Right now
The most recent data we hold from NOAA arrived 4 minutes ago, and this point is in it.
4 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
This alert expired on 22 September 2026 at 00:00 UTC. It is kept here as a record.
It is the 49th strongest of the 103 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued September 21 at 6:50PM CDT until September 21 at 7:00PM CDT by NWS New Orleans LA
Urban PEI: 888,930 within a heuristic 50 km radius; not unique people.
Nearby, since 12 March 2026
- June 19, 2026 · score 48 · 1.5 km
- September 10, 2026 · score 41 · 5.8 km
- September 22, 2026 · score 41 · 9.4 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 41 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
Computed under scoring rules v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 41 / 100 |
| Legacy data-support index | 0.85/1 |
| Coordinates | 30.1645, -90.2873 |
| Nearest City | Kenner (20 km) |
| Urban exposure index (PEI) | 888.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-21T23:50:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.739c44d0220d04ef59c9670610ce99160b0eaeb8.001.1 |
Physical priority index · v5. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-09-21T23:50:00.000Z.
First archived: 2026-09-21T23:57:55.400Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Lake Pontchartrain |
| Headline | Special Marine Warning issued September 21 at 6:50PM CDT until September 21 at 7:00PM CDT by NWS New Orleans LA |
| Expires | 2026-09-21T19:00:00-05:00 |
| SenderName | NWS New Orleans LA |
| HasExactCoords | true |
| Iem TypeSummary | D |
| Iem City | 4 NW Enon |
| Iem County | Washington |
| Iem State | LA |
| Iem Wfo | LIX |
| Iem Remark | Trees down across Burnsfield Road. |
| MergedSources | [{"id":"iem_D_30.430_-90.160_1790033220000","source":"iem","severity":"low","severityValue":25,"timestamp":1790033220000,"latitude":30.43,"longitude":-90.16},{"id":"iem_D_30.770_-90.130_1790029200000","source":"iem","severity":"low","severityValue":25,"timestamp":1790029200000,"latitude":30.77,"longitude":-90.13}] |
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 8 March 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.
Review the area, threshold and delivery channel in your account.
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