Right now
The most recent data we hold from NOAA arrived 41 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 June 2026 at 13:30 UTC. It is kept here as a record.
It is the 6th strongest of the 140 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 9 June 2026. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued June 21 at 4:42AM CDT until June 21 at 8:30AM CDT by NWS Kansas City/Pleasant Hill MO
Urban PEI: 219,880 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- June 21, 2026 · score 43 · 0.0 km
- June 8, 2026 · score 43 · 12.6 km
- September 15, 2026 · score 37 · 17.4 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 43 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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 |
| Legacy data-support index | 0.85/1 |
| Coordinates | 39.0356, -95.4347 |
| Nearest City | Lawrence (18 km) |
| Urban exposure index (PEI) | 219.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-21T09:42:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.af1bb66002b7d24fb4f20b8976af8e99 |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-06-21T09:42:00.000Z.
First archived: 2026-06-21T10:56:32.637Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Johnson, KS; Leavenworth, KS; Wyandotte, KS; Clay, MO; Platte, MO; Jackson, KS; Jefferson, KS; Osage, KS; Pottawatomie, KS; Shawnee, KS; Wabaunsee, KS |
| Headline | Flash Flood Warning issued June 21 at 4:42AM CDT until June 21 at 8:30AM CDT by NWS Kansas City/Pleasant Hill MO |
| Expires | 2026-06-21T08:30:00-05:00 |
| SenderName | NWS Kansas City/Pleasant Hill MO |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.af1bb66002b7d24fb4f20b8976af8e9986a73aad.001.1","noaa_urn:oid:2.49.0.1.840.0.cf483375bc18f93cc5f43a4d4b217e58050099b4.001.1"] |
| Google News RssFeed | weather |
| Google News SourceName | KMBC |
| MergedSources | [{"id":"gnews_weather_495005_80","source":"google_news","severity":"medium","severityValue":40,"timestamp":1782019200000,"latitude":39.1,"longitude":-94.58}] |
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.
Review the area, threshold and delivery channel in your account.
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