Right now
The most recent data we hold from NOAA arrived 3 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 19 May 2026 at 00:00 UTC. It is kept here as a record.
It is the 16th strongest of the 130 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued May 18 at 3:09PM EDT until May 18 at 8:00PM EDT by NWS Grand Rapids MI
Nearby, since 10 March 2026
- September 3, 2026 · score 28 · 0.0 km
- August 9, 2026 · score 22 · 0.0 km
- August 8, 2026 · score 22 · 0.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 out of 100, at 59 % 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) | 22 / 100 |
| Our confidence | 59% |
| Coordinates | 44.3000, -85.6000 |
| Nearest City | Traverse City (51 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-18T19:09:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Watch_noaa_urn:oid:2.49.0.1.840.0.d804c82ea1b8431f02cc90b3f9f4b2b7 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Barry, MI; Calhoun, MI; Clare, MI; Clinton, MI; Eaton, MI; Gratiot, MI; Ingham, MI; Ionia, MI; Isabella, MI; Jackson, MI; Kent, MI; Lake, MI; Mecosta, MI; Montcalm, MI; Newaygo, MI; Osceola, MI; St. Clair River; Detroit River; Lake St. Clair Open Lake (U.S. Portion); Michigan Waters of Lake Erie from Detroit River to North Cape MI; Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner Saginaw Bay; Inner Saginaw Bay SW of Point Au Gres to Bay Port MI; Port Austin to Harbor Beach MI; Harbor Beach to Port Sanilac MI; Port Sanilac to Port Huron MI; Lake Huron from Port Austin to Harbor Beach 5NM Off Shore to the US/Canadian border; Lake Huron from Harbor Beach to Port Sanilac 5NM Off Shore to US/Canadian border; Lake Huron from Port Sanilac to Port Huron 5NM Off Shore to US/Canadian border; Bay, MI; Genesee, MI; Huron, MI; Lapeer, MI; Lenawee, MI; Livingston, MI; Macomb, MI; Midland, MI; Monroe, MI; Oakland, MI; Saginaw, MI; St. Clair, MI; Sanilac, MI; Shiawassee, MI; Tuscola, MI; Washtenaw, MI; Wayne, MI and 2 more areas |
| Headline | Severe Thunderstorm Watch issued May 18 at 3:09PM EDT until May 18 at 8:00PM EDT by NWS Grand Rapids MI |
| Expires | 2026-05-18T20:00:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | false |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.d804c82ea1b8431f02cc90b3f9f4b2b7d82a7dea.002.1","noaa_urn:oid:2.49.0.1.840.0.1668be346cf8107c8451a4cf00a36b591d6535ec.002.1","noaa_urn:oid:2.49.0.1.840.0.1668be346cf8107c8451a4cf00a36b591d6535ec.001.1","noaa_urn:oid:2.49.0.1.840.0.1e31328d7319e7227037f1cd3ef424747aa35ec4.002.1","noaa_urn:oid:2.49.0.1.840.0.1e31328d7319e7227037f1cd3ef424747aa35ec4.001.1"] |
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 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 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.