Alert archive / Texas / Tornado Warnings in 2021

Tornado Warning 47, NWS Norman, OK

November 10, 2021Clay County, Texas

NWS Norman, OK issued this tornado warning at Nov 10, 2021, 6:17 PM CST for Clay County, Texas. It was in force for 28 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: Nov 10, 2021, 6:17 PM CST (00:17 UTC)
Expired: Nov 10, 2021, 6:45 PM CST
In force: 28 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.75 in

County Clay County, TX

The radar

The Altus AFB radar (KFDR), 84 km from the middle of the area, began a volume at 00:19 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 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

Fort Worth, TX (KFWD), launched 00:00Z, 0.3 hours before the alert went out and 150 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: 1140 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1186 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 238 m²/s²
0-3 km storm-relative helicity: 243 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 8.1

Open this sounding in Storm Lab

The text

As transmitted.

002 
WFUS54 KOUN 110017
TOROUN
TXC077-110045-
/O.NEW.KOUN.TO.W.0047.211111T0017Z-211111T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Norman OK
617 PM CST Wed Nov 10 2021

The National Weather Service in Norman has issued a

* Tornado Warning for...
  Northern Clay County in northern Texas...

* Until 645 PM CST.
    
* At 617 PM CST, a severe thunderstorm capable of producing a tornado
  was located 4 miles southwest of Petrolia, moving southeast at 30
  mph.

  HAZARD...Tornado and golf ball size hail.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* Locations impacted include...
  Henrietta, Petrolia and Dean. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a storm shelter, safe room or an interior
room on the lowest floor of a sturdy building. Avoid windows. If you
are outdoors, in a mobile home, or in a vehicle, move to the closest
substantial shelter and protect yourself from flying debris.

&&

LAT...LON 3395 9837 3405 9829 3390 9801 3378 9810
TIME...MOT...LOC 0017Z 301DEG 24KT 3396 9828 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.75 IN

$$

..speg.

2 follow-up statements

973 
WWUS54 KOUN 110028
SVSOUN

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

TXC077-110045-
/O.CON.KOUN.TO.W.0047.000000T0000Z-211111T0045Z/
Clay TX-
628 PM CST Wed Nov 10 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM CST FOR
NORTHEASTERN CLAY COUNTY...
    
At 627 PM CST, a severe thunderstorm capable of producing a tornado 
was located 5 miles south of Petrolia, moving east-southeast at 30 
mph.

HAZARD...Tornado and golf ball size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Petrolia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a storm shelter, safe room, or an interior
room on the lowest floor of a sturdy building. Avoid windows. If you
are outdoors, in a mobile home, or in a vehicle, move to the closest
substantial shelter and protect yourself from flying debris.

&&

LAT...LON 3395 9829 3402 9824 3390 9801 3380 9808
TIME...MOT...LOC 0027Z 291DEG 26KT 3393 9820 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.75 IN

$$

..speg.

918 
WWUS54 KOUN 110045
SVSOUN

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

TXC077-110054-
/O.EXP.KOUN.TO.W.0047.000000T0000Z-211111T0045Z/
Clay TX-
645 PM CST Wed Nov 10 2021

...THE TORNADO WARNING FOR CENTRAL CLAY COUNTY WILL EXPIRE AT 645 PM
CST...
    
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and a
Severe Thunderstorm Warning remains in effect for the area.

LAT...LON 3395 9829 3402 9824 3390 9801 3380 9808
TIME...MOT...LOC 0044Z 301DEG 24KT 3387 9809 

$$

..speg.

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 10, 6:30 PM CST	Severe Thunderstorm Warning Considerable damage threat	OUN	Archer, Clay, Wichita	45 min
Nov 10, 6:42 PM CST	Severe Thunderstorm Warning	OUN	Clay	21 min
Nov 10, 7:00 PM CST	Severe Thunderstorm Warning	OUN	Archer, Clay	45 min

Nearby

Tornado Warnings in Texas, 2021 Every tornado warning in 2021 Tornadoes 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.