This alert expired on 20 May 2026 at 00:45 UTC. It is kept here as a record.
It is the 4th strongest of the 97 detections recorded within 20 km of this point since 9 March 2026. Another comparable one was recorded here earlier the same day. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 19 at 8:26PM EDT until May 19 at 8:45PM EDT by NWS Buffalo NY
An estimated 1,083,910 people live within 50 km of this point.
Nearby, since 9 March 2026
- May 19, 2026 · score 52 · 1.4 km
- July 4, 2026 · score 52 · 4.6 km
- July 21, 2026 · score 52 · 6.4 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 91 % 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) | 52 / 100 |
| Our confidence | 91% |
| Coordinates | 43.1256, -78.8283 |
| Nearest City | North Tonawanda (10 km) |
| Population Exposed | 1.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-20T00:26:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.b97d981c4abd9cb571dc32e318556bbc08c56d3f.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Erie, NY; Genesee, NY; Niagara, NY; Orleans, NY |
| Headline | Severe Thunderstorm Warning issued May 19 at 8:26PM EDT until May 19 at 8:45PM EDT by NWS Buffalo NY |
| Expires | 2026-05-19T20:45:00-04:00 |
| SenderName | NWS Buffalo NY |
| HasExactCoords | true |
| Iem TypeSummary | D |
| Iem City | North Tonawanda |
| Iem County | Niagara |
| Iem State | NY |
| Iem Wfo | BUF |
| Iem Remark | Tree fell down on Wheatfield Street, partially blocking traffic. |
| MergedSources | [{"id":"iem_D_43.180_-79.040_1779235500000","source":"iem","severity":"low","severityValue":25,"timestamp":1779235500000,"latitude":43.18,"longitude":-79.04},{"id":"iem_D_43.040_-78.870_1779235920000","source":"iem","severity":"low","severityValue":25,"timestamp":1779235920000,"latitude":43.04,"longitude":-78.87}] |
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 North Tonawanda?
Calamity.live data shows a weather event with CalamityScore 52/100, near North Tonawanda (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.