Right now
The most recent data we hold from NOAA arrived 4 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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