Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 435, NWS Norman, OK

July 31, 2021Woods County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 31, 2021, 4:25 PM CDT for Woods County, Oklahoma. It was in force for 35 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 31, 2021, 4:25 PM CDT (21:25 UTC)
Expired: Jul 31, 2021, 5:00 PM CDT
In force: 35 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

County Woods County, OK

The radar

The Vance AFB radar (KVNX), 87 km from the middle of the area, began a volume at 21:26 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, 9.4 hours before the alert went out and 118 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: 468 J/kg
Mixed-layer CIN: -148 J/kg
Mixed-layer LCL: 2050 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

162 
WUUS54 KOUN 312125
SVROUN
OKC151-312200-
/O.NEW.KOUN.SV.W.0435.210731T2125Z-210731T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
425 PM CDT Sat Jul 31 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  North central Woods County in northwestern Oklahoma...

* Until 500 PM CDT.

* At 425 PM CDT, a severe thunderstorm was located 11 miles southwest
  of Aetna, and is nearly stationary.

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

  SOURCE...Radar indicated.

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

* This severe thunderstorm will remain over mainly rural areas of
  north central Woods County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3688 9906 3692 9918 3700 9916 3700 9897
      3693 9901
TIME...MOT...LOC 2125Z 301DEG 2KT 3696 9911 

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

Mahale

1 follow-up statement

934 
WWUS54 KOUN 312151
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
451 PM CDT Sat Jul 31 2021

OKC151-312201-
/O.EXP.KOUN.SV.W.0435.000000T0000Z-210731T2200Z/
Woods OK-
451 PM CDT Sat Jul 31 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL WOODS COUNTY
WILL EXPIRE AT 500 PM CDT...
                 
The storm which prompted the warning has weakened below severe
limits, therefore the warning will be allowed to expire.

LAT...LON 3688 9906 3692 9918 3700 9916 3700 9897
      3693 9901
TIME...MOT...LOC 2151Z 301DEG 2KT 3695 9909 

$$

Mahale

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 2:08 PM CDT	Heat Advisory	OUN	Atoka, Bryan	19 hr
Jul 31, 3:48 PM CDT	Severe Thunderstorm Warning	OUN	Woods	42 min
Jul 31, 4:51 PM CDT	Special Weather Statement	OUN	Harper	24 min
Jul 31, 4:51 PM CDT	Special Weather Statement	OUN	Woods	24 min
Jul 31, 4:57 PM CDT	Severe Thunderstorm Warning	OUN	Woods, Woodward	35 min
Jul 31, 5:03 PM CDT	Special Weather Statement	OUN	Kay	27 min
Jul 31, 5:35 PM CDT	Special Weather Statement	OUN	Kay	25 min
Jul 31, 5:52 PM CDT	Special Weather Statement	OUN	Woods	23 min
Jul 31, 5:57 PM CDT	Special Weather Statement	OUN	Woodward	33 min
Jul 31, 6:03 PM CDT	Special Weather Statement	OUN	Grant	27 min
Jul 31, 6:15 PM CDT	Special Weather Statement	OUN	Harper	30 min
Jul 31, 6:29 PM CDT	Special Weather Statement	OUN	Woods	31 min
Jul 31, 6:34 PM CDT	Severe Thunderstorm Warning	OUN	Grant	41 min
Jul 31, 6:41 PM CDT	Special Weather Statement	OUN	Harper	34 min
Jul 31, 6:48 PM CDT	Special Weather Statement	OUN	Woods	27 min
Jul 31, 6:59 PM CDT	Severe Thunderstorm Warning	OUN	Grant	15 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.