This alert expired on 18 May 2026 at 21:20 UTC. It is kept here as a record.
No stronger detection stands among the 46 recorded within 20 km of this point since 4 April 2026 — 18 others scored the same. Another comparable one was recorded here earlier the same day. 10 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 18 at 5:11PM EDT until May 18 at 5:15PM EDT by NWS Detroit/Pontiac MI
An estimated 1,595,953 people live within 50 km of this point.
Nearby, since 4 April 2026
- June 11, 2026 · score 46 · 8.7 km
- May 18, 2026 · score 52 · 12.2 km
- May 9, 2026 · score 52 · 13.1 km
How we know
Confirmed by 7 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 89 % 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 | 89% |
| Coordinates | 42.8005, -83.1610 |
| Nearest City | Auburn Hills (14 km) |
| Population Exposed | 1.6M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T21:11:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.5b6762ae986728acf176527c77ccd1eb |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Monroe, MI; Sanilac, MI; Lucas, OH; Wood, OH and 5 more areas |
| Headline | Severe Thunderstorm Warning issued May 18 at 5:11PM EDT until May 18 at 5:15PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-05-18T17:20:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5b6762ae986728acf176527c77ccd1eb9f116313.001.1","noaa_urn:oid:2.49.0.1.840.0.3edc07cfd229c171dda2422230ef0ae40c000b68.001.1","noaa_urn:oid:2.49.0.1.840.0.981249ad3e5652cdd4acdafea38311096989f5b9.001.1","noaa_urn:oid:2.49.0.1.840.0.0053ff9d38e9489ec94903ace0b441dc97cc6c2a.001.1","noaa_urn:oid:2.49.0.1.840.0.8a26adbb91a02c1c51a9eee3b6e9f0debce7c8df.001.1","noaa_urn:oid:2.49.0.1.840.0.376d13cf819247051bd73b6ebdab00c0d46e511e.001.1","noaa_urn:oid:2.49.0.1.840.0.3248d12c5ec29a6926f6a18b400133adeb2c42e4.001.1","noaa_urn:oid:2.49.0.1.840.0.68b1589d33d4f40c50a4988da6aa5e8b61d06990.001.1"] |
| Iem TypeSummary | D |
| Iem City | 1 NW Rochester Hills |
| Iem County | Oakland |
| Iem State | MI |
| Iem Wfo | DTX |
| Iem Remark | Report of large tree limb down on house causing damage to roofing |
| Google News RssFeed | weather |
| Google News SourceName | ClickOnDetroit | WDIV Local 4 |
| MergedSources | [{"id":"iem_D_42.660_-83.170_1779132240000","source":"iem","severity":"low","severityValue":25,"timestamp":1779132240000,"latitude":42.66,"longitude":-83.17},{"id":"gnews_weather_494202_117","source":"google_news","severity":"medium","severityValue":40,"timestamp":1779130324000,"latitude":42.33,"longitude":-83.05},{"id":"gnews_weather_494203_121","source":"google_news","severity":"medium","severityValue":40,"timestamp":1779131397000,"latitude":42.33,"longitude":-83.05},{"id":"gnews_weather_494203_127","source":"google_news","severity":"medium","severityValue":40,"timestamp":1779133500000,"latitude":42.33,"longitude":-83.05},{"id":"gnews_weather_494204_131","source":"google_news","severity":"medium","severityValue":40,"timestamp":1779134883000,"latitude":42.33,"longitude":-83.05},{"id":"gnews_weather_494201_140","source":"google_news","severity":"medium","severityValue":40,"timestamp":1779124179000,"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 Auburn Hills (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.