This alert expired on 18 May 2026 at 21:30 UTC. It is kept here as a record.
It is the 4th strongest of the 25 detections recorded within 20 km of this point since 4 April 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 18 at 4:09PM EDT until May 18 at 5:30PM EDT by NWS Cleveland OH
An estimated 405,385 people live within 50 km of this point.
Nearby, since 4 April 2026
- July 15, 2026 · score 48 · 13.1 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 79 % 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) | 43 / 100 |
| Our confidence | 79% |
| Coordinates | 42.8040, -83.8277 |
| Nearest City | Flint (26 km) |
| Population Exposed | 405.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T20:09:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.5cb96de7542c0e04887bcdb00af61de3 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Lucas, OH; Wood, OH; St. Clair, MI; Genesee, MI and 11 more areas |
| Headline | Severe Thunderstorm Warning issued May 18 at 4:09PM EDT until May 18 at 5:30PM EDT by NWS Cleveland OH |
| Expires | 2026-05-18T17:30:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | true |
| MergedCount | 14 |
| MergedIds | ["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.c4a926e3cbacd04812f6ee5df274ae6bcc1a7ec7.001.1","noaa_urn:oid:2.49.0.1.840.0.94ce1e0ebfb0baa1b3d493cc22d992831d29c1d2.001.1","noaa_urn:oid:2.49.0.1.840.0.34d32c45b8bac6bfd66e7b512ac7dbefaa380900.001.1","noaa_urn:oid:2.49.0.1.840.0.4e140e2cee8f3ae4470fc04f6ee1cc9a72d0083d.001.1","noaa_urn:oid:2.49.0.1.840.0.32d6a12428d3a3a0a75f97fca4f7cb9e237d8d75.001.1","noaa_urn:oid:2.49.0.1.840.0.5b3eec1ecc8d7f0d9dd6e80eac4356efc2d8d209.001.1","noaa_urn:oid:2.49.0.1.840.0.42c1a84a57a2d9b94a65db3c519304b4a07cf41f.001.1","noaa_urn:oid:2.49.0.1.840.0.f761fcf763f73399a8411068cd461ec8131b6688.001.1","noaa_urn:oid:2.49.0.1.840.0.70ef42ed6c6e3bbe1df8055b18be86d3f64a4b1d.001.1","noaa_urn:oid:2.49.0.1.840.0.bf42bc01a661979f1f99d7fca9d4472c282c00d5.001.1"] |
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 43/100, near Flint (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.