This alert expired on 11 July 2026 at 21:00 UTC. It is kept here as a record.
It is the 6th strongest of the 74 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 7 July 2026. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 11 at 2:54PM CDT until July 11 at 4:00PM CDT by NWS New Orleans LA
An estimated 749,911 people live within 50 km of this point.
Nearby, since 16 March 2026
- May 25, 2026 · score 43 · 3.1 km
- June 18, 2026 · score 72 · 4.8 km
- May 9, 2026 · score 48 · 5.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 48 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) | 48 / 100 |
| Our confidence | 80% |
| Coordinates | 30.2496, -89.7576 |
| Nearest City | Slidell (4 km) |
| Population Exposed | 749.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-11T19:54:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.c782b02b350c2f678beefe0e7fc96699 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Mississippi Sound; Lake Maurepas; Lake Pontchartrain |
| Headline | Special Marine Warning issued July 11 at 2:54PM CDT until July 11 at 4:00PM CDT by NWS New Orleans LA |
| Expires | 2026-07-11T16:00:00-05:00 |
| SenderName | NWS New Orleans LA |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.c782b02b350c2f678beefe0e7fc96699627cec9f.001.1","noaa_urn:oid:2.49.0.1.840.0.7016d87f2f61b57ed4b1197385e5ecc0af6f5668.001.1"] |
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 48/100, near Slidell (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.