This alert expired on 22 May 2026 at 05:45 UTC. It is kept here as a record.
No stronger detection stands among the 57 recorded within 20 km of this point since 15 March 2026 — 32 others scored the same. The last comparable one was on 21 May 2026. 27 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued May 20 at 12:45PM CDT until May 22 at 8:30PM CDT by NWS St Louis MO
An estimated 173,218 people live within 50 km of this point.
Nearby, since 15 March 2026
- May 21, 2026 · score 43 · 0.8 km
- March 16, 2026 · score 43 · 10.4 km
- March 15, 2026 · score 43 · 10.4 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 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) | 43 / 100 |
| Our confidence | 81% |
| Coordinates | 39.0733, -90.9851 |
| Nearest City | Wentzville (32 km) |
| Population Exposed | 173.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-22T04:17:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flood Warning_noaa_urn:oid:2.49.0.1.840.0.2aabb1f4cf1a0ec5914436becd928561 |
Score Breakdown
Technical Details
| Event | Flood Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Clinton, IL; Daviess, IN; Gibson, IN; Knox, IN; Pike, IN; Gibson, IN; Knox, IN and 39 more areas |
| Headline | Flood Warning issued May 20 at 12:45PM CDT until May 22 at 8:30PM CDT by NWS St Louis MO |
| Expires | 2026-05-22T00:45:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| MergedCount | 46 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.2aabb1f4cf1a0ec5914436becd928561fd4cd4be.001.1","noaa_urn:oid:2.49.0.1.840.0.437920734f5fe5effca345efea95064e0d4e2c32.003.1","noaa_urn:oid:2.49.0.1.840.0.437920734f5fe5effca345efea95064e0d4e2c32.001.1","noaa_urn:oid:2.49.0.1.840.0.437920734f5fe5effca345efea95064e0d4e2c32.005.1","noaa_urn:oid:2.49.0.1.840.0.437920734f5fe5effca345efea95064e0d4e2c32.004.1","noaa_urn:oid:2.49.0.1.840.0.437920734f5fe5effca345efea95064e0d4e2c32.002.1","noaa_urn:oid:2.49.0.1.840.0.437920734f5fe5effca345efea95064e0d4e2c32.006.1","noaa_urn:oid:2.49.0.1.840.0.aac7268dcb11da622ce6c4428f6634b534be94cd.001.1","noaa_urn:oid:2.49.0.1.840.0.f2600d8115763e6e8c0847bc17c191ed3f1698c6.001.1","noaa_urn:oid:2.49.0.1.840.0.b9b5caa5456476ffe2f16fc632f97310a14a1638.001.1","noaa_urn:oid:2.49.0.1.840.0.59030682c609e0ef1eea95bf6f66d418689586bb.002.1","noaa_urn:oid:2.49.0.1.840.0.59030682c609e0ef1eea95bf6f66d418689586bb.003.1","noaa_urn:oid:2.49.0.1.840.0.59030682c609e0ef1eea95bf6f66d418689586bb.005.1","noaa_urn:oid:2.49.0.1.840.0.59030682c609e0ef1eea95bf6f66d418689586bb.001.1","noaa_urn:oid:2.49.0.1.840.0.59030682c609e0ef1eea95bf6f66d418689586bb.004.1","noaa_urn:oid:2.49.0.1.840.0.a7f527bc079e695d0cb6b9d590705a6de97c5d10.004.1","noaa_urn:oid:2.49.0.1.840.0.a7f527bc079e695d0cb6b9d590705a6de97c5d10.005.1","noaa_urn:oid:2.49.0.1.840.0.a7f527bc079e695d0cb6b9d590705a6de97c5d10.002.1","noaa_urn:oid:2.49.0.1.840.0.a7f527bc079e695d0cb6b9d590705a6de97c5d10.003.1","noaa_urn:oid:2.49.0.1.840.0.a7f527bc079e695d0cb6b9d590705a6de97c5d10.001.1","noaa_urn:oid:2.49.0.1.840.0.1fbff4a434ae70f134160050218e065f86cf857a.001.1","noaa_urn:oid:2.49.0.1.840.0.d27e94a437359a5e5d54f0311320eb1bc8af150a.001.1","noaa_urn:oid:2.49.0.1.840.0.bb9a5205a2eb34f619aa6e8852df598eb07a0878.001.1","noaa_urn:oid:2.49.0.1.840.0.285227f5598727227cd2e1dfb4114e27859a4004.001.1","noaa_urn:oid:2.49.0.1.840.0.0cfbe74f43bf96e8434d70bd32597e80978507f9.001.1","noaa_urn:oid:2.49.0.1.840.0.76fd26afe722f8eba68b68124cf5127a744d68db.001.1","noaa_urn:oid:2.49.0.1.840.0.bed9b5b508b2b37416a593decec2d87f36bbc6d3.001.1","noaa_urn:oid:2.49.0.1.840.0.bed9b5b508b2b37416a593decec2d87f36bbc6d3.002.1","noaa_urn:oid:2.49.0.1.840.0.5680dee3e366175c42bbc8efefc4fe8bf0d8f89c.002.1","noaa_urn:oid:2.49.0.1.840.0.5680dee3e366175c42bbc8efefc4fe8bf0d8f89c.001.1","noaa_urn:oid:2.49.0.1.840.0.1d9540202982a04aa904859c8aa08f42af9c451d.001.1","noaa_urn:oid:2.49.0.1.840.0.8ff8bb36d523a7db4c0223a80374170006ba1d78.001.1","noaa_urn:oid:2.49.0.1.840.0.ceb55599647363183fd7f9c98b460d54067cf61d.002.1","noaa_urn:oid:2.49.0.1.840.0.ceb55599647363183fd7f9c98b460d54067cf61d.001.1","noaa_urn:oid:2.49.0.1.840.0.905df4758e94f9fded650802649fc60814adb84c.002.1","noaa_urn:oid:2.49.0.1.840.0.905df4758e94f9fded650802649fc60814adb84c.001.1","noaa_urn:oid:2.49.0.1.840.0.a41c993511d423cc924bcaa39109172301aaf1ca.001.1","noaa_urn:oid:2.49.0.1.840.0.572ea39e15acf4e2c9316b725dee0c5c6f6afa8b.001.1","noaa_urn:oid:2.49.0.1.840.0.361c1ed1fa8fd2969ff31bb1a8512c75b3164c96.001.1","noaa_urn:oid:2.49.0.1.840.0.da02e6c61a7fe2720eda156db8fd5e014c8581c5.001.1","noaa_urn:oid:2.49.0.1.840.0.5b0e469c414a8ce5b3b7a7fc3d95f21c77136ec8.001.1","noaa_urn:oid:2.49.0.1.840.0.bcbb54022a27da1b27c576fc51938b47663e203c.003.1","noaa_urn:oid:2.49.0.1.840.0.bcbb54022a27da1b27c576fc51938b47663e203c.001.1","noaa_urn:oid:2.49.0.1.840.0.bcbb54022a27da1b27c576fc51938b47663e203c.002.1","noaa_urn:oid:2.49.0.1.840.0.bcbb54022a27da1b27c576fc51938b47663e203c.005.1","noaa_urn:oid:2.49.0.1.840.0.bcbb54022a27da1b27c576fc51938b47663e203c.004.1"] |
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 43/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.