Alert archive / Oklahoma / Flash Flood Warnings in 2026
Flash Flood Warning 31, NWS Norman, OK
NWS Norman, OK issued this flash flood warning at May 21, 2026, 2:52 PM CDT for Cotton County, Jefferson County, Oklahoma; Clay County, Texas. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 21, 2026, 2:52 PM CDT (19:52 UTC)
- Expired
- May 21, 2026, 5:15 PM CDT
- In force
- 2 hr
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Flood severity
- None
Counties Cotton County, OK, Jefferson County, OK, Clay County, TX
The radar
The Altus AFB radar (KFDR), 84 km from the middle of the area, began a volume at 19:54 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Fort Worth, TX (KFWD), launched 12:00Z, 7.9 hours before the alert went out and 158 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 826 J/kg
- Mixed-layer CIN
- -34 J/kg
- Mixed-layer LCL
- 631 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 101 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 7:38 AM CDT | Areal Flood Advisory | OUN | Canadian, Grady | 3 hr |
| May 21, 10:45 AM CDT | Areal Flood Advisory | OUN | Oklahoma | 3 hr |
| May 21, 1:08 PM CDT | Areal Flood Advisory | OUN | Cotton, Jefferson | 104 min |
| May 21, 2:39 PM CDT | Areal Flood Advisory | OUN | Kiowa | 3 hr |
| May 21, 2:46 PM CDT | Flash Flood Warning | OUN | Hughes | 3 hr |
| May 21, 3:15 PM CDT | Special Weather Statement | OUN | Jefferson | 30 min |
| May 21, 4:38 PM CDT | Areal Flood Advisory | OUN | Logan | 3 hr |
| May 21, 5:07 PM CDT | Areal Flood Advisory | OUN | Comanche, Jackson, Kiowa, Tillman | 3 hr |
| May 21, 6:06 PM CDT | Areal Flood Advisory | OUN | Payne | 114 min |
Nearby
Flash Flood Warnings in Oklahoma, 2026Flash Flood Warnings in Texas, 2026Every flash flood warning in 2026
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.