This alert expired on 18 May 2026 at 18:15 UTC. It is kept here as a record.
It is the 7th strongest of the 54 detections recorded within 20 km of this point since 31 March 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 1:30PM EDT until May 18 at 2:15PM EDT by NWS Grand Rapids MI
An estimated 171,693 people live within 50 km of this point.
Nearby, since 31 March 2026
- May 18, 2026 · score 43 · 9.0 km
- June 16, 2026 · score 43 · 9.3 km
- July 18, 2026 · score 37 · 13.8 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 90 % 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 | 90% |
| Coordinates | 41.2973, -86.4715 |
| Nearest City | La Porte (40 km) |
| Population Exposed | 171.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T17:30:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.c867a9423a9ea3ffc94072d7c61f8a36 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Allegan, MI; Van Buren, MI; Cass, IN; Fulton, IN; Marshall, IN; Miami, IN; Berrien, MI; Cass, MI and 2 more areas |
| Headline | Severe Thunderstorm Warning issued May 18 at 1:30PM EDT until May 18 at 2:15PM EDT by NWS Grand Rapids MI |
| Expires | 2026-05-18T14:15:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.c867a9423a9ea3ffc94072d7c61f8a36fcd30606.001.1","noaa_urn:oid:2.49.0.1.840.0.a23f9a407111d2ce6293e04441508f55e4f10f72.001.1","noaa_urn:oid:2.49.0.1.840.0.21f4014fbb346fb4b9d0f98a98e8d18032f47976.001.1","noaa_urn:oid:2.49.0.1.840.0.b8f0ce6358a21cdbd619be06cc8444f268de345d.001.1","noaa_urn:oid:2.49.0.1.840.0.aa174bb1ed803a9d120752db80b5e1ee98b34e21.001.1"] |
| Iem TypeSummary | M |
| Iem Magnitude | 62 |
| Iem Unit | MPH |
| Iem City | 4 NE Beverly Shores |
| Iem County | LMZ745 |
| Iem State | IN |
| Iem Wfo | LOT |
| Iem Remark | Michigan City CMAN station reported 54 kt gust. |
| MergedSources | [{"id":"iem_M_41.520_-87.250_1779121260000","source":"iem","severity":"low","severityValue":25,"timestamp":1779121260000,"latitude":41.52,"longitude":-87.25},{"id":"iem_G_41.340_-87.020_1779122400000","source":"iem","severity":"low","severityValue":25,"timestamp":1779122400000,"latitude":41.34,"longitude":-87.02},{"id":"iem_M_41.730_-86.930_1779122640000","source":"iem","severity":"low","severityValue":25,"timestamp":1779122640000,"latitude":41.73,"longitude":-86.93}] |
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 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.