This alert expired on 9 May 2026 at 02:30 UTC. It is kept here as a record.
No stronger detection stands among the 5 recorded within 20 km of this point since 25 April 2026 — one other 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: Tornado Warning issued May 8 at 8:52PM CDT until May 8 at 9:30PM CDT by NWS Norman OK
An estimated 23,231 people live within 50 km of this point.
How we know
Confirmed by 12 independent sources, including NOAA.
Our own score for this event is 58 out of 100, at 90 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | critical |
| Calamity Score (ours) | 58 / 100 |
| Our confidence | 90% |
| Coordinates | 34.4171, -97.7414 |
| Nearest City | Duncan (22 km) |
| Population Exposed | 23.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-09T01:52:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.821d157f5f694b7a330b4aac3f220d3b77c8b0ed.001.1 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Stephens, OK |
| Headline | Tornado Warning issued May 8 at 8:52PM CDT until May 8 at 9:30PM CDT by NWS Norman OK |
| Expires | 2026-05-08T21:30:00-05:00 |
| SenderName | NWS Norman OK |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 1.25 |
| Iem Unit | Inch |
| Iem City | 1 SSE Chickasha |
| Iem County | Grady |
| Iem State | OK |
| Iem Wfo | OUN |
| MergedSources | [{"id":"iem_H_34.340_-97.980_1778292180000","source":"iem","severity":"low","severityValue":25,"timestamp":1778292180000,"latitude":34.34,"longitude":-97.98},{"id":"iem_H_34.350_-97.990_1778291940000","source":"iem","severity":"low","severityValue":25,"timestamp":1778291940000,"latitude":34.35,"longitude":-97.99},{"id":"iem_H_34.950_-97.950_1778285580000","source":"iem","severity":"low","severityValue":25,"timestamp":1778285580000,"latitude":34.95,"longitude":-97.95},{"id":"iem_H_35.030_-97.960_1778284740000","source":"iem","severity":"low","severityValue":25,"timestamp":1778284740000,"latitude":35.03,"longitude":-97.96},{"id":"iem_H_35.040_-97.940_1778285220000","source":"iem","severity":"low","severityValue":25,"timestamp":1778285220000,"latitude":35.04,"longitude":-97.94},{"id":"iem_H_34.950_-97.950_1778285820000","source":"iem","severity":"low","severityValue":25,"timestamp":1778285820000,"latitude":34.95,"longitude":-97.95},{"id":"iem_H_35.020_-97.940_1778285220000","source":"iem","severity":"low","severityValue":25,"timestamp":1778285220000,"latitude":35.02,"longitude":-97.94},{"id":"iem_H_35.030_-97.960_1778284620000","source":"iem","severity":"low","severityValue":25,"timestamp":1778284620000,"latitude":35.03,"longitude":-97.96},{"id":"iem_H_35.030_-97.980_1778285100000","source":"iem","severity":"low","severityValue":25,"timestamp":1778285100000,"latitude":35.03,"longitude":-97.98},{"id":"iem_H_34.780_-98.240_1778288100000","source":"iem","severity":"low","severityValue":25,"timestamp":1778288100000,"latitude":34.78,"longitude":-98.24},{"id":"iem_H_35.030_-97.940_1778285160000","source":"iem","severity":"low","severityValue":25,"timestamp":1778285160000,"latitude":35.03,"longitude":-97.94}] |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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.
Want to know when something happens near Duncan?
Calamity.live data shows a weather event with CalamityScore 58/100, near Duncan (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.