This alert expired on 20 May 2026 at 23:45 UTC. It is kept here as a record.
It is the 3rd strongest of the 68 detections recorded within 20 km of this point since 12 March 2026. The last comparable one was on 17 March 2026.
What the source measured
NOAA reported: Special Marine Warning issued May 20 at 6:43PM EDT until May 20 at 7:45PM EDT by NWS Upton NY
An estimated 25,018,580 people live within 50 km of this point.
Nearby, since 12 March 2026
- June 12, 2026 · score 52 · 6.4 km
- May 20, 2026 · score 52 · 9.3 km
- March 17, 2026 · score 52 · 9.3 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 89 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 52 / 100 |
| Our confidence | 89% |
| Coordinates | 40.6151, -73.5305 |
| Nearest City | Merrick (5 km) |
| Population Exposed | 25.0M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-20T22:43:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.c4f948bda6f5a70c69ed42914b42f1fc |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Long Island Sound East of New Haven CT/Port Jefferson NY to the Mouth of the Connecticut River; Long Island Sound West of New Haven CT/Port Jefferson NY; New York Harbor; Sandy Hook NJ to Fire Island Inlet NY out 20 NM; Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 NM; Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 NM; Waters from Sandy Hook NJ to Manasquan Inlet NJ from 20 to 40 NM; Waters from Manasquan Inlet NJ to Little Egg Inlet NJ from 20 to 60 NM |
| Headline | Special Marine Warning issued May 20 at 6:43PM EDT until May 20 at 7:45PM EDT by NWS Upton NY |
| Expires | 2026-05-20T19:45:00-04:00 |
| SenderName | NWS Upton NY |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.c4f948bda6f5a70c69ed42914b42f1fc70171770.001.1","noaa_urn:oid:2.49.0.1.840.0.f104cbb888214d698177fd0b9c62733a245cf3ef.001.1","noaa_urn:oid:2.49.0.1.840.0.b0801c509d818908f06ce840657826251d9d0072.001.1"] |
| Iem TypeSummary | D |
| Iem City | 2 S Golden's Bridge |
| Iem County | Westchester |
| Iem State | NY |
| Iem Wfo | OKX |
| Iem Remark | Tree down on I-684 near Saw Mill River Parkway exit. |
| MergedSources | [{"id":"iem_D_41.260_-73.670_1779312600000","source":"iem","severity":"low","severityValue":25,"timestamp":1779312600000,"latitude":41.26,"longitude":-73.67},{"id":"iem_H_41.040_-73.760_1779309840000","source":"iem","severity":"low","severityValue":25,"timestamp":1779309840000,"latitude":41.04,"longitude":-73.76},{"id":"iem_D_41.250_-73.680_1779312600000","source":"iem","severity":"low","severityValue":25,"timestamp":1779312600000,"latitude":41.25,"longitude":-73.68}] |
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 10 February 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.
Want to know when something happens near Merrick?
Calamity.live data shows a weather event with CalamityScore 52/100, near Merrick (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.