Right now
The most recent data we hold from NOAA arrived 4 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 18 May 2026 at 21:00 UTC. It is kept here as a record.
It is the 4th strongest of the 57 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 18 at 4:26PM EDT until May 18 at 5:00PM EDT by NWS Detroit/Pontiac MI
An estimated 1,335,704 people live within 50 km of this point.
Nearby, since 16 March 2026
- May 18, 2026 · score 52 · 0.6 km
- September 4, 2026 · score 9 · 5.9 km
- September 3, 2026 · score 76 · 12.8 km
How we know
Confirmed by 6 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.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 52 / 100 |
| Our confidence | 89% |
| Coordinates | 42.2835, -83.6786 |
| Nearest City | Ann Arbor (5 km) |
| Population Exposed | 1.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T20:26:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.5f4d4f06aebdd09c46d818307e696885 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Genesee, MI; Lenawee, MI; Lapeer, MI and 7 more areas |
| Headline | Severe Thunderstorm Warning issued May 18 at 4:26PM EDT until May 18 at 5:00PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-05-18T17:00:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 10 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5f4d4f06aebdd09c46d818307e6968851f070515.001.1","noaa_urn:oid:2.49.0.1.840.0.b31e30af91ca74566c18b6adf99648f350d15666.001.1","noaa_urn:oid:2.49.0.1.840.0.92eb96f86063a3bea059f59dfc303939f65bcd0c.001.1","noaa_urn:oid:2.49.0.1.840.0.fa84ae9bddf325fa885e8813a9fb28bf754f3532.001.1","noaa_urn:oid:2.49.0.1.840.0.fa1ac678d26198afb1d9d30556c391c2c1e946a5.001.1","noaa_urn:oid:2.49.0.1.840.0.107a5a8b7a8c79ced8d72a4a7c77da337d78e238.001.1","noaa_urn:oid:2.49.0.1.840.0.a83e185b6abbbdebff44f27c882250973f2ec9fd.001.1","noaa_urn:oid:2.49.0.1.840.0.899cb54fca11c69016690b4b397b5bd487fb2ed8.001.1","noaa_urn:oid:2.49.0.1.840.0.5cb96de7542c0e04887bcdb00af61de3096b5684.001.1","noaa_urn:oid:2.49.0.1.840.0.10de0c1a013f30bb49b91a42b73f0c72c5cd6d17.001.1"] |
| Google News RssFeed | weather |
| Google News SourceName | ClickOnDetroit | WDIV Local 4 |
| MergedSources | [{"id":"gnews_weather_494202_148","source":"google_news","severity":"medium","severityValue":40,"timestamp":1779130324000,"latitude":42.33,"longitude":-83.05},{"id":"gnews_weather_494203_153","source":"google_news","severity":"medium","severityValue":40,"timestamp":1779131397000,"latitude":42.33,"longitude":-83.05},{"id":"gnews_weather_494203_158","source":"google_news","severity":"medium","severityValue":40,"timestamp":1779133500000,"latitude":42.33,"longitude":-83.05},{"id":"gnews_weather_494201_166","source":"google_news","severity":"medium","severityValue":40,"timestamp":1779124382000,"latitude":42.33,"longitude":-83.05},{"id":"gnews_weather_494201_169","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 8 March 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.
Want to know when something happens near Ann Arbor?
Calamity.live data shows a weather event with CalamityScore 52/100, near Ann Arbor (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.