This alert expired on 10 May 2026 at 00:49 UTC. It is kept here as a record.
It is the 5th strongest of the 48 detections recorded within 20 km of this point since 17 March 2026. 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: Severe Thunderstorm Warning issued May 9 at 8:39PM EDT until May 9 at 8:45PM EDT by NWS Buffalo NY
An estimated 355,822 people live within 50 km of this point.
Nearby, since 17 March 2026
- May 13, 2026 · score 43 · 5.3 km
- June 11, 2026 · score 37 · 8.0 km
- July 19, 2026 · score 43 · 11.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 79 % 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) | 43 / 100 |
| Our confidence | 79% |
| Coordinates | 42.9671, -77.2607 |
| Nearest City | Henrietta (30 km) |
| Population Exposed | 355.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-10T00:39:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.befb17dedb2f98bb77f53f398d82db71251678fd.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Livingston, NY; Monroe, NY; Ontario, NY; Wayne, NY |
| Headline | Severe Thunderstorm Warning issued May 9 at 8:39PM EDT until May 9 at 8:45PM EDT by NWS Buffalo NY |
| Expires | 2026-05-09T20:49:00-04:00 |
| SenderName | NWS Buffalo NY |
| HasExactCoords | true |
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 Henrietta?
Calamity.live data shows a weather event with CalamityScore 43/100, near Henrietta (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.