Right now
The most recent data we hold from NOAA arrived 17 minutes ago, and this point is in it.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 22 September 2026 at 04:30 UTC. It is kept here as a record.
It is the 42nd strongest of the 48 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 10 September 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued September 21 at 10:54PM CDT until September 21 at 11:30PM CDT by NWS New Orleans LA
Urban PEI: 203,433 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- June 6, 2026 · score 43 · 7.2 km
- June 24, 2026 · score 43 · 7.6 km
- July 22, 2026 · score 43 · 11.6 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 37 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) | 37 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 30.1457, -89.5100 |
| Nearest City | Slidell (30 km) |
| Urban exposure index (PEI) | 203.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-22T03:54:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.8a9a0be9da96d317eeee87b6a571064190188711.001.1 |
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: 2026-09-22T03:54:00.000Z.
First archived: 2026-09-22T03:58:37.441Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-22T04:31:01.059Z · data_change
Index 37 → 37; severity medium → medium; version 5 → 5.
2026-09-22T04:25:37.089Z · data_change
Index 37 → 37; severity medium → medium; version 5 → 5.
2026-09-22T04:20:15.034Z · data_change
Index 37 → 37; severity medium → medium; version 5 → 5.
2026-09-22T04:14:54.062Z · data_change
Index 37 → 37; severity medium → medium; version 5 → 5.
2026-09-22T04:09:33.536Z · data_change
Index 37 → 37; severity medium → medium; version 5 → 5.
2026-09-22T04:04:11.851Z · data_change
Index 37 → 37; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Lake Pontchartrain; Chandeleur Sound; Coastal waters from Pascagoula Mississippi to Stake Island out 20 NM; Mississippi Sound |
| Headline | Special Marine Warning issued September 21 at 10:54PM CDT until September 21 at 11:30PM CDT by NWS New Orleans LA |
| Expires | 2026-09-21T23:30:00-05:00 |
| SenderName | NWS New Orleans LA |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8a9a0be9da96d317eeee87b6a571064190188711.001.1","noaa_urn:oid:2.49.0.1.840.0.6a72959b1f1d9c555bfb6bae77c2e12669538a49.001.1","noaa_urn:oid:2.49.0.1.840.0.cba185361723ae497cad5864a4315519b4d3960b.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 2 N Madisonville |
| Spc County | St. Tammany |
| Spc State | LA |
| Spc Comments | Corrects previous tstm wnd dmg report from 2 N Madisonville. Trees down. (LIX) |
| Iem TypeSummary | M |
| Iem Magnitude | 50 |
| Iem Unit | MPH |
| Iem City | 12 SSW Mandeville |
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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