This alert expired on 21 May 2026 at 22:45 UTC. It is kept here as a record.
It is the 3rd strongest of the 6 detections recorded within 20 km of this point since 19 May 2026. The last comparable one was on 19 May 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued May 21 at 2:46PM CDT until May 21 at 5:45PM CDT by NWS Norman OK
An estimated 18,310 people live within 50 km of this point.
Nearby, since 19 May 2026
- May 19, 2026 · score 34 · 12.9 km
- June 22, 2026 · score 58 · 17.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 out of 100, at 78 % 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) | 34 / 100 |
| Our confidence | 78% |
| Coordinates | 35.0886, -96.0957 |
| Nearest City | McAlester (35 km) |
| Population Exposed | 18.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-21T19:46:00.000Z |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Hughes, OK |
| Headline | Flash Flood Warning issued May 21 at 2:46PM CDT until May 21 at 5:45PM CDT by NWS Norman OK |
| Expires | 2026-05-21T17:45:00-05:00 |
| SenderName | NWS Norman OK |
| HasExactCoords | true |
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 34/100, near McAlester (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.