This alert expired on 7 August 2026 at 23:45 UTC. It is kept here as a record.
No stronger detection stands among the 32 recorded within 20 km of this point since 17 March 2026 — 6 others scored the same. The last comparable one was on 19 July 2026.
What the source measured
NOAA reported: Special Marine Warning issued August 7 at 6:21PM EDT until August 7 at 7:45PM EDT by NWS Upton NY
An estimated 2,646,226 people live within 50 km of this point.
Nearby, since 17 March 2026
- August 10, 2026 · score 52 · 7.6 km
- June 12, 2026 · score 46 · 8.3 km
- July 19, 2026 · score 52 · 9.1 km
How we know
Confirmed by 7 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 88 % 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 | 88% |
| Coordinates | 40.7780, -73.1595 |
| Nearest City | Central Islip (4 km) |
| Population Exposed | 2.6M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-07T22:21:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.bd9b18d6633b2d8cbc9f05f3f94959b45b8a8f0d.001.1 |
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; 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 |
| Headline | Special Marine Warning issued August 7 at 6:21PM EDT until August 7 at 7:45PM EDT by NWS Upton NY |
| Expires | 2026-08-07T19:45:00-04:00 |
| SenderName | NWS Upton NY |
| HasExactCoords | true |
| Iem TypeSummary | M |
| Iem Magnitude | 48 |
| Iem Unit | MPH |
| Iem City | 1 S Mamaroneck |
| Iem County | ANZ335 |
| Iem State | NY |
| Iem Wfo | OKX |
| Iem Remark | Mesonet station XLAR Larchmont Harbor. |
| MergedSources | [{"id":"iem_F_40.990_-73.910_1786143600000","source":"iem","severity":"low","severityValue":25,"timestamp":1786143600000,"latitude":40.99,"longitude":-73.91},{"id":"iem_M_40.950_-73.400_1786143420000","source":"iem","severity":"low","severityValue":25,"timestamp":1786143420000,"latitude":40.95,"longitude":-73.4},{"id":"iem_M_40.660_-73.300_1786145100000","source":"iem","severity":"low","severityValue":25,"timestamp":1786145100000,"latitude":40.66,"longitude":-73.3},{"id":"iem_D_40.690_-73.790_1786144380000","source":"iem","severity":"low","severityValue":25,"timestamp":1786144380000,"latitude":40.69,"longitude":-73.79},{"id":"iem_M_40.900_-73.630_1786142520000","source":"iem","severity":"low","severityValue":25,"timestamp":1786142520000,"latitude":40.9,"longitude":-73.63},{"id":"iem_M_40.920_-73.730_1786141920000","source":"iem","severity":"low","severityValue":25,"timestamp":1786141920000,"latitude":40.92,"longitude":-73.73}] |
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 Central Islip?
Calamity.live data shows a weather event with CalamityScore 52/100, near Central Islip (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 187 scientific monitoring sources.