This alert expired on 12 August 2026 at 23:15 UTC. It is kept here as a record.
No stronger detection stands among the 23 recorded within 20 km of this point since 17 March 2026 — 4 others scored the same. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 12 at 6:24PM EDT until August 12 at 7:15PM EDT by NWS Buffalo NY
An estimated 288,992 people live within 50 km of this point.
Nearby, since 17 March 2026
- July 19, 2026 · score 43 · 14.9 km
- September 2, 2026 · score 37 · 21.0 km
- June 11, 2026 · score 37 · 21.1 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 77 % 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 | 77% |
| Coordinates | 42.7609, -77.4256 |
| Nearest City | Henrietta (36 km) |
| Population Exposed | 289.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-12T22:24:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.fd2c91fa165d2f6bad0bd86085be637e |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Livingston, NY; Ontario, NY; Ontario, NY |
| Headline | Severe Thunderstorm Warning issued August 12 at 6:24PM EDT until August 12 at 7:15PM EDT by NWS Buffalo NY |
| Expires | 2026-08-12T19:15:00-04:00 |
| SenderName | NWS Buffalo NY |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.fd2c91fa165d2f6bad0bd86085be637e55d2a550.001.1","noaa_urn:oid:2.49.0.1.840.0.549321c469af7aea27131eb33c43206ca9c98197.001.1"] |
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 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 in this area?
Calamity.live data shows a weather event with CalamityScore 43/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.