This alert expired on 17 May 2026 at 01:00 UTC. It is kept here as a record.
It is the strongest of the 6 detections recorded within 20 km of this point since 14 March 2026. The last comparable one was on 2 April 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 16 at 5:39PM PDT until May 16 at 6:00PM PDT by NWS Pendleton OR
An estimated 512,950 people live within 50 km of this point.
Nearby, since 14 March 2026
- March 16, 2026 · score 43 · 18.5 km
- March 14, 2026 · score 43 · 18.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 48 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) | 48 / 100 |
| Our confidence | 79% |
| Coordinates | 46.0050, -118.8370 |
| Nearest City | Kennewick (33 km) |
| Population Exposed | 513.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-17T00:39:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.d4d592646be96d69b5be94d9e548f03c1e825e4e.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Umatilla, OR; Walla Walla, WA |
| Headline | Severe Thunderstorm Warning issued May 16 at 5:39PM PDT until May 16 at 6:00PM PDT by NWS Pendleton OR |
| Expires | 2026-05-16T18:00:00-07:00 |
| SenderName | NWS Pendleton OR |
| 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 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 in this area?
Calamity.live data shows a weather event with CalamityScore 48/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.