This alert expired on 18 May 2026 at 19:45 UTC. It is kept here as a record.
No stronger detection stands among the 15 recorded within 20 km of this point since 21 March 2026 — one other scored the same. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 18 at 2:42PM EDT until May 18 at 3:45PM EDT by NWS Detroit/Pontiac MI
An estimated 293,309 people live within 50 km of this point.
Nearby, since 21 March 2026
- September 3, 2026 · score 28 · 13.2 km
- March 21, 2026 · score 39 · 20.2 km
- June 17, 2026 · score 39 · 20.2 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 43 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) | 43 / 100 |
| Our confidence | 89% |
| Coordinates | 41.5235, -85.3454 |
| Nearest City | Goshen (41 km) |
| Population Exposed | 293.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T18:42:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.495c2b04228b255ca53ab13edf38fcdb |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Washtenaw, MI; Wayne, MI; Allen, IN; De Kalb, IN; Noble, IN; Whitley, IN and 7 more areas |
| Headline | Severe Thunderstorm Warning issued May 18 at 2:42PM EDT until May 18 at 3:45PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-05-18T15:45:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 10 |
| MergedIds | ["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","noaa_urn:oid:2.49.0.1.840.0.ade2f0d3d1a4e0a67dd2d1b271cd87d94749202d.001.1","noaa_urn:oid:2.49.0.1.840.0.fd74b1057f9945de6f809d0522d4dba33e9bd0a1.001.1"] |
| Iem TypeSummary | D |
| Iem City | Osceola |
| Iem County | St. Joseph |
| Iem State | IN |
| Iem Wfo | IWX |
| Iem Remark | Media reported a large tree snapped along with other branches near Osceola in St. Joseph County Indiana. Time is radar estimated. |
| MergedSources | [{"id":"iem_D_41.880_-85.620_1779125700000","source":"iem","severity":"low","severityValue":25,"timestamp":1779125700000,"latitude":41.88,"longitude":-85.62},{"id":"iem_D_41.670_-86.080_1779126180000","source":"iem","severity":"low","severityValue":25,"timestamp":1779126180000,"latitude":41.67,"longitude":-86.08}] |
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 43/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.