This alert expired on 17 March 2026 at 04:45 UTC. It is kept here as a record.
It is the 2nd strongest of the 13 detections recorded within 20 km of this point since 17 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 March 17 at 12:33AM EDT until March 17 at 12:45AM EDT by NWS Key West FL
An estimated 80,737 people live within 50 km of this point.
Nearby, since 17 March 2026
- July 11, 2026 · score 43 · 12.8 km
- June 10, 2026 · score 22 · 19.6 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 39 out of 100, at 88 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 39 / 100 |
| Our confidence | 88% |
| Coordinates | 25.0916, -80.6622 |
| Nearest City | Homestead (46 km) |
| Population Exposed | 80.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-17T04:33:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.011de3532140c03a364ac23b231fa264 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Hawk Channel from Ocean Reef to Craig Key out to the reef; Straits of Florida from Ocean Reef to Craig Key out 20 NM; Coastal waters from Deerfield Beach to Ocean Reef FL out 20 NM; Waters from Jupiter Inlet to Deerfield Beach FL from 20 to 60 NM; Waters from Deerfield Beach to Ocean Reef FL from 20 to 60 NM excluding the territorial waters of Bahamas; 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; Straits of Florida from Craig Key to west end of Seven Mile Bridge out 20 NM; Straits of Florida from west end of Seven Mile Bridge to south of Halfmoon Shoal out 20 NM and 1 more areas |
| Headline | Special Marine Warning issued March 17 at 12:33AM EDT until March 17 at 12:45AM EDT by NWS Key West FL |
| Expires | 2026-03-17T00:45:00-04:00 |
| SenderName | NWS Key West FL |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.011de3532140c03a364ac23b231fa2645f0847c2.001.1","noaa_urn:oid:2.49.0.1.840.0.a436bd4be2050301804386ce962e7ad26fb20c65.001.1","noaa_urn:oid:2.49.0.1.840.0.a5afc0ef18919fcd6e71ea3cfb24cb5943f5673d.001.1","noaa_urn:oid:2.49.0.1.840.0.3b2497e9778954496fd6aef3cd51b3c7f03855ce.001.1"] |
| Iem TypeSummary | M |
| Iem Magnitude | 45 |
| Iem Unit | MPH |
| Iem City | 5 SSE Islamorada |
| Iem County | GMZ052 |
| Iem State | FL |
| Iem Wfo | KEY |
| Iem Remark | A southerly wind gust of 39 knots, or 45 mph, was recorded by the XALG WeatherFlow mesonet site at Alligator Reef Light. |
| MergedSources | [{"id":"iem_M_25.230_-80.210_1773718680000","source":"iem","severity":"low","severityValue":25,"timestamp":1773718680000,"latitude":25.23,"longitude":-80.21},{"id":"iem_M_24.840_-80.860_1773714000000","source":"iem","severity":"low","severityValue":25,"timestamp":1773714000000,"latitude":24.84,"longitude":-80.86},{"id":"iem_M_24.850_-80.620_1773714180000","source":"iem","severity":"low","severityValue":25,"timestamp":1773714180000,"latitude":24.85,"longitude":-80.62}] |
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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Calamity.live data shows a weather event with CalamityScore 39/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.