Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 439, NWS Norman, OK

August 5, 2021Custer County, Dewey County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Aug 5, 2021, 7:05 PM CDT for Custer County, Dewey County, Oklahoma. It was in force for 25 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: Aug 5, 2021, 7:05 PM CDT (00:05 UTC)
Expired: Aug 5, 2021, 7:30 PM CDT
In force: 25 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Custer County, OK, Dewey County, OK

The radar

The Vance AFB radar (KVNX), 130 km from the middle of the area, began a volume at 00:05 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 00:00Z, 0.1 hours before the alert went out and 233 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: 372 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 2409 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

105 
WUUS54 KOUN 060005
SVROUN
OKC039-043-060030-
/O.NEW.KOUN.SV.W.0439.210806T0005Z-210806T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
705 PM CDT Thu Aug 5 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Central Custer County in western Oklahoma...
  South central Dewey County in northwestern Oklahoma...

* Until 730 PM CDT.

* At 704 PM CDT, severe thunderstorms were located along a line
  extending from 5 miles northwest of Putnam to 7 miles northwest of
  Arapaho, moving south at 10 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...
  Arapaho, Custer City and Putnam. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3597 9889 3555 9889 3555 9916 3598 9910
TIME...MOT...LOC 0004Z 355DEG 10KT 3592 9903 3565 9904 

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

30

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 5, 7:02 PM CDT	Areal Flood Advisory	OUN	Custer	3 hr
Aug 5, 7:26 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Washita	34 min
Aug 5, 7:37 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey	23 min
Aug 5, 7:47 PM CDT	Areal Flood Advisory	OUN	Custer	3 hr
Aug 5, 7:55 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Washita	36 min
Aug 5, 9:11 PM CDT	Special Weather Statement	OUN	Washita	34 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.