This alert expired on 4 June 2026 at 21:00 UTC. It is kept here as a record.
No stronger detection stands among the 78 recorded within 20 km of this point since 15 March 2026 — 21 others scored the same. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 4 at 3:26PM CDT until June 4 at 4:00PM CDT by NWS Wichita KS
An estimated 419,628 people live within 50 km of this point.
Nearby, since 15 March 2026
- June 19, 2026 · score 43 · 1.5 km
- June 18, 2026 · score 43 · 13.4 km
- June 16, 2026 · score 43 · 14.4 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.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 81% |
| Coordinates | 37.3150, -97.4439 |
| Nearest City | Derby (30 km) |
| Population Exposed | 419.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-04T20:26:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.a0f5cc254072958f6621c530353f66b3 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Butler, KS; Sedgwick, KS; Alfalfa, OK; Garfield, OK; Grant, OK |
| Headline | Severe Thunderstorm Warning issued June 4 at 3:26PM CDT until June 4 at 4:00PM CDT by NWS Wichita KS |
| Expires | 2026-06-04T16:00:00-05:00 |
| SenderName | NWS Wichita KS |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a0f5cc254072958f6621c530353f66b34afd6ca3.002.1","noaa_urn:oid:2.49.0.1.840.0.618b04ef777d77b35d8661f3dada9733585f18ae.001.1","noaa_urn:oid:2.49.0.1.840.0.a534ca1ceedcec1698572f3929a2c76184abcf15.001.1"] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
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 43/100, near Derby (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.