Right now
The most recent data we hold from NOAA arrived 2 minutes ago, and this point is in it.
3 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
This alert expired on 11 September 2026 at 22:00 UTC. It is kept here as a record.
It is the 17th strongest of the 24 detections recorded within 20 km of this point since 12 July 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 11 at 2:50PM MST until September 11 at 3:00PM MST by NWS Flagstaff AZ
An estimated 84,096 people live within 50 km of this point.
Nearby, since 12 July 2026
- August 6, 2026 · score 39 · 18.7 km
- August 9, 2026 · score 39 · 19.5 km
- July 22, 2026 · score 34 · 23.1 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 32 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 v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 32 / 100 |
| Our confidence | 79% |
| Coordinates | 34.5440, -112.0440 |
| Nearest City | Prescott Valley (26 km) |
| Population Exposed | 84.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-11T21:50:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.67134820f442b737628c979e097c126daa024a83.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Yavapai, AZ |
| Headline | Severe Thunderstorm Warning issued September 11 at 2:50PM MST until September 11 at 3:00PM MST by NWS Flagstaff AZ |
| Expires | 2026-09-11T15:00:00-07:00 |
| SenderName | NWS Flagstaff AZ |
| 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.
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