This alert expired on 12 August 2026 at 00:30 UTC. It is kept here as a record.
It is the 3rd strongest of the 232 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 21 July 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 11 at 7:57PM EDT until August 11 at 8:30PM EDT by NWS Louisville KY
An estimated 924,632 people live within 50 km of this point.
Nearby, since 15 March 2026
- August 12, 2026 · score 48 · 3.4 km
- April 28, 2026 · score 48 · 4.7 km
- May 16, 2026 · score 48 · 5.5 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 48 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) | 48 / 100 |
| Our confidence | 90% |
| Coordinates | 38.3102, -85.7621 |
| Nearest City | Clarksville (1 km) |
| Population Exposed | 924.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-11T23:57:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.adffeccde61ee1401ddcef5266226a14 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Floyd, IN; Harrison, IN; Bullitt, KY; Hardin, KY; Jefferson, KY; Meade, KY; Dearborn, IN; Ohio, IN; Switzerland, IN; Boone, KY; Carroll, KY; Gallatin, KY; Grant, KY; Kenton, KY; Owen, KY; Pendleton, KY; Crawford, IN; Harrison, IN; Perry, IN; Breckinridge, KY; Meade, KY |
| Headline | Severe Thunderstorm Warning issued August 11 at 7:57PM EDT until August 11 at 8:30PM EDT by NWS Louisville KY |
| Expires | 2026-08-11T20:30:00-04:00 |
| SenderName | NWS Louisville KY |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.adffeccde61ee1401ddcef5266226a14de0f3cec.001.1","noaa_urn:oid:2.49.0.1.840.0.a56bfd957f98dac583ad9cd548a4c5665f5a1167.001.1","noaa_urn:oid:2.49.0.1.840.0.dc145d1222e383bdbb4324545f806eccd3d7feeb.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 3 S Salem |
| Iem County | Washington |
| Iem State | IN |
| Iem Wfo | LMK |
| MergedSources | [{"id":"iem_H_38.520_-86.350_1786490700000","source":"iem","severity":"low","severityValue":25,"timestamp":1786490700000,"latitude":38.52,"longitude":-86.35},{"id":"iem_H_38.560_-86.100_1786488600000","source":"iem","severity":"low","severityValue":25,"timestamp":1786488600000,"latitude":38.56,"longitude":-86.1}] |
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 Clarksville?
Calamity.live data shows a weather event with CalamityScore 48/100, near Clarksville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.