Right now
The most recent data we hold from NOAA arrived 70 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 23:35 UTC. It is kept here as a record.
No stronger detection stands among the 55 recorded within 20 km of this point since 12 March 2026 — 36 others scored the same. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 20 at 7:26PM EDT until May 20 at 7:30PM EDT by NWS Upton NY
Urban PEI: 12,690,625 within a heuristic 50 km radius; not unique people.
Nearby, since 12 March 2026
- March 17, 2026 · score 52 · 1.6 km
- June 12, 2026 · score 52 · 4.9 km
- June 12, 2026 · score 52 · 8.8 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 52 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 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 |
| Legacy data-support index | 0.85/1 |
| Coordinates | 40.5956, -73.4230 |
| Nearest City | East Massapequa (8 km) |
| Urban exposure index (PEI) | 12.7M within 50 km |
| Impact Tier | significant |
| Date | 2026-05-20 — time not reported by the source |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.d3f7ae7798390ffb206ded698ae8933e |
Physical priority index · v1. 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: 2026-05-20 — time not reported.
First archived: 2026-05-20T23:27:08.493Z. 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 | New York Harbor; Sandy Hook NJ to Fire Island Inlet NY out 20 NM; 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; Waters from Fire Island Inlet NY to Moriches Inlet NY from 20 to 60 NM; Waters from Sandy Hook NJ to Fire Island Inlet NY out 20 to 60 NM; 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 and 1 more areas |
| Headline | Special Marine Warning issued May 20 at 7:26PM EDT until May 20 at 7:30PM EDT by NWS Upton NY |
| Expires | 2026-05-20T19:35:00-04:00 |
| SenderName | NWS Upton NY |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.d3f7ae7798390ffb206ded698ae8933ec2328ca9.001.1","noaa_urn:oid:2.49.0.1.840.0.d4e5fd74b9f3c50691ff79f0332f0788060fd035.001.1","noaa_urn:oid:2.49.0.1.840.0.c4f948bda6f5a70c69ed42914b42f1fc70171770.001.1","noaa_urn:oid:2.49.0.1.840.0.b0801c509d818908f06ce840657826251d9d0072.001.1"] |
| 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.
Review the area, threshold and delivery channel in your account.
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