This alert expired on 7 June 2026 at 00:30 UTC. It is kept here as a record.
It is the 6th strongest of the 96 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 6 at 7:56PM EDT until June 6 at 8:30PM EDT by NWS Upton NY
An estimated 27,265,019 people live within 50 km of this point.
Nearby, since 17 March 2026
- March 17, 2026 · score 52 · 3.9 km
- August 7, 2026 · score 66 · 6.9 km
- June 12, 2026 · score 46 · 8.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 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) | 52 / 100 |
| Our confidence | 79% |
| Coordinates | 40.9340, -73.6868 |
| Nearest City | Mamaroneck (4 km) |
| Population Exposed | 27.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-06T23:56:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.6aafce742c5de3bb86d3d921e5e3b798 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Orange, NY; Putnam, NY; Rockland, NY; Westchester, NY; Middlesex, CT; New London, CT; Nassau, NY; Suffolk, NY and 4 more areas |
| Headline | Severe Thunderstorm Warning issued June 6 at 7:56PM EDT until June 6 at 8:30PM EDT by NWS Upton NY |
| Expires | 2026-06-06T20:30:00-04:00 |
| SenderName | NWS Upton NY |
| HasExactCoords | true |
| MergedCount | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6aafce742c5de3bb86d3d921e5e3b7985bcad8e5.001.1","noaa_urn:oid:2.49.0.1.840.0.44d2fa80b57e4302e6f8cbd1fc2ecc794dfb9305.001.1","noaa_urn:oid:2.49.0.1.840.0.04b858e37af24b34a3058dbf14b827c3381d7b01.001.1","noaa_urn:oid:2.49.0.1.840.0.7c5d50ad48dc84ec97b6f14f90be6a07ded55fe4.001.1","noaa_urn:oid:2.49.0.1.840.0.62e81c75c493bee28c06cc2f99e0b32dfc512ee8.001.1","noaa_urn:oid:2.49.0.1.840.0.7f19e3975351b0c551027116fdd25efb37813b2f.001.1","noaa_urn:oid:2.49.0.1.840.0.3874d94ce6ca0d21903a01c58a8bdb03f0c79df2.001.1"] |
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 Mamaroneck?
Calamity.live data shows a weather event with CalamityScore 52/100, near Mamaroneck (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.