This alert expired on 3 September 2026 at 19:45 UTC. It is kept here as a record.
It is one of only 3 we have recorded within 20 km of this point since 3 September 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Tornado Warning issued September 3 at 12:35PM PDT until September 3 at 12:45PM PDT by NWS Portland OR
An estimated 350,179 people live within 50 km of this point.
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 67 out of 100, at 81 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Critical |
| Calamity Score (ours) | 67 / 100 |
| Our confidence | 81% |
| Coordinates | 45.9744, -122.8500 |
| Nearest City | Longview (20 km) |
| Population Exposed | 350.2K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-09-03T19:35:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.cc4a308c7f6ece5f9831ba13a0c45c4a1b7b6e12.001.1 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Columbia, OR |
| Headline | Tornado Warning issued September 3 at 12:35PM PDT until September 3 at 12:45PM PDT by NWS Portland OR |
| Expires | 2026-09-03T12:45:00-07:00 |
| SenderName | NWS Portland OR |
| HasExactCoords | true |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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 Longview?
Calamity.live data shows a weather event with CalamityScore 67/100, near Longview (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.