Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 413, NWS Norman, OK

July 18, 2021Woods County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 18, 2021, 4:34 PM CDT for Woods County, Oklahoma. It was in force for 41 min. 1 report 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: Jul 18, 2021, 4:34 PM CDT (21:34 UTC)
Expired: Jul 18, 2021, 5:15 PM CDT
In force: 41 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Woods County, OK

The radar

The Vance AFB radar (KVNX), 71 km from the middle of the area, began a volume at 21:35 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
Jul 18, 4:40 PM CDT	TSTM WND GST 74	16 Nne Freedom, OK

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

The nearest sounding before it

Dodge City, (KDDC), launched 12:00Z, 9.6 hours before the alert went out and 135 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: 525 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 1199 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

383 
WUUS54 KOUN 182134
SVROUN
OKC151-182215-
/O.NEW.KOUN.SV.W.0413.210718T2134Z-210718T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
434 PM CDT Sun Jul 18 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Northeastern Woods County in northwestern Oklahoma...

* Until 515 PM CDT.

* At 433 PM CDT, a severe thunderstorm was located 6 miles southwest
  of Aetna Kansas, moving southeast at 30 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Alva.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3700 9883 3676 9863 3663 9900 3664 9902
      3700 9918
TIME...MOT...LOC 2133Z 335DEG 27KT 3702 9905 

HAIL...1.00IN
WIND...60MPH
 
$$

..speg.

3 follow-up statements

043 
WWUS54 KOUN 182151
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
451 PM CDT Sun Jul 18 2021

OKC151-182215-
/O.CON.KOUN.SV.W.0413.000000T0000Z-210718T2215Z/
Woods OK-
451 PM CDT Sun Jul 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM CDT
FOR NORTHEASTERN WOODS COUNTY...

At 451 PM CDT, the leading edge of winds from severe thunderstorms
was located along a line extending from 11 miles west of Hardtner to
13 miles northwest of Avard to 3 miles northeast of Freedom, moving
southeast at 30 mph.

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

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Alva.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3700 9883 3676 9863 3663 9900 3664 9902
      3700 9918
TIME...MOT...LOC 2151Z 328DEG 25KT 3695 9884 3687 9890 3679 9906 

HAIL...1.00IN
WIND...60MPH
 
$$

..speg.

347 
WWUS54 KOUN 182153
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
453 PM CDT Sun Jul 18 2021

OKC151-182215-
/O.CON.KOUN.SV.W.0413.000000T0000Z-210718T2215Z/
Woods OK-
453 PM CDT Sun Jul 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM CDT
FOR NORTHEASTERN WOODS COUNTY...

At 451 PM CDT, the leading edge of winds from severe thunderstorms
was located along a line extending from 11 miles west of Hardtner to
13 miles northwest of Avard to 3 miles northeast of Freedom, moving 
southeast at 30 mph. Winds of 74 mph have been measured in northern 
Woods County near May Ranch.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Alva.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3700 9883 3676 9863 3663 9900 3664 9902
      3700 9918
TIME...MOT...LOC 2151Z 328DEG 25KT 3695 9884 3687 9890 3679 9906 

HAIL...1.00IN
WIND...70MPH
 
$$

..speg.

680 
WWUS54 KOUN 182214
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
514 PM CDT Sun Jul 18 2021

OKC151-182224-
/O.EXP.KOUN.SV.W.0413.000000T0000Z-210718T2215Z/
Woods OK-
514 PM CDT Sun Jul 18 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WOODS COUNTY WILL
EXPIRE AT 515 PM CDT...
             
The storms which prompted the warning have weakened below severe
limits, therefore the warning will be allowed to expire.  However
gusty winds and heavy rain are still possible with these
thunderstorms.

LAT...LON 3700 9883 3676 9863 3663 9900 3664 9902
      3700 9918
TIME...MOT...LOC 2214Z 335DEG 27KT 3681 9876 3673 9882 3665 9898 

$$

..speg.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 7:12 PM CDT	Areal Flood Advisory	OUN	Cotton	3 hr
Jul 18, 2:44 PM CDT	Special Weather Statement	OUN	Woodward	46 min
Jul 18, 3:07 PM CDT	Special Weather Statement	OUN	Custer	23 min
Jul 18, 3:18 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Woodward	42 min
Jul 18, 3:28 PM CDT	Special Weather Statement	OUN	Kiowa	32 min
Jul 18, 3:57 PM CDT	Special Weather Statement	OUN	Dewey	33 min
Jul 18, 4:01 PM CDT	Special Weather Statement	OUN	Kiowa	29 min
Jul 18, 4:35 PM CDT	Special Weather Statement	OUN	Custer, Dewey	25 min
Jul 18, 4:58 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Kiowa	26 min
Jul 18, 5:01 PM CDT	Special Weather Statement	OUN	Caddo	29 min
Jul 18, 5:04 PM CDT	Special Weather Statement	OUN	Caddo	26 min
Jul 18, 5:05 PM CDT	Special Weather Statement	OUN	Custer	25 min
Jul 18, 5:14 PM CDT	Special Weather Statement	OUN	Woods	31 min
Jul 18, 5:31 PM CDT	Special Weather Statement	OUN	Ellis	29 min
Jul 18, 5:34 PM CDT	Special Weather Statement	OUN	Custer	26 min
Jul 18, 5:50 PM CDT	Special Weather Statement	OUN	Woodward	25 min
Jul 18, 5:59 PM CDT	Special Weather Statement	OUN	Caddo	31 min
Jul 18, 6:02 PM CDT	Special Weather Statement	OUN	Tillman	28 min
Jul 18, 6:04 PM CDT	Special Weather Statement	OUN	Roger Mills	26 min
Jul 18, 6:08 PM CDT	Special Weather Statement	OUN	Washita	37 min
Jul 18, 6:32 PM CDT	Special Weather Statement	OUN	Washita	28 min
Jul 18, 6:39 PM CDT	Special Weather Statement	OUN	Cleveland	36 min
Jul 18, 6:42 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland	33 min
Jul 18, 6:50 PM CDT	Special Weather Statement	OUN	Grady	25 min
Jul 18, 6:52 PM CDT	Special Weather Statement	OUN	Tillman	38 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.