This alert expired on 18 July 2026 at 19:15 UTC. It is kept here as a record.
It is the 7th strongest of the 26 detections recorded within 20 km of this point since 4 April 2026. Another comparable one was recorded here earlier the same day. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 18 at 2:04PM EDT until July 18 at 3:15PM EDT by NWS Detroit/Pontiac MI
An estimated 785,289 people live within 50 km of this point.
Nearby, since 4 April 2026
- June 11, 2026 · score 46 · 12.5 km
- June 25, 2026 · score 43 · 14.9 km
- May 18, 2026 · score 52 · 15.3 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 48 out of 100, at 80 % 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) | 48 / 100 |
| Our confidence | 80% |
| Coordinates | 42.9811, -83.0837 |
| Nearest City | Auburn Hills (34 km) |
| Population Exposed | 785.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-18T18:04:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.54e43dd9ee39657b15e47d4560d20b3d |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Lapeer, MI; Macomb, MI; St. Clair, MI; Lapeer, MI; Genesee, MI; Tuscola, MI |
| Headline | Severe Thunderstorm Warning issued July 18 at 2:04PM EDT until July 18 at 3:15PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-07-18T15:15:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.54e43dd9ee39657b15e47d4560d20b3d4002a824.001.1","noaa_urn:oid:2.49.0.1.840.0.0f47b0ce60dc4fc853799efa29becb1771e4233a.001.1","noaa_urn:oid:2.49.0.1.840.0.dea02c722b6720efb188c200d28d8a469ddad683.001.1"] |
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 48/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.