Alert archive / Oklahoma / Flash Flood Warnings in 2021
Flash Flood Warning 56, NWS Norman, OK
NWS Norman, OK issued this flash flood warning at Aug 13, 2021, 8:02 PM CDT for Custer County, Washita County, Oklahoma. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 13, 2021, 8:02 PM CDT (01:02 UTC)
- Expired
- Aug 13, 2021, 10:37 PM CDT
- In force
- 3 hr
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Flood severity
- None
Counties Custer County, OK, Washita County, OK
The radar
The Altus AFB radar (KFDR), 126 km from the middle of the area, began a volume at 01:06 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
Amarillo Airport, TX (KAMA), launched 00:00Z, 1.0 hours before the alert went out and 240 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
- 16 J/kg
- Mixed-layer CIN
- -91 J/kg
- Mixed-layer LCL
- 1845 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 8 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
737
WGUS54 KOUN 140102
FFWOUN
OKC039-149-140415-
/O.NEW.KOUN.FF.W.0056.210814T0102Z-210814T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Norman OK
802 PM CDT Fri Aug 13 2021
The National Weather Service in Norman has issued a
* Flash Flood Warning for...
South Central Custer County in western Oklahoma...
North Central Washita County in western Oklahoma...
* Until 1115 PM CDT.
* At 802 PM CDT, doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
1 and 2 inches of rain have fallen. The expected rainfall rate is
2.5 to 3.5 inches in 1 hour. Additional rainfall amounts of 1 to 2
inches are possible in the warned area. Flash flooding is ongoing
or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Clinton, Arapaho, Bessie, Foss and Stafford.
This includes the following highways...
Interstate 40 between mile markers 53 and 69.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 3557 9914 3565 9904 3563 9890 3532 9896
3532 9914 3542 9912 3544 9918
FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL...2.5-3.5 INCHES IN 1 HOUR
$$
031 follow-up statement
507
WGUS74 KOUN 140337
FFSOUN
Flash Flood Statement
National Weather Service Norman OK
1037 PM CDT Fri Aug 13 2021
OKC039-149-140347-
/O.CAN.KOUN.FF.W.0056.000000T0000Z-210814T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Custer OK-Washita OK-
1037 PM CDT Fri Aug 13 2021
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTH CENTRAL CUSTER AND
NORTH CENTRAL WASHITA COUNTIES...
Flood waters have receded. The heavy rain has ended, although light
rainfall will continue. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3557 9914 3565 9904 3563 9890 3532 9896
3532 9914 3542 9912 3544 9918
$$
03The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 7:08 PM CDT | Special Weather Statement | OUN | Custer | 37 min |
| Aug 13, 7:24 PM CDT | Special Weather Statement | OUN | Washita | 36 min |
| Aug 13, 7:27 PM CDT | Severe Thunderstorm Warning | OUN | Custer, Washita | 48 min |
| Aug 13, 7:31 PM CDT | Areal Flood Advisory | OUN | Beckham, Custer, Washita | 3 hr |
| Aug 13, 7:34 PM CDT | Special Weather Statement | OUN | Caddo | 26 min |
| Aug 13, 7:51 PM CDT | Severe Thunderstorm Warning | OUN | Blaine, Caddo, Custer, Kiowa, Washita | 39 min |
| Aug 13, 8:18 PM CDT | Areal Flood Advisory | OUN | Caddo, Custer, Kiowa, Washita | 3 hr |
| Aug 13, 8:24 PM CDT | Special Weather Statement | OUN | Canadian | 51 min |
| Aug 13, 8:34 PM CDT | Special Weather Statement | OUN | Coal | 41 min |
| Aug 13, 8:43 PM CDT | Special Weather Statement | OUN | Caddo, Washita | 47 min |
| Aug 14, 9:20 AM CDT | Areal Flood Advisory | OUN | Bryan, Love, Marshall | 3 hr |
Nearby
Flash Flood Warnings in Oklahoma, 2021Every flash flood warning in 2021
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.