This alert expired on 12 June 2026 at 01:00 UTC. It is kept here as a record.
It is the 8th strongest of the 21 detections recorded within 20 km of this point since 15 March 2026. 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 11 at 7:21PM CDT until June 11 at 8:00PM CDT by NWS Norman OK
An estimated 81,122 people live within 50 km of this point.
Nearby, since 15 March 2026
- June 12, 2026 · score 32 · 16.7 km
- May 10, 2026 · score 43 · 21.1 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 32 out of 100, at 79 % 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) | 32 / 100 |
| Our confidence | 79% |
| Coordinates | 35.2110, -98.1580 |
| Nearest City | Chickasha (27 km) |
| Population Exposed | 81.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-12T00:21:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.878e3b3e849cc3d7ef7331d618fc7374 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Grady, OK; Caddo, OK; Kiowa, OK; Washita, OK |
| Headline | Severe Thunderstorm Warning issued June 11 at 7:21PM CDT until June 11 at 8:00PM CDT by NWS Norman OK |
| Expires | 2026-06-11T20:00:00-05:00 |
| SenderName | NWS Norman OK |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.878e3b3e849cc3d7ef7331d618fc7374a35a0a08.001.1","noaa_urn:oid:2.49.0.1.840.0.8b99b4a1996a441c4ff28d8eb90295a879d1eda1.001.1"] |
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 32/100, near Chickasha (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.