Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 96, NWS Norman, OK

April 23, 2021Foard County, Knox County, Texas

NWS Norman, OK issued this severe thunderstorm warning at Apr 23, 2021, 5:17 PM CDT for Foard County, Knox County, Texas. It was in force for 43 min. 3 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: Apr 23, 2021, 5:17 PM CDT (22:17 UTC)
Expired: Apr 23, 2021, 6:00 PM CDT
In force: 43 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Foard County, TX, Knox County, TX

The radar

The Altus AFB radar (KFDR), 81 km from the middle of the area, began a volume at 22:19 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.

What was reported inside it

Time	Report	Where	Remark
Apr 23, 5:34 PM CDT	HAIL 2	8 N Truscott, TX
Apr 23, 5:41 PM CDT	HAIL 2.75	7 N Truscott, TX	SPOTTER NETWORK
Apr 23, 5:45 PM CDT	HAIL 3.5	9 N Gilliland, TX	TWITTER REPORT WITH PICTURE. LOCATION ESTIMATED BASED ON RADAR.

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
Apr 23, 3:14 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 10.3 hours before the alert went out and 234 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1968 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 245 m²/s²
0-3 km storm-relative helicity: 248 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

812 
WUUS54 KOUN 232217
SVROUN
TXC155-275-232300-
/O.NEW.KOUN.SV.W.0096.210423T2217Z-210423T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
517 PM CDT Fri Apr 23 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Southern Foard County in northern Texas...
  North central Knox County in northern Texas...

* Until 600 PM CDT.

* At 517 PM CDT, a severe thunderstorm was located 9 miles northwest
  of Truscott, moving east 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...
  Crowell, Thalia and Rayland. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms.

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

&&

LAT...LON 3407 9948 3378 9948 3383 9997 3394 10002
TIME...MOT...LOC 2217Z 254DEG 24KT 3388 9991 

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

Ware

2 follow-up statements

760 
WWUS54 KOUN 232236
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
536 PM CDT Fri Apr 23 2021

TXC275-232245-
/O.CAN.KOUN.SV.W.0096.000000T0000Z-210423T2300Z/
Knox TX-
536 PM CDT Fri Apr 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL KNOX COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3397 9988 3407 9948 3378 9948 3379 9955
      3380 9954 3379 9958 3380 9958 3380 9962
      3382 9964 3381 9966 3383 9969 3381 9970
      3381 9975 3382 9976 3382 9977 3383 9988
TIME...MOT...LOC 2235Z 254DEG 24KT 3391 9976 

$$

TXC155-232300-
/O.CON.KOUN.SV.W.0096.000000T0000Z-210423T2300Z/
Foard TX-
536 PM CDT Fri Apr 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR SOUTHEASTERN FOARD COUNTY...

At 535 PM CDT, a severe thunderstorm was located 5 miles southwest 
of Crowell, moving east at 30 mph. Two-inch hail has been reported 8 
miles north of Truscott.

HAZARD...Two inch hail and 60 mph wind gusts.

SOURCE...Trained weather spotters.

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...
Crowell, Thalia and Rayland. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms.

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

&&

LAT...LON 3397 9988 3407 9948 3378 9948 3379 9955
      3380 9954 3379 9958 3380 9958 3380 9962
      3382 9964 3381 9966 3383 9969 3381 9970
      3381 9975 3382 9976 3382 9977 3383 9988
TIME...MOT...LOC 2235Z 254DEG 24KT 3391 9976 

HAIL...2.00IN
WIND...60MPH
 
$$

Ware

864 
WWUS54 KOUN 232244
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
544 PM CDT Fri Apr 23 2021

TXC155-232300-
/O.CON.KOUN.SV.W.0096.000000T0000Z-210423T2300Z/
Foard TX-
544 PM CDT Fri Apr 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR SOUTHEASTERN FOARD COUNTY...

At 543 PM CDT, a severe thunderstorm was located 4 miles southeast 
of Crowell, moving east at 30 mph. Baseball sized hail was reported 
7 miles north of Truscott.  

This is a very dangerous storm.

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

SOURCE...Trained weather spotters.

IMPACT...People and animals outdoors will be severely injured. 
         Expect shattered windows, extensive damage to roofs, 
         siding, and vehicles.

Locations impacted include...
Crowell, Thalia and Rayland. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms.

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

&&

LAT...LON 3397 9988 3407 9948 3378 9948 3379 9955
      3380 9954 3379 9958 3380 9958 3380 9962
      3382 9964 3381 9966 3383 9969 3381 9970
      3381 9975 3382 9976 3382 9977 3383 9988
TIME...MOT...LOC 2243Z 254DEG 24KT 3393 9969 

HAIL...2.75IN
WIND...60MPH
 
$$

Ware

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 23, 1:58 PM CDT	Special Weather Statement	OUN	Clay	47 min
Apr 23, 4:44 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman	46 min
Apr 23, 4:52 PM CDT	Special Weather Statement	OUN	Foard	38 min
Apr 23, 5:23 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox	52 min
Apr 23, 5:28 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman	47 min
Apr 23, 5:40 PM CDT	Tornado Warning	OUN	Foard, Hardeman	39 min
Apr 23, 5:52 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Foard, Wilbarger	38 min
Apr 23, 5:59 PM CDT	Tornado Warning Tornado observed	OUN	Foard, Hardeman, Wilbarger	46 min
Apr 23, 6:08 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor, Wichita	52 min
Apr 23, 6:18 PM CDT	Tornado Warning Tornado observedConsiderable damage threat	OUN	Foard, Hardeman, Wilbarger	42 min
Apr 23, 6:43 PM CDT	Tornado Warning Tornado observed	OUN	Wilbarger	32 min
Apr 23, 6:57 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Wichita	19 min

Nearby

Severe Thunderstorm Warnings in Texas, 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.