Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 574, NWS Norman, OK

November 10, 2021Carter County, Garvin County, Stephens County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Nov 10, 2021, 6:20 PM CST for Carter County, Garvin County, Stephens County, Oklahoma. It was in force for 40 min. 2 reports 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: Nov 10, 2021, 6:20 PM CST (00:20 UTC)
Expired: Nov 10, 2021, 7:00 PM CST
In force: 40 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Carter County, OK, Garvin County, OK, Stephens County, OK

The radar

The Norman radar (KTLX), 89 km from the middle of the area, began a volume at 00:23 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
Nov 10, 6:23 PM CST	HAIL 1	4 Ne Bray, OK	DIMES AND QUARTERS. TIME ESTIMATED BASED ON RADAR.
Nov 10, 6:39 PM CST	TORNADO	4 Se Bray, OK

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Nov 10, 3:26 PM CST	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.3 hours before the alert went out and 73 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: 964 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 884 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 186 m²/s²
0-3 km storm-relative helicity: 206 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.4

Open this sounding in Storm Lab

The text

As transmitted.

279 
WUUS54 KOUN 110020
SVROUN
OKC019-049-137-110100-
/O.NEW.KOUN.SV.W.0574.211111T0020Z-211111T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
620 PM CST Wed Nov 10 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Southwestern Garvin County in southern Oklahoma...
  Northeastern Stephens County in southern Oklahoma...
  Northwestern Carter County in southern Oklahoma...

* Until 700 PM CST.

* At 620 PM CST, a severe thunderstorm was located near Bray, moving
  east at 25 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...
  Bray, Foster, Ratliff City and Pernell. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3463 9793 3468 9788 3468 9767 3467 9741
      3453 9745 3445 9752
TIME...MOT...LOC 0020Z 291DEG 21KT 3465 9779 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Mahale

1 follow-up statement

217 
WWUS54 KOUN 110025
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
625 PM CST Wed Nov 10 2021

OKC019-049-137-110100-
/O.CON.KOUN.SV.W.0574.000000T0000Z-211111T0100Z/
Garvin OK-Stephens OK-Carter OK-
625 PM CST Wed Nov 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CST
FOR SOUTHWESTERN GARVIN...NORTHEASTERN STEPHENS AND NORTHWESTERN
CARTER COUNTIES...

At 625 PM CST, a severe thunderstorm was located near Bray, moving
east at 25 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
Bray, Foster, Ratliff City and Pernell. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

LAT...LON 3461 9788 3468 9786 3468 9767 3467 9741
      3453 9745 3445 9752
TIME...MOT...LOC 0025Z 291DEG 21KT 3464 9776 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Mahale

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 10, 6:15 PM CST	Special Weather Statement	OUN	Garvin	30 min
Nov 10, 6:18 PM CST	Severe Thunderstorm Warning Considerable damage threat	OUN	Payne	27 min
Nov 10, 6:24 PM CST	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Oklahoma, Payne, Pottawatomie	51 min
Nov 10, 6:36 PM CST	Special Weather Statement	OUN	Cleveland, McClain	24 min
Nov 10, 6:40 PM CST	Tornado Warning	OUN	Carter, Garvin, Stephens	27 min
Nov 10, 6:42 PM CST	Severe Thunderstorm Warning	OUN	Jefferson	21 min
Nov 10, 7:10 PM CST	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Oklahoma, Pottawatomie, Seminole	50 min
Nov 10, 7:11 PM CST	Special Weather Statement	OUN	Carter	34 min
Nov 10, 7:13 PM CST	Special Weather Statement	OUN	Garvin	32 min
Nov 10, 7:17 PM CST	Special Weather Statement	OUN	Bryan	13 min
Nov 10, 7:18 PM CST	Special Weather Statement	OUN	Pontotoc	27 min
Nov 10, 7:31 PM CST	Special Weather Statement	OUN	Bryan	29 min
Nov 10, 7:33 PM CST	Special Weather Statement	OUN	Bryan	27 min
Nov 10, 7:41 PM CST	Severe Thunderstorm Warning	OUN	Bryan	19 min
Nov 10, 7:46 PM CST	Tornado Warning	OUN	Carter, Murray	27 min
Nov 10, 8:16 PM CST	Special Weather Statement	OUN	Carter	29 min
Nov 10, 8:28 PM CST	Special Weather Statement	OUN	Coal	32 min
Nov 10, 8:50 PM CST	Special Weather Statement	OUN	Atoka	25 min
Nov 10, 8:56 PM CST	Special Weather Statement	OUN	Atoka	34 min
Nov 10, 9:13 PM CST	Special Weather Statement	OUN	Atoka	32 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.