Right now
The most recent data we hold from NOAA arrived 3 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
This alert expired on 19 May 2026 at 20:30 UTC. It is kept here as a record.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 19 at 3:33PM EDT until May 19 at 4:30PM EDT by NWS Detroit/Pontiac MI
Urban PEI: 3,242,885 within a heuristic 50 km radius; not unique people.
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 | 0.90/1 |
| Coordinates | 42.5504, -83.2864 |
| Nearest City | Birmingham (6 km) |
| Urban exposure index (PEI) | 3.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-19T19:33:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.e836e80e6cb8ac4f4ff317e6c9a071a3 |
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: 2026-05-19T19:33:00.000Z.
First archived: 2026-05-19T19:37:33.575Z. 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; Macomb, MI; Washtenaw, MI and 1 more areas |
| Headline | Severe Thunderstorm Warning issued May 19 at 3:33PM 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.e836e80e6cb8ac4f4ff317e6c9a071a34a0e778d.001.1","noaa_urn:oid:2.49.0.1.840.0.5951c43275d769ed4d0719102beabce6046ba57c.001.1","noaa_urn:oid:2.49.0.1.840.0.61b43c1ce69c125acceb25c617bd77a00a8f5d1e.001.1","noaa_urn:oid:2.49.0.1.840.0.75ed0c8461ac172fd1805523dac9ea60ca771578.001.1"] |
| 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 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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