This alert expired on 10 August 2026 at 16:00 UTC. It is kept here as a record.
No stronger detection stands among the 120 recorded within 20 km of this point since 15 March 2026 — 19 others scored the same. Another comparable one was recorded here earlier the same day. 23 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued August 10 at 6:21AM CDT until August 10 at 11:00AM CDT by NWS Kansas City/Pleasant Hill MO
An estimated 1,740,140 people live within 50 km of this point.
Nearby, since 15 March 2026
- August 6, 2026 · score 46 · 2.4 km
- August 10, 2026 · score 52 · 9.2 km
- June 9, 2026 · score 52 · 16.2 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 86 % 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 | 86% |
| Coordinates | 38.8075, -94.7037 |
| Nearest City | Olathe (13 km) |
| Population Exposed | 1.7M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-10T11:21:00.000Z |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Johnson, KS |
| Headline | Flash Flood Warning issued August 10 at 6:21AM CDT until August 10 at 11:00AM CDT by NWS Kansas City/Pleasant Hill MO |
| Expires | 2026-08-10T11:00:00-05:00 |
| SenderName | NWS Kansas City/Pleasant Hill MO |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 58 |
| Iem Unit | MPH |
| Iem City | 1 WNW Clare |
| Iem County | Johnson |
| Iem State | KS |
| Iem Wfo | EAX |
| MergedSources | [{"id":"iem_G_38.830_-94.890_1786352520000","source":"iem","severity":"low","severityValue":25,"timestamp":1786352520000,"latitude":38.83,"longitude":-94.89}] |
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 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.
Calamity.live data shows a weather event with CalamityScore 52/100, near Olathe (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.