This alert expired on 18 May 2026 at 20:30 UTC. It is kept here as a record.
No stronger detection stands among the 132 recorded within 20 km of this point since 12 March 2026 — 91 others scored the same. The last comparable one was on 24 April 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 18 at 3:48PM EDT until May 18 at 4:30PM EDT by NWS Indianapolis IN
An estimated 1,503,953 people live within 50 km of this point.
Nearby, since 12 March 2026
- August 14, 2026 · score 52 · 11.1 km
- August 12, 2026 · score 52 · 11.1 km
- August 15, 2026 · score 52 · 11.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 out of 100, at 79 % 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 | 79% |
| Coordinates | 39.8425, -85.7262 |
| Nearest City | Greenfield (7 km) |
| Population Exposed | 1.5M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T19:48:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.95553abfb8460fcf4a1119021eb73c348f61736e.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Delaware, IN; Hancock, IN; Henry, IN; Madison, IN; Rush, IN |
| Headline | Severe Thunderstorm Warning issued May 18 at 3:48PM EDT until May 18 at 4:30PM EDT by NWS Indianapolis IN |
| Expires | 2026-05-18T16:30:00-04:00 |
| SenderName | NWS Indianapolis IN |
| HasExactCoords | true |
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.