Right now
The most recent data we hold from NOAA arrived 2 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 20:30 UTC. It is kept here as a record.
It is the 3rd strongest of the 38 detections recorded within 20 km of this point since 16 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 3:36PM EDT until May 18 at 4:30PM EDT by NWS Detroit/Pontiac MI
An estimated 53,824 people live within 50 km of this point.
Nearby, since 16 March 2026
- August 10, 2026 · score 43 · 18.6 km
- June 17, 2026 · score 37 · 23.7 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 39 out of 100, at 84 % 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) | 39 / 100 |
| Our confidence | 84% |
| Coordinates | 42.0873, -84.3965 |
| Nearest City | Jackson (18 km) |
| Population Exposed | 53.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T19:36:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.a63b2824003e3cae9a86f4cd4c5272b1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Macomb, MI; Clinton, MI; Ingham, MI; Defiance, OH; Paulding, OH and 10 more areas |
| Headline | Severe Thunderstorm Warning issued May 18 at 3:36PM EDT until May 18 at 4:30PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-05-18T16:30:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 13 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a63b2824003e3cae9a86f4cd4c5272b16caf03a9.001.1","noaa_urn:oid:2.49.0.1.840.0.df7f858b1cb7efdd4c90c1911cfaa1685071a8e7.002.1","noaa_urn:oid:2.49.0.1.840.0.fd22478009eebf3e88b63382b4b51cf52916e445.001.1","noaa_urn:oid:2.49.0.1.840.0.d78f8a6c56e3e1ab9f777e0ebdfdece9a9b4f0dc.001.1","noaa_urn:oid:2.49.0.1.840.0.ce76b3581c35ff75adb1e83fa755079d1b19c8e3.001.1","noaa_urn:oid:2.49.0.1.840.0.87d66536b7ae416cfd5cc15e5c2a327634961167.001.1","noaa_urn:oid:2.49.0.1.840.0.c0fb06dfb38d86610d625f6fd4f4b631dcc870b7.001.1","noaa_urn:oid:2.49.0.1.840.0.bd99deb25955faddfb9119110628dc8b44e6be64.001.1","noaa_urn:oid:2.49.0.1.840.0.b7c009277d13b501b3f771b5e5f2d9ba7f2a31dd.001.1","noaa_urn:oid:2.49.0.1.840.0.ed20964195b85aedb1163d6046168fede8140b87.001.1","noaa_urn:oid:2.49.0.1.840.0.18486643277cb504043e62f3d180071afcfbc852.001.1","noaa_urn:oid:2.49.0.1.840.0.520be76a63f26ab59de5cdd3dd19b9879feb5524.001.1","noaa_urn:oid:2.49.0.1.840.0.0c4ee7661e956abb4424540d847a9eb3739680e2.001.1"] |
| 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_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 near Jackson?
Calamity.live data shows a weather event with CalamityScore 39/100, near Jackson (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.