This alert expired on 18 May 2026 at 19:30 UTC. It is kept here as a record.
It is the 19th strongest of the 36 detections recorded within 20 km of this point since 16 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 Warning issued May 18 at 2:52PM EDT until May 18 at 3:30PM EDT by NWS Grand Rapids MI
Nearby, since 16 March 2026
- July 3, 2026 · score 16 · 14.1 km
- September 3, 2026 · score 28 · 17.5 km
- September 5, 2026 · score 32 · 17.6 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 69 % 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 | 69% |
| Coordinates | 41.7240, -85.1684 |
| Nearest City | Goshen (57 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-18T18:52:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.a54c194543daddf8d398ca6c673ae956 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Barry, MI; Calhoun, MI; Kent, MI; Lagrange, IN; Steuben, IN; Branch, MI; Washtenaw, MI; Wayne, MI and 7 more areas |
| Headline | Severe Thunderstorm Warning issued May 18 at 2:52PM EDT until May 18 at 3:30PM EDT by NWS Grand Rapids MI |
| Expires | 2026-05-18T15:30:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | true |
| MergedCount | 10 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a54c194543daddf8d398ca6c673ae95607da9022.001.1","noaa_urn:oid:2.49.0.1.840.0.4a9d626a3a4bb565000d6284685ca04208e1236b.001.1","noaa_urn:oid:2.49.0.1.840.0.495c2b04228b255ca53ab13edf38fcdbc0d8cf3c.001.1","noaa_urn:oid:2.49.0.1.840.0.38761da7832ef64e3a8901fba69260f6b4a44c01.001.1","noaa_urn:oid:2.49.0.1.840.0.626dd85377bab00071fed16773cc79e58187e704.001.1","noaa_urn:oid:2.49.0.1.840.0.19e2101e655139eb9a27b5399aff76b25cf65835.001.1","noaa_urn:oid:2.49.0.1.840.0.d0488e412dd6dd61b3fa985af93ea6413b8fb08d.001.1","noaa_urn:oid:2.49.0.1.840.0.b4ebe0a55278e791b29a6e9e15b7e931af2e4531.002.1","noaa_urn:oid:2.49.0.1.840.0.7696d28f06194ab06c1f788dba2578bb65889278.001.1","noaa_urn:oid:2.49.0.1.840.0.f0910c3eb8526a1d494b09a10f28e117beb48f2a.001.1"] |
| Iem TypeSummary | D |
| Iem City | 4 NE Constantine |
| Iem County | St. Joseph |
| Iem State | MI |
| Iem Wfo | IWX |
| Iem Remark | Emergency Manager reports powerlines and power pole down near Freese Road and Roys Road to the northeast of Constantine in St. Joseph County in Michigan. Time estimated from radar. |
| MergedSources | [{"id":"iem_G_42.230_-85.550_1779128400000","source":"iem","severity":"low","severityValue":25,"timestamp":1779128400000,"latitude":42.23,"longitude":-85.55},{"id":"iem_D_41.880_-85.620_1779125700000","source":"iem","severity":"low","severityValue":25,"timestamp":1779125700000,"latitude":41.88,"longitude":-85.62}] |
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.