Right now
The most recent data we hold from NOAA arrived 17 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
One other detection within 20 km in the last 24 hours, <1 km from here.
This alert expired on 18 September 2026 at 22:21 UTC. It is kept here as a record.
It is the 7th strongest of the 15 detections recorded within 20 km of this point since 5 July 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 18 at 6:11PM EDT until September 18 at 6:15PM EDT by NWS Key West FL
Urban PEI: 17,690 within a heuristic 50 km radius; not unique people.
Nearby, since 5 July 2026
- September 17, 2026 · score 28 · 1.0 km
- August 6, 2026 · score 32 · 11.7 km
- July 5, 2026 · score 34 · 12.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 28 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) | 28 / 100 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 25.6259, -81.8518 |
| Nearest City | Marco Island (37 km) |
| Urban exposure index (PEI) | 17.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-18T22:11:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.1550361e3b647ed3ce62d78aa18c705c54126169.001.1 |
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: 2026-09-18T22:11:00.000Z.
First archived: 2026-09-18T22:14:57.007Z. 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 | Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms; Bayside and Gulfside from Craig Key to West End of Seven Mile Bridge; Gulf of America from West End of Seven Mile Bridge to Halfmoon Shoal out to 5 Fathoms; Hawk Channel from Craig Key to west end of Seven Mile Bridge out to the reef; Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal out to the reef; Charlotte Harbor and Pine Island Sound; Coastal waters from Englewood to Tarpon Springs FL out 20 NM; Coastal waters from Bonita Beach to Englewood FL out 20 NM |
| Headline | Special Marine Warning issued September 18 at 6:11PM EDT until September 18 at 6:15PM EDT by NWS Key West FL |
| Expires | 2026-09-18T18:21:00-04:00 |
| SenderName | NWS Key West FL |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.1550361e3b647ed3ce62d78aa18c705c54126169.001.1","noaa_urn:oid:2.49.0.1.840.0.e553bf797bc40c610dbc67234b65962708da57a4.001.1","noaa_urn:oid:2.49.0.1.840.0.ed7bc62db5be2340c2dacff182da47d81e0e3226.001.1"] |
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 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.
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