Right now
The most recent data we hold from NOAA arrived 4 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 19 May 2026 at 20:30 UTC. It is kept here as a record.
No stronger detection stands among the 90 recorded within 20 km of this point since 13 March 2026 — 28 others scored the same. Another comparable one was recorded here earlier the same day. 21 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 19 at 3:14PM EDT until May 19 at 4:30PM EDT by NWS Detroit/Pontiac MI
Urban PEI: 3,064,073 within a heuristic 50 km radius; not unique people.
Nearby, since 13 March 2026
- May 19, 2026 · score 52 · 0.9 km
- September 4, 2026 · score 46 · 5.1 km
- September 3, 2026 · score 46 · 5.1 km
How we know
4 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 52 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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) | 52 / 100 |
| Legacy data-support index | 0.91/1 |
| Coordinates | 42.6499, -83.1500 |
| Nearest City | Rochester Hills (1 km) |
| Urban exposure index (PEI) | 3.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-19T19:14:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.1a32612bfe8a9e0c2b3b7e9c3e421b4b |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-05-19T19:14:00.000Z.
First archived: 2026-05-19T19:17:00.088Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | St. Clair, MI; Oakland, MI; Macomb, MI and 1 more areas |
| Headline | Severe Thunderstorm Warning issued May 19 at 3:14PM EDT until May 19 at 4:30PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-05-19T16:30:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["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","noaa_urn:oid:2.49.0.1.840.0.735a40abc15ae714cd4fbf5343ed3886a5a113c1.002.1"] |
| 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 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.
Review the area, threshold and delivery channel in your account.
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