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 21:15 UTC. It is kept here as a record.
It is the 9th strongest of the 68 detections recorded within 20 km of this point since 4 April 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 18 at 4:15PM EDT until May 18 at 5:15PM EDT by NWS Detroit/Pontiac MI
An estimated 908,559 people live within 50 km of this point.
Nearby, since 4 April 2026
- May 18, 2026 · score 52 · 9.5 km
- September 4, 2026 · score 46 · 11.9 km
- September 3, 2026 · score 67 · 15.9 km
How we know
Confirmed by 6 independent sources, including NOAA.
Our own score for this event is 48 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) | 48 / 100 |
| Our confidence | 89% |
| Coordinates | 42.6290, -83.8359 |
| Nearest City | Novi (34 km) |
| Population Exposed | 908.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T20:15:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.899cb54fca11c69016690b4b397b5bd4 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Monroe, MI; Hillsdale, MI; Fulton, OH; Henry, OH; Bay, MI; Midland, MI; Saginaw, MI and 10 more areas |
| Headline | Severe Thunderstorm Warning issued May 18 at 4:15PM EDT until May 18 at 5:15PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-05-18T17:15:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 13 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.899cb54fca11c69016690b4b397b5bd487fb2ed8.001.1","noaa_urn:oid:2.49.0.1.840.0.30403eec46b54b9a1c3b42219571a93b59e48678.002.1","noaa_urn:oid:2.49.0.1.840.0.bd8cbe55909112d717618ad6f30e619aecbea996.001.1","noaa_urn:oid:2.49.0.1.840.0.630cce77be4a45e74785246bde0f17be55cf8760.001.1","noaa_urn:oid:2.49.0.1.840.0.5b30c32c928caca1b253203140ca748cc63cfb9b.001.1","noaa_urn:oid:2.49.0.1.840.0.cf7e9494bb08326dfda41e42bda4d1cbb67a52be.001.1","noaa_urn:oid:2.49.0.1.840.0.5cb96de7542c0e04887bcdb00af61de3096b5684.001.1","noaa_urn:oid:2.49.0.1.840.0.676a53f997693e6ad45ba2519a2d5772b82540c1.001.1","noaa_urn:oid:2.49.0.1.840.0.7dc4fb407b74892a7eb9abf2b8c042b6ed21ce4c.001.1","noaa_urn:oid:2.49.0.1.840.0.ae6bb4004d8dddb9d6cc8ba65114e8206aa6c9a3.001.1","noaa_urn:oid:2.49.0.1.840.0.34d32c45b8bac6bfd66e7b512ac7dbefaa380900.001.1","noaa_urn:oid:2.49.0.1.840.0.c4a926e3cbacd04812f6ee5df274ae6bcc1a7ec7.001.1","noaa_urn:oid:2.49.0.1.840.0.f761fcf763f73399a8411068cd461ec8131b6688.001.1"] |
| 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 in this area?
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 185 scientific monitoring sources.