This alert expired on 4 July 2026 at 21:45 UTC. It is kept here as a record.
No stronger detection stands among the 34 recorded within 20 km of this point since 4 April 2026 — 9 others scored the same. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 4 at 5:01PM EDT until July 4 at 5:45PM EDT by NWS Detroit/Pontiac MI
An estimated 1,315,631 people live within 50 km of this point.
Nearby, since 4 April 2026
- May 18, 2026 · score 52 · 15.2 km
- May 18, 2026 · score 52 · 20.2 km
- July 18, 2026 · score 48 · 27.0 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 52 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) | 52 / 100 |
| Our confidence | 82% |
| Coordinates | 42.8100, -82.8488 |
| Nearest City | Shelby (21 km) |
| Population Exposed | 1.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T21:01:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.c058bc83239787b74888420c8a0853943933f6f7.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Macomb, MI |
| Headline | Severe Thunderstorm Warning issued July 4 at 5:01PM EDT until July 4 at 5:45PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-07-04T17:45:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 55 |
| Iem Unit | mph |
| Iem City | 1 NE Flint Bishop Airpo |
| Iem County | Genesee |
| Iem State | MI |
| Iem Wfo | DTX |
| Iem Remark | Measured at Flint Bishop Airport |
| MergedSources | [{"id":"iem_G_42.980_-83.730_1783195860000","source":"iem","severity":"low","severityValue":25,"timestamp":1783195860000,"latitude":42.98,"longitude":-83.73}] |
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 Shelby (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.