This alert expired on 3 July 2026 at 23:15 UTC. It is kept here as a record.
No stronger detection stands among the 31 recorded within 20 km of this point since 13 March 2026 — 18 others scored the same. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 3 at 6:40PM EDT until July 3 at 7:15PM EDT by NWS Detroit/Pontiac MI
An estimated 3,242,885 people live within 50 km of this point.
Nearby, since 13 March 2026
- June 11, 2026 · score 46 · 2.5 km
- April 4, 2026 · score 52 · 5.4 km
- March 13, 2026 · score 52 · 13.8 km
How we know
Confirmed by 6 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 88 % 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) | 52 / 100 |
| Our confidence | 88% |
| Coordinates | 42.4260, -83.3925 |
| Nearest City | Livonia (7 km) |
| Population Exposed | 3.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-03T22:40:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.f8dbdff3df6450fdc77dbe7109e62688 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Monroe, MI; Wayne, MI; Genesee, MI; Oakland, MI |
| Headline | Severe Thunderstorm Warning issued July 3 at 6:40PM EDT until July 3 at 7:15PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-07-03T19:15:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f8dbdff3df6450fdc77dbe7109e62688aa435529.001.1","noaa_urn:oid:2.49.0.1.840.0.d0d5e8a602a5431c68c9c0190b62715c5e4d2831.001.1"] |
| Iem TypeSummary | D |
| Iem City | 1 N Dexter |
| Iem County | Washtenaw |
| Iem State | MI |
| Iem Wfo | DTX |
| Iem Remark | Report of multiple trees on roadway around Mast Rd and Joy Rd |
| Google News RssFeed | weather |
| Google News SourceName | The Detroit News |
| MergedSources | [{"id":"iem_D_42.150_-84.020_1783115400000","source":"iem","severity":"low","severityValue":25,"timestamp":1783115400000,"latitude":42.15,"longitude":-84.02},{"id":"iem_G_42.240_-83.530_1783115940000","source":"iem","severity":"low","severityValue":25,"timestamp":1783115940000,"latitude":42.24,"longitude":-83.53},{"id":"iem_D_42.320_-84.020_1783113960000","source":"iem","severity":"low","severityValue":25,"timestamp":1783113960000,"latitude":42.32,"longitude":-84.02},{"id":"iem_D_42.340_-83.880_1783114680000","source":"iem","severity":"low","severityValue":25,"timestamp":1783114680000,"latitude":42.34,"longitude":-83.88},{"id":"gnews_weather_495310_229","source":"google_news","severity":"medium","severityValue":40,"timestamp":1783116120000,"latitude":42.33,"longitude":-83.05}] |
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 52/100, near Livonia (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.