This alert expired on 12 August 2026 at 19:15 UTC. It is kept here as a record.
No stronger detection stands among the 177 recorded within 20 km of this point since 12 March 2026 — 25 others scored the same. Another comparable one was recorded here earlier the same day. 25 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 12 at 2:27PM EDT until August 12 at 3:15PM EDT by NWS Indianapolis IN
An estimated 1,102,955 people live within 50 km of this point.
Nearby, since 12 March 2026
- August 11, 2026 · score 52 · 5.4 km
- March 12, 2026 · score 43 · 14.5 km
- August 1, 2026 · score 52 · 15.2 km
How we know
Confirmed by 5 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 90 % 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 | 90% |
| Coordinates | 39.5150, -85.7183 |
| Nearest City | Shelbyville (5 km) |
| Population Exposed | 1.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-12T18:27:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.bbe6587a69051c4bbb67efbd9dadc0493bc6bcfb.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Decatur, IN; Johnson, IN; Rush, IN; Shelby, IN |
| Headline | Severe Thunderstorm Warning issued August 12 at 2:27PM EDT until August 12 at 3:15PM EDT by NWS Indianapolis IN |
| Expires | 2026-08-12T15:15:00-04:00 |
| SenderName | NWS Indianapolis IN |
| HasExactCoords | true |
| Iem TypeSummary | E |
| Iem City | 4 SSE Laurel |
| Iem County | Franklin |
| Iem State | IN |
| Iem Wfo | ILN |
| Iem Remark | Video shows rapidly moving water on Whitewater along Whitewater Canal Trail near Metamora. |
| MergedSources | [{"id":"iem_H_39.220_-85.790_1786542060000","source":"iem","severity":"low","severityValue":25,"timestamp":1786542060000,"latitude":39.22,"longitude":-85.79},{"id":"iem_R_39.420_-85.330_1786543800000","source":"iem","severity":"low","severityValue":25,"timestamp":1786543800000,"latitude":39.42,"longitude":-85.33},{"id":"iem_E_39.420_-85.010_1786538460000","source":"iem","severity":"low","severityValue":25,"timestamp":1786538460000,"latitude":39.42,"longitude":-85.01},{"id":"iem_E_39.450_-85.150_1786551660000","source":"iem","severity":"low","severityValue":25,"timestamp":1786551660000,"latitude":39.45,"longitude":-85.15}] |
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.
Want to know when something happens near Shelbyville?
Calamity.live data shows a weather event with CalamityScore 52/100, near Shelbyville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.