Right now
The most recent data we hold from NOAA arrived 2 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 20 May 2026 at 21:45 UTC. It is kept here as a record.
No stronger detection stands among the 47 recorded within 20 km of this point since 17 March 2026 — 21 others scored the same. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 20 at 4:48PM EDT until May 20 at 5:45PM EDT by NWS Upton NY
An estimated 6,795,117 people live within 50 km of this point.
Nearby, since 17 March 2026
- July 4, 2026 · score 52 · 4.8 km
- May 20, 2026 · score 52 · 9.5 km
- July 21, 2026 · score 52 · 10.4 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 85 % 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) | 52 / 100 |
| Our confidence | 85% |
| Coordinates | 41.0140, -73.4080 |
| Nearest City | Darien (9 km) |
| Population Exposed | 6.8M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-20T20:48:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.cc52d6e935cb498c7defc4b98dd34072c0c773ff.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Long Island Sound West of New Haven CT/Port Jefferson NY |
| Headline | Special Marine Warning issued May 20 at 4:48PM EDT until May 20 at 5:45PM EDT by NWS Upton NY |
| Expires | 2026-05-20T17:45:00-04:00 |
| SenderName | NWS Upton NY |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 0.75 |
| Iem Unit | Inch |
| Iem City | 1 N White Plains |
| Iem County | Westchester |
| Iem State | NY |
| Iem Wfo | OKX |
| MergedSources | [{"id":"iem_H_41.040_-73.760_1779309840000","source":"iem","severity":"low","severityValue":25,"timestamp":1779309840000,"latitude":41.04,"longitude":-73.76}] |
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.
Want to know when something happens near Darien?
Calamity.live data shows a weather event with CalamityScore 52/100, near Darien (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.