CDT until July 20 at 7:45PM CDT by NWS New Orleans LA
An estimated 53,642 people live within 50 km of this point.
Nearby, since 17 June 2026
- July 11, 2026 · score 39 · 6.1 km
- July 21, 2026 · score 32 · 14.7 km
- September 1, 2026 · score 16 · 15.6 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 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) | 32 / 100 |
| Our confidence | 80% |
| Coordinates | 29.1841, -90.8462 |
| Nearest City | Houma (48 km) |
| Population Exposed | 53.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-20T23:42:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.eee5b9aab46b06c5b51734877f78d30a |
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; Coastal waters from Port Fourchon Louisiana to Lower Atchafalaya River LA from 20 to 60 NM |
| Headline | Special Marine Warning issued July 20 at 6:42PM CDT until July 20 at 7:45PM CDT by NWS New Orleans LA |
| Expires | 2026-07-20T19:45:00-05:00 |
| SenderName | NWS New Orleans LA |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.eee5b9aab46b06c5b51734877f78d30a983cf31a.001.1","noaa_urn:oid:2.49.0.1.840.0.09f968a7e433934777e7b69d6e9f558543c21fd7.001.1"] |
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 32/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.