Right now
The most recent data we hold from NOAA arrived 11 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 18 May 2026 at 19:45 UTC. It is kept here as a record.
It is the 6th strongest of the 21 detections recorded within 20 km of this point since 13 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 18 at 3:22PM EDT until May 18 at 3:45PM EDT by NWS Grand Rapids MI
An estimated 33,133 people live within 50 km of this point.
Nearby, since 13 March 2026
- September 5, 2026 · score 16 · 18.4 km
- March 13, 2026 · score 39 · 19.3 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 34 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) | 34 / 100 |
| Our confidence | 89% |
| Coordinates | 42.0049, -84.6641 |
| Nearest City | Jackson (35 km) |
| Population Exposed | 33.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T19:22:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.4e4f9ecb229eb57dac75f7231eea95e5 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Clinton, MI; Eaton, MI; Ingham, MI; Calhoun, MI; Eaton, MI; Ionia, MI; Montcalm, MI; Steuben, IN; Branch, MI; Hillsdale, MI; Defiance, OH; Williams, OH and 5 more areas |
| Headline | Severe Thunderstorm Warning issued May 18 at 3:22PM EDT until May 18 at 3:45PM EDT by NWS Grand Rapids MI |
| Expires | 2026-05-18T15:45:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.4e4f9ecb229eb57dac75f7231eea95e563d0c7ae.002.1","noaa_urn:oid:2.49.0.1.840.0.89a23e03b36f269f827f620605002fb171829dc8.001.1","noaa_urn:oid:2.49.0.1.840.0.0c4ee7661e956abb4424540d847a9eb3739680e2.001.1","noaa_urn:oid:2.49.0.1.840.0.9707f8ccbacb8cc660a43906e9f424d281880f4d.001.1","noaa_urn:oid:2.49.0.1.840.0.35dbfa4b0464d926bb1a3d529c0cb21ca468fee3.001.1","noaa_urn:oid:2.49.0.1.840.0.665decae93f276a3d8f881481ebd02637f77b441.002.1","noaa_urn:oid:2.49.0.1.840.0.b0852a13aac14ba88a8d5436390470bef4de704e.001.1","noaa_urn:oid:2.49.0.1.840.0.520be76a63f26ab59de5cdd3dd19b9879feb5524.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 74 |
| Iem Unit | MPH |
| Iem City | 1 SSW Springfield |
| Iem County | Calhoun |
| Iem State | MI |
| Iem Wfo | GRR |
| Iem Remark | Battle Creek ASOS. |
| MergedSources | [{"id":"iem_D_42.000_-85.330_1779130200000","source":"iem","severity":"low","severityValue":25,"timestamp":1779130200000,"latitude":42,"longitude":-85.33},{"id":"iem_G_42.310_-85.240_1779129840000","source":"iem","severity":"low","severityValue":25,"timestamp":1779129840000,"latitude":42.31,"longitude":-85.24}] |
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 34/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.