This alert expired on 19 May 2026 at 19:45 UTC. It is kept here as a record.
No stronger detection stands among the 55 recorded within 20 km of this point since 13 March 2026 — 30 others scored the same. Another comparable one was recorded here earlier the same day. 22 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 19 at 3:20PM EDT until May 19 at 3:45PM EDT by NWS Detroit/Pontiac MI
An estimated 3,064,073 people live within 50 km of this point.
Nearby, since 13 March 2026
- May 19, 2026 · score 52 · 9.7 km
- June 11, 2026 · score 46 · 10.4 km
- May 19, 2026 · score 52 · 10.9 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 91 % 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) | 52 / 100 |
| Our confidence | 91% |
| Coordinates | 42.6420, -83.1474 |
| Nearest City | Rochester Hills (2 km) |
| Population Exposed | 3.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-19T19:20:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.75ed0c8461ac172fd1805523dac9ea60 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Livingston, MI; St. Clair, MI; Oakland, MI and 1 more areas |
| Headline | Severe Thunderstorm Warning issued May 19 at 3:20PM EDT until May 19 at 3:45PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-05-19T15:45:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.75ed0c8461ac172fd1805523dac9ea60ca771578.001.1","noaa_urn:oid:2.49.0.1.840.0.1a32612bfe8a9e0c2b3b7e9c3e421b4bfa15f900.001.1","noaa_urn:oid:2.49.0.1.840.0.b5b700d5345b64c9686744bac4339dea3dcd96b7.001.1","noaa_urn:oid:2.49.0.1.840.0.cdc67c292997c6a8617a01df401905768614a2ea.001.1"] |
| Iem TypeSummary | D |
| Iem City | 2 N New Hudson |
| Iem County | Oakland |
| Iem State | MI |
| Iem Wfo | DTX |
| Iem Remark | Observed downed tree and large tree limbs. |
| MergedSources | [{"id":"iem_D_42.530_-83.630_1779215520000","source":"iem","severity":"low","severityValue":25,"timestamp":1779215520000,"latitude":42.53,"longitude":-83.63},{"id":"iem_G_42.680_-83.190_1779216900000","source":"iem","severity":"low","severityValue":25,"timestamp":1779216900000,"latitude":42.68,"longitude":-83.19},{"id":"iem_D_42.540_-83.620_1779215580000","source":"iem","severity":"low","severityValue":25,"timestamp":1779215580000,"latitude":42.54,"longitude":-83.62}] |
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 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 52/100, near Rochester Hills (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.