Alert archive / Oklahoma / Flash Flood Warnings in 2021

Flash Flood Warning 41, NWS Norman, OK

July 1, 20214 counties in Oklahoma

NWS Norman, OK issued this flash flood warning at Jul 1, 2021, 2:18 PM CDT for 4 counties in Oklahoma. It was in force for 6 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: Jul 1, 2021, 2:18 PM CDT (19:18 UTC)
Expired: Jul 1, 2021, 8:15 PM CDT
In force: 6 hr
Issued by: NWS Norman, OK
Area: Storm-based polygon
Flood severity: None

Counties Canadian County, OK, Kingfisher County, OK, Logan County, OK, Oklahoma County, OK

The radar

The Norman radar (KTLX), 26 km from the middle of the area, began a volume at 19:20 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, 7.3 hours before the alert went out and 302 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 602 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 1035 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 4 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

267 
WGUS54 KOUN 011918
FFWOUN
OKC017-073-083-109-020115-
/O.NEW.KOUN.FF.W.0041.210701T1918Z-210702T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Norman OK
218 PM CDT Thu Jul 1 2021

The National Weather Service in Norman has issued a

* Flash Flood Warning for...
  Canadian County in central Oklahoma...
  Southern Kingfisher County in central Oklahoma...
  Southern Logan County in central Oklahoma...
  Oklahoma County in central Oklahoma...

* Until 815 PM CDT.

* At 218 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Oklahoma City, Edmond, Midwest City, Del City, El Reno, Yukon, 
  Bethany, Mustang, Choctaw, Warr Acres, The Village, Piedmont, 
  Harrah, Spencer, Nichols Hills, Jones, Nicoma Park, Union City, 
  Luther and Okarche.

This includes the following highways...
	Interstate 35 between mile markers 123 and 150.
	Interstate 44 between mile markers 117 and 151.
	Interstate 40 between mile markers 112 and 163.

Additional rainfall amounts of 1 to 2 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, urban areas, highways, streets and underpasses 
as well as other drainage areas and low lying spots.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, country roads, farmland, and other low lying 
spots.

&&

LAT...LON 3576 9818 3578 9714 3572 9714 3550 9714
      3547 9714 3546 9714 3545 9714 3544 9714
      3543 9714 3540 9714 3540 9818

FLASH FLOOD...RADAR INDICATED

$$

Maxwell

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 1, 8:47 AM CDT	River Flood Advisory	OUN	Blaine, Caddo, Canadian, Custer	37 hr
Jul 1, 12:07 PM CDT	Areal Flood Advisory	OUN	Canadian, Cleveland, Lincoln, Oklahoma, Pottawatomie	3 hr
Jul 1, 12:38 PM CDT	Areal Flood Advisory	OUN	Woods	3 hr
Jul 1, 1:02 PM CDT	Areal Flood Advisory	OUN	Garfield, Grant	3 hr
Jul 1, 1:23 PM CDT	Special Weather Statement	OUN	Pottawatomie	37 min
Jul 1, 1:27 PM CDT	Areal Flood Advisory	OUN	Pottawatomie, Seminole	3 hr
Jul 1, 1:31 PM CDT	Areal Flood Advisory	OUN	Blaine, Canadian, Kingfisher	3 hr
Jul 1, 1:36 PM CDT	Areal Flood Advisory	OUN	Cleveland, McClain, Pottawatomie	3 hr
Jul 1, 1:37 PM CDT	Special Weather Statement	OUN	Canadian	38 min
Jul 1, 2:23 PM CDT	Areal Flood Advisory	OUN	Logan	5 hr
Jul 1, 2:51 PM CDT	Special Weather Statement	OUN	Logan	24 min
Jul 1, 3:34 PM CDT	Flash Flood Warning Considerable damage threat	OUN	Logan	3 hr
Jul 1, 3:42 PM CDT	Special Weather Statement	OUN	Oklahoma	33 min
Jul 1, 3:52 PM CDT	Flash Flood Warning Considerable damage threat	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	3 hr
Jul 1, 4:23 PM CDT	Flash Flood Warning Considerable damage threat	OUN	Caddo, Cleveland, Comanche, Garvin, Grady, McClain	3 hr
Jul 1, 4:50 PM CDT	Areal Flood Advisory	OUN	Lincoln, Pottawatomie	3 hr
Jul 1, 5:39 PM CDT	Areal Flood Advisory	OUN	Stephens	3 hr
Jul 1, 5:43 PM CDT	Areal Flood Advisory	OUN	Garvin, Stephens	3 hr
Jul 1, 5:46 PM CDT	River Flood Advisory	OUN	Lincoln, Oklahoma, Pottawatomie	9 hr

Nearby

Flash Flood Warnings in Oklahoma, 2021 Every 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.