Alert archive / Oklahoma / Flash Flood Warnings in 2021

Flash Flood Warning 59, NWS Norman, OK

September 28, 2021Comanche County, Oklahoma

NWS Norman, OK issued this flash flood warning at Sep 28, 2021, 8:39 PM CDT for Comanche County, Oklahoma. It was in force for 3 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Sep 28, 2021, 8:39 PM CDT (01:39 UTC)
Expired: Sep 28, 2021, 11:45 PM CDT
In force: 3 hr
Issued by: NWS Norman, OK
Area: Storm-based polygon
Flood severity: None

County Comanche County, OK

The radar

The Altus AFB radar (KFDR), 58 km from the middle of the area, began a volume at 01:42 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.

What was reported inside it

Time	Report	Where	Remark
Sep 28, 8:40 PM CDT	FLASH FLOOD	1 W Lawton, OK	SEVERAL HIGH WATER RESCUES WERE REPORTED DUE TO CARS STRANDED IN HIGH WATER.
Sep 28, 8:45 PM CDT	FLASH FLOOD	3 Wsw Lawton, OK	REPORT FROM MPING: STREET/ROAD FLOODING; STREET/ROAD CLOSED; VEHICLES STRANDED ACROSS CITY OF LAWTON.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 1.7 hours before the alert went out and 114 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: 1179 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 2021 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -26 m²/s²
0-3 km storm-relative helicity: 12 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

574 
WGUS54 KOUN 290139
FFWOUN
OKC031-290445-
/O.NEW.KOUN.FF.W.0059.210929T0139Z-210929T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Norman OK
839 PM CDT Tue Sep 28 2021

The National Weather Service in Norman has issued a

* Flash Flood Warning for...
  Central Comanche County in southwestern Oklahoma...

* Until 1145 PM CDT.

* At 839 PM 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...
  Lawton and southeastern Fort Sill.

This includes the following highways...
	Interstate 44 between mile markers 35 and 43.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3468 9849 3469 9835 3457 9834 3456 9849

FLASH FLOOD...RADAR INDICATED

$$

Zwink

1 follow-up statement

744 
WGUS74 KOUN 290259
FFSOUN

Flash Flood Statement
National Weather Service Norman OK
959 PM CDT Tue Sep 28 2021

OKC031-290445-
/O.CON.KOUN.FF.W.0059.000000T0000Z-210929T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Comanche OK-
959 PM CDT Tue Sep 28 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT THIS 
EVENING FOR CENTRAL COMANCHE COUNTY...

At 959 PM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2 and 4 inches of rain have 
fallen. Additional rainfall amounts up to 1 inch 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...
  Lawton and southeastern Fort Sill.

This includes the following highways...
	Interstate 44 between mile markers 35 and 43.

Although major rainfall has ended, areas of flooding may still be 
ongoing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3468 9849 3469 9835 3457 9834 3456 9849

FLASH FLOOD...RADAR INDICATED

$$

Zwink

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 28, 7:09 PM CDT	Special Weather Statement	OUN	Comanche	36 min
Sep 28, 7:18 PM CDT	Special Weather Statement	OUN	Tillman	27 min
Sep 28, 7:31 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Kiowa, Tillman	44 min
Sep 28, 7:44 PM CDT	Special Weather Statement	OUN	Caddo	46 min
Sep 28, 8:13 PM CDT	Special Weather Statement	OUN	Comanche	32 min
Sep 28, 8:20 PM CDT	Areal Flood Advisory	OUN	Comanche	2 hr
Sep 28, 9:56 PM CDT	Areal Flood Advisory	OUN	Love	2 hr
Sep 28, 10:30 PM CDT	Special Weather Statement	OUN	Marshall	45 min
Sep 29, 5:10 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	50 min
Sep 29, 5:50 PM CDT	Special Weather Statement	OUN	Woodward	25 min
Sep 29, 6:13 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woodward	34 min
Sep 29, 6:42 PM CDT	Special Weather Statement	OUN	Woods	33 min
Sep 29, 6:51 PM CDT	Severe Thunderstorm Warning	OUN	Woods	39 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.