Calamity
MediumSevere WeatherCalamity Score: 46

Severe Weather near Shelby

MacombUnited StatesNOAA

This alert expired on 3 September 2026 at 16:30 UTC. It is kept here as a record.

It is the 21st strongest of the 54 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 11:23AM EDT until September 3 at 12:30PM EDT by NWS Detroit/Pontiac MI

An estimated 2,640,320 people live within 50 km of this point.

Nearby, since 4 April 2026

How we know

Confirmed by 2 independent sources, including NOAA.

Our own score for this event is 46 out of 100, at 87 % 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

TypeSevere Weather
SeverityMedium
Calamity Score (ours)46 / 100
Our confidence87%
Coordinates42.7001, -82.9951
Nearest CityShelby (4 km)
Population Exposed2.6M within 50 km
Impact Tiersignificant
Timestamp2026-09-03T15:23:00.000Z
Sourcehttps://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.4237d0fdddb442ce667b60dd59662d75ffee5673.001.1

Score Breakdown

35
intensity
100
population
0
cascading
18
historical

Technical Details

EventSevere Thunderstorm Warning
UrgencyImmediate
CertaintyObserved
AreaDescMacomb, MI; St. Clair, MI; Oakland, MI
HeadlineSevere Thunderstorm Warning issued September 3 at 11:23AM EDT until September 3 at 12:30PM EDT by NWS Detroit/Pontiac MI
Expires2026-09-03T12:30:00-04:00
SenderNameNWS Detroit/Pontiac MI
HasExactCoordstrue
MergedCount2
MergedIds["noaa_urn:oid:2.49.0.1.840.0.4237d0fdddb442ce667b60dd59662d75ffee5673.001.1","noaa_urn:oid:2.49.0.1.840.0.c8bfc0d8d9db9269ae79754e63e5cea701e3acc1.001.1"]
Iem TypeSummaryR
Iem Magnitude1.44
Iem UnitInch
Iem City2 NE Birmingham
Iem CountyOakland
Iem StateMI
Iem WfoDTX
Iem RemarkCocorahs station MI-OK-190 Troy 3.0 WSW. The period of the Rain event was 24 hours.
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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.

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Calamity.live data shows a weather event with CalamityScore 46/100, near Shelby (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.