This alert expired on 10 August 2026 at 10:15 UTC. It is kept here as a record.
No stronger detection stands among the 15 recorded within 20 km of this point since 15 April 2026 — 3 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 10 at 5:09AM EDT until August 10 at 6:15AM EDT by NWS Detroit/Pontiac MI
An estimated 277,664 people live within 50 km of this point.
Nearby, since 15 April 2026
- June 17, 2026 · score 37 · 12.6 km
- August 10, 2026 · score 43 · 14.2 km
- May 18, 2026 · score 43 · 17.6 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 82 % 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) | 43 / 100 |
| Our confidence | 82% |
| Coordinates | 42.2382, -84.0573 |
| Nearest City | Ann Arbor (27 km) |
| Population Exposed | 277.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-10T09:09:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.6fcd6e6ab85dd66aba2eded08fff8316 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Washtenaw, MI; Jackson, MI |
| Headline | Severe Thunderstorm Warning issued August 10 at 5:09AM EDT until August 10 at 6:15AM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-08-10T06:15:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6fcd6e6ab85dd66aba2eded08fff831610654af6.001.1","noaa_urn:oid:2.49.0.1.840.0.138dcdeafe0c5c52bcd1e64a71f328e86c28e559.001.1"] |
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 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.
Calamity.live data shows a weather event with CalamityScore 43/100, near Ann Arbor (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.