Calamity
MediumSevere WeatherCalamity Score: 43

Severe Weather in United States

LincolnUnited StatesNOAA

Right now

The most recent data we hold from NOAA arrived 15 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.

Nothing else has been detected within 20 km in the last 24 hours.

This alert expired on 21 May 2026 at 12:45 UTC. It is kept here as a record.

It is the 4th strongest of the 62 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 19 more were recorded here in the fortnight before it.

What the source measured

NOAA reported: Flood Warning issued May 20 at 8:37PM CDT until May 21 at 7:39AM CDT by NWS Kansas City/Pleasant Hill MO

An estimated 239,012 people live within 50 km of this point.

Nearby, since 15 March 2026

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

TypeSevere Weather
SeverityMedium
Calamity Score (ours)43 / 100
Our confidence81%
Coordinates39.0860, -90.9016
Nearest CityWentzville (31 km)
Population Exposed239.0K within 50 km
Impact Tiersignificant
Timestamp2026-05-21T18:00:00.000Z
Sourcehttps://api.weather.gov/alerts/merged_Flood Warning_noaa_urn:oid:2.49.0.1.840.0.7d669e4712855f26a7980369b868f1cf

Score Breakdown

35
intensity
70
population
0
cascading
80
historical

Technical Details

EventFlood Warning
UrgencyImmediate
CertaintyObserved
AreaDescCooper, MO; Boone, MO; Cooper, MO; Howard, MO; Moniteau, MO; Chariton, MO; Howard, MO; Saline, MO and 34 more areas
HeadlineFlood Warning issued May 20 at 8:37PM CDT until May 21 at 7:39AM CDT by NWS Kansas City/Pleasant Hill MO
Expires2026-05-21T07:45:00-05:00
SenderNameNWS Kansas City/Pleasant Hill MO
HasExactCoordstrue
MergedCount41
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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.

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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.