This alert expired on 21 March 2026 at 09:00 UTC. It is kept here as a record.
No stronger detection stands among the 85 recorded within 20 km of this point since 15 March 2026 — 24 others scored the same. The last comparable one was on 16 March 2026. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued March 20 at 1:55PM EDT until March 23 at 9:30PM EDT by NWS Indianapolis IN
An estimated 15,087 people live within 50 km of this point.
Nearby, since 15 March 2026
- May 15, 2026 · score 34 · 0.0 km
- May 14, 2026 · score 34 · 0.0 km
- March 21, 2026 · score 34 · 0.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 out of 100, at 81 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 34 / 100 |
| Our confidence | 81% |
| Coordinates | 38.5225, -88.4690 |
| Nearest City | Mount Vernon (44 km) |
| Population Exposed | 15.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-20T17:55:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flood Warning_noaa_urn:oid:2.49.0.1.840.0.b928ff3988f01ab5ed861b3eeb889580 |
Score Breakdown
Technical Details
| Event | Flood Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Gibson, IN; Knox, IN; Clinton, IL |
| Headline | Flood Warning issued March 20 at 1:55PM EDT until March 23 at 9:30PM EDT by NWS Indianapolis IN |
| Expires | 2026-03-21T05:00:00-04:00 |
| SenderName | NWS Indianapolis IN |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b928ff3988f01ab5ed861b3eeb8895800403e1ad.001.1","noaa_urn:oid:2.49.0.1.840.0.07c4360813907a35f90024ead7daa59252200c3f.001.1"] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 34/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.