Alert archive / Oklahoma / Flash Flood Warnings in 2021

Flash Flood Warning 60, NWS Norman, OK

September 30, 2021Canadian County, Kingfisher County, Oklahoma County, Oklahoma

NWS Norman, OK issued this flash flood warning at Sep 30, 2021, 10:03 AM CDT for Canadian County, Kingfisher County, Oklahoma 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: Sep 30, 2021, 10:03 AM CDT (15:03 UTC)
Expired: Sep 30, 2021, 1:00 PM CDT
In force: 3 hr
Issued by: NWS Norman, OK
Area: Storm-based polygon
Flood severity: None

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

The radar

The Norman radar (KTLX), 63 km from the middle of the area, began a volume at 15:03 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

Norman, OK (KOUN), launched 12:00Z, 3.1 hours before the alert went out and 63 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: 961 J/kg
Mixed-layer CIN: -148 J/kg
Mixed-layer LCL: 945 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 75 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

521 
WGUS54 KOUN 301503
FFWOUN
OKC017-073-109-301800-
/O.NEW.KOUN.FF.W.0060.210930T1503Z-210930T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Norman OK
1003 AM CDT Thu Sep 30 2021

The National Weather Service in Norman has issued a

* Flash Flood Warning for...
  Eastern Canadian County in central Oklahoma...
  Southeastern Kingfisher County in central Oklahoma...
  Northwestern Oklahoma County in central Oklahoma...

* Until 100 PM CDT.

* At 1003 AM CDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  2 and 4 inches of rain have fallen. The expected rainfall rate is 
  2 to 3 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...
  Northwestern Oklahoma City, El Reno, Kingfisher, Yukon, Bethany, 
  Warr Acres, Piedmont, Concho, Woodlawn Park, Richland and Wiley 
  Post Airport.

This includes the following highways...
	Interstate 40 between mile markers 118 and 136.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3586 9802 3589 9790 3572 9767 3570 9763
      3565 9756 3547 9763 3547 9774 3542 9806
      3553 9807 3571 9795

FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL...2-3 INCHES IN 1 HOUR

$$

Ware

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 29, 7:03 PM CDT	Special Weather Statement	OUN	Woods	27 min
Sep 29, 7:22 PM CDT	Special Weather Statement	OUN	Harper	23 min
Sep 29, 8:24 PM CDT	Special Weather Statement	OUN	Woods	36 min
Sep 30, 5:50 AM CDT	Special Weather Statement	OUN	Garfield	25 min
Sep 30, 6:29 AM CDT	Special Weather Statement	OUN	Garfield	31 min
Sep 30, 6:47 AM CDT	Special Weather Statement	OUN	Alfalfa	28 min
Sep 30, 7:04 AM CDT	Special Weather Statement	OUN	Garfield	26 min
Sep 30, 7:16 AM CDT	Special Weather Statement	OUN	Alfalfa	29 min
Sep 30, 7:39 AM CDT	Special Weather Statement	OUN	Alfalfa	36 min
Sep 30, 8:04 AM CDT	Areal Flood Advisory	OUN	Alfalfa, Garfield, Major	3 hr
Sep 30, 8:15 AM CDT	Special Weather Statement	OUN	Garfield, Major	30 min
Sep 30, 9:26 AM CDT	Areal Flood Advisory	OUN	Canadian, Kingfisher	3 hr
Sep 30, 10:08 AM CDT	Areal Flood Advisory	OUN	Logan, Oklahoma	3 hr
Sep 30, 10:17 AM CDT	Special Weather Statement	OUN	Oklahoma	28 min
Sep 30, 10:26 AM CDT	Special Weather Statement	OUN	Stephens	34 min
Sep 30, 10:36 AM CDT	Special Weather Statement	OUN	Lincoln	24 min
Sep 30, 11:10 AM CDT	Areal Flood Advisory	OUN	Cleveland, Lincoln, Logan, Oklahoma, Payne, Pottawatomie	3 hr
Sep 30, 11:39 AM CDT	Special Weather Statement	OUN	Jefferson	36 min
Sep 30, 11:59 AM CDT	Special Weather Statement	OUN	Jefferson	31 min
Sep 30, 12:21 PM CDT	Special Weather Statement	OUN	Garvin	24 min
Sep 30, 12:44 PM CDT	Special Weather Statement	OUN	Stephens	31 min
Sep 30, 12:58 PM CDT	Special Weather Statement	OUN	Jefferson	32 min
Sep 30, 1:18 PM CDT	Areal Flood Advisory	OUN	Jefferson, Stephens	3 hr
Sep 30, 1:52 PM CDT	Special Weather Statement	OUN	Hughes	23 min
Sep 30, 2:09 PM CDT	Areal Flood Advisory	OUN	Hughes, Seminole	4 hr
Sep 30, 2:19 PM CDT	Flash Flood Warning	OUN	Hughes, Seminole	4 hr
Sep 30, 2:32 PM CDT	Areal Flood Advisory	OUN	Carter, Johnston, Love, Murray	5 hr
Sep 30, 5:11 PM CDT	Special Weather Statement	OUN	Atoka	49 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.