This alert expired on 21 July 2026 at 20:45 UTC. It is kept here as a record.
It is the 66th strongest of the 100 detections recorded within 20 km of this point since 17 March 2026. The last comparable one was on 15 July 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 21 at 4:07PM EDT until July 21 at 4:45PM EDT by NWS Upton NY
An estimated 26,949,088 people live within 50 km of this point.
Nearby, since 17 March 2026
- June 12, 2026 · score 46 · 3.2 km
- August 3, 2026 · score 66 · 4.8 km
- June 12, 2026 · score 46 · 9.4 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 out of 100, at 79 % 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) | 46 / 100 |
| Our confidence | 79% |
| Coordinates | 40.7972, -73.6089 |
| Nearest City | Westbury (4 km) |
| Population Exposed | 26.9M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T20:07:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.30c8326a93279bafcd1bf220c8bc5c6c |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Long Island Sound West of New Haven CT/Port Jefferson NY; New York Harbor; South Shore Bays from Jones Inlet through Shinnecock Bay; Fire Island Inlet NY to Moriches Inlet NY out 20 NM; Sandy Hook NJ to Fire Island Inlet NY out 20 NM |
| Headline | Special Marine Warning issued July 21 at 4:07PM EDT until July 21 at 4:45PM EDT by NWS Upton NY |
| Expires | 2026-07-21T16:45:00-04:00 |
| SenderName | NWS Upton NY |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.30c8326a93279bafcd1bf220c8bc5c6cc84f2eb5.001.1","noaa_urn:oid:2.49.0.1.840.0.fe91eac4583d920e8a5ac4777266000709366e60.001.1"] |
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 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 Westbury?
Calamity.live data shows a weather event with CalamityScore 46/100, near Westbury (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.