This alert expired on 19 May 2026 at 21:30 UTC. It is kept here as a record.
It is the 2nd strongest of the 45 detections recorded within 20 km of this point since 14 April 2026. Another comparable one was recorded here earlier the same day. 13 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 19 at 4:22PM EDT until May 19 at 5:30PM EDT by NWS Detroit/Pontiac MI
An estimated 2,998,418 people live within 50 km of this point.
Nearby, since 14 April 2026
- May 18, 2026 · score 52 · 1.7 km
- April 14, 2026 · score 52 · 1.7 km
- June 14, 2026 · score 52 · 7.0 km
How we know
Confirmed by 12 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 89 % 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 | 89% |
| Coordinates | 42.4230, -82.8880 |
| Nearest City | Grosse Pointe Woods (3 km) |
| Population Exposed | 3.0M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-19T20:22:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.65c386b5a8f22e66e9f1b60e9e10f2d877423044.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | St. Clair River; Detroit River; Lake St. Clair Open Lake (U.S. Portion) |
| Headline | Special Marine Warning issued May 19 at 4:22PM EDT until May 19 at 5:30PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-05-19T17:30:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 49 |
| Iem Unit | mph |
| Iem City | Oakland County Intl Air |
| Iem County | Oakland |
| Iem State | MI |
| Iem Wfo | DTX |
| Iem Remark | Measured at KPTK Pontiac Airport |
| Google News RssFeed | weather |
| Google News SourceName | The Detroit News |
| MergedSources | [{"id":"iem_D_42.630_-83.370_1779216120000","source":"iem","severity":"low","severityValue":25,"timestamp":1779216120000,"latitude":42.63,"longitude":-83.37},{"id":"iem_D_42.640_-83.460_1779215700000","source":"iem","severity":"low","severityValue":25,"timestamp":1779215700000,"latitude":42.64,"longitude":-83.46},{"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_42.760_-83.020_1779217620000","source":"iem","severity":"low","severityValue":25,"timestamp":1779217620000,"latitude":42.76,"longitude":-83.02},{"id":"iem_G_42.380_-83.370_1779222180000","source":"iem","severity":"low","severityValue":25,"timestamp":1779222180000,"latitude":42.38,"longitude":-83.37},{"id":"iem_D_42.760_-83.020_1779220200000","source":"iem","severity":"low","severityValue":25,"timestamp":1779220200000,"latitude":42.76,"longitude":-83.02},{"id":"iem_H_42.430_-83.180_1779221880000","source":"iem","severity":"low","severityValue":25,"timestamp":1779221880000,"latitude":42.43,"longitude":-83.18},{"id":"iem_D_42.540_-83.620_1779215580000","source":"iem","severity":"low","severityValue":25,"timestamp":1779215580000,"latitude":42.54,"longitude":-83.62},{"id":"iem_G_42.660_-83.410_1779218940000","source":"iem","severity":"low","severityValue":25,"timestamp":1779218940000,"latitude":42.66,"longitude":-83.41},{"id":"gnews_weather_494228_159","source":"google_news","severity":"medium","severityValue":40,"timestamp":1779221100000,"latitude":42.33,"longitude":-83.05}] |
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 Grosse Pointe Woods (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.