This alert expired on 3 September 2026 at 16:30 UTC. It is kept here as a record.
It is the 29th strongest of the 75 detections recorded within 20 km of this point since 4 April 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 3 at 12:19PM EDT until September 3 at 12:30PM EDT by NWS Detroit/Pontiac MI
An estimated 2,977,248 people live within 50 km of this point.
Nearby, since 4 April 2026
- May 18, 2026 · score 52 · 5.4 km
- May 19, 2026 · score 52 · 7.6 km
- May 19, 2026 · score 52 · 8.9 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 46 out of 100, at 86 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 46 / 100 |
| Our confidence | 86% |
| Coordinates | 42.6153, -83.0059 |
| Nearest City | Sterling Heights (4 km) |
| Population Exposed | 3.0M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-03T16:19:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.7bd63a9166c3a4e39736b955d57ff6aae93eef5c.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Macomb, MI; St. Clair, MI; Oakland, MI |
| Headline | Severe Thunderstorm Warning issued September 3 at 12:19PM EDT until September 3 at 12:30PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-09-03T12:30:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7bd63a9166c3a4e39736b955d57ff6aae93eef5c.001.1","noaa_urn:oid:2.49.0.1.840.0.436e895f2d38329ec5bd7a8c34689abbd4938a92.001.1"] |
| Iem TypeSummary | R |
| Iem Magnitude | 1.44 |
| Iem Unit | Inch |
| Iem City | 2 NE Birmingham |
| Iem County | Oakland |
| Iem State | MI |
| Iem Wfo | DTX |
| Iem Remark | Cocorahs station MI-OK-190 Troy 3.0 WSW. The period of the Rain event was 24 hours. |
| MergedSources | [{"id":"iem_R_42.540_-83.520_1788435720000","source":"iem","severity":"low","severityValue":25,"timestamp":1788435720000,"latitude":42.54,"longitude":-83.52},{"id":"iem_R_42.610_-83.530_1788433200000","source":"iem","severity":"low","severityValue":25,"timestamp":1788433200000,"latitude":42.61,"longitude":-83.53},{"id":"iem_D_42.800_-83.620_1788447180000","source":"iem","severity":"low","severityValue":25,"timestamp":1788447180000,"latitude":42.8,"longitude":-83.62},{"id":"iem_R_42.580_-83.850_1788433200000","source":"iem","severity":"low","severityValue":25,"timestamp":1788433200000,"latitude":42.58,"longitude":-83.85},{"id":"iem_D_42.690_-83.120_1788449220000","source":"iem","severity":"low","severityValue":25,"timestamp":1788449220000,"latitude":42.69,"longitude":-83.12},{"id":"iem_R_42.580_-83.140_1788432540000","source":"iem","severity":"low","severityValue":25,"timestamp":1788432540000,"latitude":42.58,"longitude":-83.14},{"id":"iem_R_42.570_-83.450_1788433200000","source":"iem","severity":"low","severityValue":25,"timestamp":1788433200000,"latitude":42.57,"longitude":-83.45},{"id":"iem_D_42.740_-83.620_1788447480000","source":"iem","severity":"low","severityValue":25,"timestamp":1788447480000,"latitude":42.74,"longitude":-83.62},{"id":"iem_D_42.750_-83.380_1788448260000","source":"iem","severity":"low","severityValue":25,"timestamp":1788448260000,"latitude":42.75,"longitude":-83.38},{"id":"iem_R_42.460_-83.400_1788433200000","source":"iem","severity":"low","severityValue":25,"timestamp":1788433200000,"latitude":42.46,"longitude":-83.4},{"id":"iem_R_42.450_-83.360_1788433200000","source":"iem","severity":"low","severityValue":25,"timestamp":1788433200000,"latitude":42.45,"longitude":-83.36},{"id":"iem_R_42.520_-83.220_1788436800000","source":"iem","severity":"low","severityValue":25,"timestamp":1788436800000,"latitude":42.52,"longitude":-83.22},{"id":"iem_R_42.420_-83.340_1788433200000","source":"iem","severity":"low","severityValue":25,"timestamp":1788433200000,"latitude":42.42,"longitude":-83.34},{"id":"iem_D_42.770_-83.310_1788449220000","source":"iem","severity":"low","severityValue":25,"timestamp":1788449220000,"latitude":42.77,"longitude":-83.31},{"id":"iem_R_42.500_-83.050_1788434100000","source":"iem","severity":"low","severityValue":25,"timestamp":1788434100000,"latitude":42.5,"longitude":-83.05},{"id":"iem_R_42.360_-82.930_1788433200000","source":"iem","severity":"low","severityValue":25,"timestamp":1788433200000,"latitude":42.36,"longitude":-82.93},{"id":"iem_R_42.580_-83.250_1788433200000","source":"iem","severity":"low","severityValue":25,"timestamp":1788433200000,"latitude":42.58,"longitude":-83.25},{"id":"iem_R_42.450_-82.960_1788432300000","source":"iem","severity":"low","severityValue":25,"timestamp":1788432300000,"latitude":42.45,"longitude":-82.96},{"id":"iem_R_42.470_-83.370_1788435000000","source":"iem","severity":"low","severityValue":25,"timestamp":1788435000000,"latitude":42.47,"longitude":-83.37},{"id":"iem_R_42.530_-83.150_1788431700000","source":"iem","severity":"low","severityValue":25,"timestamp":1788431700000,"latitude":42.53,"longitude":-83.15},{"id":"iem_R_42.650_-83.400_1788433200000","source":"iem","severity":"low","severityValue":25,"timestamp":1788433200000,"latitude":42.65,"longitude":-83.4},{"id":"iem_R_42.430_-83.380_1788435900000","source":"iem","severity":"low","severityValue":25,"timestamp":1788435900000,"latitude":42.43,"longitude":-83.38},{"id":"iem_R_42.560_-83.200_1788433200000","source":"iem","severity":"low","severityValue":25,"timestamp":1788433200000,"latitude":42.56,"longitude":-83.2}] |
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 Sterling Heights?
Calamity.live data shows a weather event with CalamityScore 46/100, near Sterling Heights (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.