Right now
The most recent data we hold from NOAA arrived 4 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 22 September 2026 at 04:45 UTC. It is kept here as a record.
It is the 16th strongest of the 21 detections recorded within 20 km of this point since 25 April 2026. The last comparable one was on 7 September 2026.
What the source measured
NOAA reported: Special Marine Warning issued September 21 at 10:40PM CDT until September 21 at 11:45PM CDT by NWS New Orleans LA
Urban PEI: 262,709 within a heuristic 50 km radius; not unique people.
Nearby, since 25 April 2026
- May 9, 2026 · score 43 · 0.5 km
- June 16, 2026 · score 43 · 7.3 km
- May 24, 2026 · score 43 · 12.4 km
How we know
2 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 | 0.86/1 |
| Coordinates | 30.0414, -88.8979 |
| Nearest City | Biloxi (40 km) |
| Urban exposure index (PEI) | 262.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-22T03:40:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.6a72959b1f1d9c555bfb6bae77c2e12669538a49.001.1 |
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: 2026-09-22T03:40:00.000Z.
First archived: 2026-09-22T04:36:10.959Z. 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 | Chandeleur Sound; Coastal waters from Pascagoula Mississippi to Stake Island out 20 NM |
| Headline | Special Marine Warning issued September 21 at 10:40PM CDT until September 21 at 11:45PM CDT by NWS New Orleans LA |
| Expires | 2026-09-21T23:45:00-05:00 |
| SenderName | NWS New Orleans LA |
| HasExactCoords | true |
| Iem TypeSummary | M |
| Iem Magnitude | 46 |
| Iem Unit | MPH |
| Iem City | 11 SSE Pascagoula |
| Iem County | GMZ532 |
| Iem State | MS |
| Iem Wfo | LIX |
| Iem Remark | Mesonet station PTBM6 Petit Bois Is (Port of Pascagoula MS). |
| MergedSources | [{"id":"iem_M_30.230_-88.980_1790047680000","source":"iem","severity":"low","severityValue":25,"timestamp":1790047680000,"latitude":30.23,"longitude":-88.98},{"id":"iem_M_30.210_-88.500_1790047080000","source":"iem","severity":"low","severityValue":25,"timestamp":1790047080000,"latitude":30.21,"longitude":-88.5}] |
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.
Want to know when something happens in this area?