This alert expired on 19 June 2026 at 15:30 UTC. It is kept here as a record.
No stronger detection stands among the 31 recorded within 20 km of this point since 27 March 2026 — 11 others scored the same. Another comparable one was recorded here earlier the same day. 17 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued June 19 at 7:20AM CDT until June 19 at 10:30AM CDT by NWS Norman OK
An estimated 119,886 people live within 50 km of this point.
Nearby, since 27 March 2026
- May 23, 2026 · score 43 · 10.7 km
- June 12, 2026 · score 37 · 14.8 km
- June 12, 2026 · score 37 · 16.0 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 43 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 | medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 90% |
| Coordinates | 34.3885, -98.2062 |
| Nearest City | Duncan (26 km) |
| Population Exposed | 119.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-19T12:20:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.db69e810191fb6a0b5d3b5e8850b78c7 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Stephens, OK; Cotton, OK; Jefferson, OK; Stephens, OK; Comanche, OK and 1 more areas |
| Headline | Flash Flood Warning issued June 19 at 7:20AM CDT until June 19 at 10:30AM CDT by NWS Norman OK |
| Expires | 2026-06-19T10:30:00-05:00 |
| SenderName | NWS Norman OK |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.db69e810191fb6a0b5d3b5e8850b78c7d5255218.001.1","noaa_urn:oid:2.49.0.1.840.0.b7b062f29490d2693088ae7900be377ef4f9c43e.001.1","noaa_urn:oid:2.49.0.1.840.0.3d68ac8f253f53b5b0c7b2ff168fb579f816371b.001.1","noaa_urn:oid:2.49.0.1.840.0.73ae5230a2ed43109d30e674b79080329b2b300c.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 67 |
| Iem Unit | MPH |
| Iem City | 1 NE Sheppard Afb |
| Iem County | Wichita |
| Iem State | TX |
| Iem Wfo | OUN |
| MergedSources | [{"id":"iem_G_34.350_-98.990_1781861160000","source":"iem","severity":"low","severityValue":25,"timestamp":1781861160000,"latitude":34.35,"longitude":-98.99},{"id":"iem_G_33.980_-98.500_1781862840000","source":"iem","severity":"low","severityValue":25,"timestamp":1781862840000,"latitude":33.98,"longitude":-98.5}] |
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.
Want to know when something happens near Duncan?
Calamity.live data shows a weather event with CalamityScore 43/100, near Duncan (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.