This alert expired on 11 August 2026 at 20:30 UTC. It is kept here as a record.
It is the 51st strongest of the 338 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 56 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 11 at 3:41PM EDT until August 11 at 4:30PM EDT by NWS Indianapolis IN
An estimated 1,509,567 people live within 50 km of this point.
Nearby, since 10 March 2026
- August 11, 2026 · score 52 · 6.1 km
- June 10, 2026 · score 46 · 6.8 km
- August 13, 2026 · score 52 · 7.2 km
How we know
Confirmed by 5 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 91 % 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 | 91% |
| Coordinates | 39.7035, -85.9207 |
| Nearest City | Greenfield (16 km) |
| Population Exposed | 1.5M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-11T19:41:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.3c3cc3dd6268e6507a8d7a83da2ca58a |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Fountain, IN; Montgomery, IN; Tippecanoe, IN; Champaign, IL; Vermilion, IL; Brown, IN; Johnson, IN; Monroe, IN; Morgan, IN; Owen, IN and 4 more areas |
| Headline | Severe Thunderstorm Warning issued August 11 at 3:41PM EDT until August 11 at 4:30PM EDT by NWS Indianapolis IN |
| Expires | 2026-08-11T16:30:00-04:00 |
| SenderName | NWS Indianapolis IN |
| HasExactCoords | true |
| MergedCount | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.3c3cc3dd6268e6507a8d7a83da2ca58a3bf963cb.001.1","noaa_urn:oid:2.49.0.1.840.0.006e80f899b00147dfa6ff9e0ab1139d93dd0811.001.1","noaa_urn:oid:2.49.0.1.840.0.37c1f4fccbac5b3ba0fe7e886106b8ff306df27b.001.1","noaa_urn:oid:2.49.0.1.840.0.2b8fb1394db4c4a5d0a3414fee199c08c866372a.001.1","noaa_urn:oid:2.49.0.1.840.0.e6d37ea2e71108e991685843c6929ff1290b5a7d.001.1","noaa_urn:oid:2.49.0.1.840.0.4419746d3af43a5b59282e92f079de5ba1e5f63f.002.1","noaa_urn:oid:2.49.0.1.840.0.6a44188e63392c960422fb79d45b0f9125e5f55d.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 0.25 |
| Iem Unit | Inch |
| Iem City | Greensburg |
| Iem County | Decatur |
| Iem State | IN |
| Iem Wfo | IND |
| Iem Remark | 30-40mph winds. |
| MergedSources | [{"id":"iem_D_39.670_-85.700_1786472700000","source":"iem","severity":"low","severityValue":25,"timestamp":1786472700000,"latitude":39.67,"longitude":-85.7},{"id":"iem_D_39.620_-85.440_1786473180000","source":"iem","severity":"low","severityValue":25,"timestamp":1786473180000,"latitude":39.62,"longitude":-85.44},{"id":"iem_D_39.790_-85.950_1786473060000","source":"iem","severity":"low","severityValue":25,"timestamp":1786473060000,"latitude":39.79,"longitude":-85.95},{"id":"iem_H_39.340_-85.480_1786474740000","source":"iem","severity":"low","severityValue":25,"timestamp":1786474740000,"latitude":39.34,"longitude":-85.48}] |
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 Greenfield?
Calamity.live data shows a weather event with CalamityScore 52/100, near Greenfield (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.