Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 404, NWS Norman, OK

July 17, 2021Alfalfa County, Major County, Woods County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 17, 2021, 12:18 PM CDT for Alfalfa County, Major County, Woods County, Oklahoma. It was in force for 27 min. 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 17, 2021, 12:18 PM CDT (17:18 UTC)
Expired: Jul 17, 2021, 12:45 PM CDT
In force: 27 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Alfalfa County, OK, Major County, OK, Woods County, OK

The radar

The Vance AFB radar (KVNX), 54 km from the middle of the area, began a volume at 17:18 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, 5.3 hours before the alert went out and 202 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: 47 J/kg
Mixed-layer CIN: -256 J/kg
Mixed-layer LCL: 1918 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -95 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.

707 
WUUS54 KOUN 171718
SVROUN
OKC003-093-151-171745-
/O.NEW.KOUN.SV.W.0404.210717T1718Z-210717T1745Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
1218 PM CDT Sat Jul 17 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Southeastern Woods County in northwestern Oklahoma...
  Southwestern Alfalfa County in northwestern Oklahoma...
  Eastern Major County in northwestern Oklahoma...

* Until 1245 PM CDT.

* At 1218 PM CDT, a severe thunderstorm was located 5 miles northeast
  of Fairview, moving south at 10 mph.

  HAZARD...60 mph wind gusts and nickel size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Fairview, Cleo Springs, Ames, Aline, Isabella and Orienta. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3642 9865 3657 9840 3617 9813 3617 9858
TIME...MOT...LOC 1718Z 340DEG 9KT 3630 9839 

HAIL...0.88IN
WIND...60MPH
 
$$

JT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 8:21 PM CDT	Special Weather Statement	OUN	Johnston	24 min
Jul 16, 8:25 PM CDT	Special Weather Statement	OUN	Kay	35 min
Jul 16, 9:10 PM CDT	Areal Flood Advisory	OUN	Grant, Kay	3 hr
Jul 16, 9:31 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay	59 min
Jul 16, 10:08 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant	52 min
Jul 16, 10:51 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Major	39 min
Jul 16, 11:23 PM CDT	Areal Flood Advisory	OUN	Alfalfa, Garfield, Grant	3 hr
Jul 16, 11:41 PM CDT	Special Weather Statement	OUN	Kay	34 min
Jul 16, 11:47 PM CDT	Severe Thunderstorm Warning	OUN	Kay	26 min
Jul 17, 12:09 AM CDT	Areal Flood Advisory	OUN	Kay	3 hr
Jul 17, 12:25 AM CDT	Special Weather Statement	OUN	Kay	35 min
Jul 17, 11:29 AM CDT	Special Weather Statement	OUN	Alfalfa	46 min
Jul 17, 12:07 PM CDT	Special Weather Statement	OUN	Major	38 min
Jul 17, 12:24 PM CDT	Areal Flood Advisory	OUN	Alfalfa, Major, Woods	3 hr
Jul 17, 12:44 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher, Major	46 min
Jul 17, 1:04 PM CDT	Special Weather Statement	OUN	Dewey	26 min
Jul 17, 1:08 PM CDT	Special Weather Statement	OUN	Roger Mills	52 min
Jul 17, 1:23 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills	17 min
Jul 17, 1:32 PM CDT	Areal Flood Advisory	OUN	Blaine, Garfield, Kingfisher, Logan, Major	3 hr
Jul 17, 1:36 PM CDT	Areal Flood Advisory	OUN	Blaine, Dewey	3 hr
Jul 17, 1:43 PM CDT	Special Weather Statement	OUN	Logan	47 min
Jul 17, 1:47 PM CDT	Special Weather Statement	OUN	Kingfisher	43 min
Jul 17, 1:58 PM CDT	Special Weather Statement	OUN	Blaine	32 min
Jul 17, 2:10 PM CDT	Special Weather Statement	OUN	Ellis	35 min
Jul 17, 2:21 PM CDT	Special Weather Statement	OUN	Canadian, Logan	24 min
Jul 17, 2:24 PM CDT	Areal Flood Advisory	OUN	Kingfisher, Logan	3 hr
Jul 17, 2:39 PM CDT	Special Weather Statement	OUN	Canadian	66 min
Jul 17, 2:42 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Woodward	36 min
Jul 17, 2:44 PM CDT	Areal Flood Advisory	OUN	Dewey, Ellis, Roger Mills, Woodward	3 hr
Jul 17, 2:48 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher	42 min
Jul 17, 2:57 PM CDT	Areal Flood Advisory	OUN	Blaine, Caddo	3 hr
Jul 17, 3:06 PM CDT	Areal Flood Advisory	OUN	Canadian, Kingfisher	3 hr
Jul 17, 3:12 PM CDT	Special Weather Statement	OUN	Logan	48 min
Jul 17, 3:21 PM CDT	Special Weather Statement	OUN	Caddo	54 min
Jul 17, 3:32 PM CDT	Special Weather Statement	OUN	Oklahoma	58 min
Jul 17, 3:33 PM CDT	Special Weather Statement	OUN	Canadian	27 min
Jul 17, 3:38 PM CDT	Areal Flood Advisory	OUN	Oklahoma	112 min
Jul 17, 4:01 PM CDT	Special Weather Statement	OUN	Caddo	44 min
Jul 17, 4:03 PM CDT	Special Weather Statement	OUN	Grady	42 min
Jul 17, 4:30 PM CDT	Special Weather Statement	OUN	Greer	45 min
Jul 17, 4:34 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady, Kiowa	41 min
Jul 17, 4:43 PM CDT	Special Weather Statement	OUN	Cleveland	62 min
Jul 17, 4:53 PM CDT	Special Weather Statement	OUN	Greer	67 min
Jul 17, 5:06 PM CDT	Severe Thunderstorm Warning	OUN	Harmon	37 min
Jul 17, 5:41 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	49 min
Jul 17, 6:50 PM CDT	Special Weather Statement	OUN	Cotton	25 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2021 Every severe thunderstorm 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.