Alert archive / Oklahoma / Flash Flood Warnings in 2021
Flash Flood Warning 57, NWS Norman, OK
NWS Norman, OK issued this flash flood warning at Aug 16, 2021, 9:23 AM CDT for Harper 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 16, 2021, 9:23 AM CDT (14:23 UTC)
- Expired
- Aug 16, 2021, 12:30 PM CDT
- In force
- 3 hr
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Flood severity
- None
County Harper County, OK
The radar
The Dodge City radar (KDDC), 123 km from the middle of the area, began a volume at 14:25 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
Dodge City, (KDDC), launched 12:00Z, 2.4 hours before the alert went out and 124 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
- 360 J/kg
- Mixed-layer CIN
- -169 J/kg
- Mixed-layer LCL
- 970 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 131 m²/s²
- 0-3 km storm-relative helicity
- 182 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
The text
As transmitted.
347
WGUS54 KOUN 161423
FFWOUN
OKC059-161730-
/O.NEW.KOUN.FF.W.0057.210816T1423Z-210816T1730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Norman OK
923 AM CDT Mon Aug 16 2021
The National Weather Service in Norman has issued a
* Flash Flood Warning for...
Southwestern Harper County in northwestern Oklahoma...
* Until 1230 PM CDT.
* At 923 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 4 inches of rain
have fallen. 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.
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...
Laverne.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3674 10000 3674 9990 3659 9989 3659 9994
3659 10000 3661 10000 3664 10000 3669 10000
FLASH FLOOD...RADAR INDICATED
$$
30The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 6:22 AM CDT | Special Weather Statement | OUN | Ellis | 23 min |
| Aug 16, 6:49 AM CDT | Special Weather Statement | OUN | Ellis | 26 min |
| Aug 16, 8:36 AM CDT | Special Weather Statement | OUN | Harper | 24 min |
| Aug 16, 8:45 AM CDT | Areal Flood Advisory | OUN | Harper | 3 hr |
| Aug 16, 4:28 PM CDT | Special Weather Statement | OUN | Noble | 47 min |
| Aug 16, 4:30 PM CDT | Special Weather Statement | OUN | Washita | 45 min |
| Aug 16, 6:36 PM CDT | Special Weather Statement | OUN | Oklahoma | 24 min |
| Aug 16, 6:43 PM CDT | Special Weather Statement | OUN | Payne | 32 min |
| Aug 16, 6:50 PM CDT | Severe Thunderstorm Warning | OUN | Canadian, Cleveland, Oklahoma | 40 min |
| Aug 16, 6:55 PM CDT | Areal Flood Advisory | OUN | Oklahoma | 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.