Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 129, NWS Norman, OK

April 27, 2021Baylor County, Knox County, Wilbarger County, Texas

NWS Norman, OK issued this severe thunderstorm warning at Apr 27, 2021, 7:58 PM CDT for Baylor County, Knox County, Wilbarger County, Texas. It was in force for 47 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: Apr 27, 2021, 7:58 PM CDT (00:58 UTC)
Expired: Apr 27, 2021, 8:45 PM CDT
In force: 47 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Baylor County, TX, Knox County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 79 km from the middle of the area, began a volume at 01:03 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
Apr 27, 1:57 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 1.0 hours before the alert went out and 224 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: 692 J/kg
Mixed-layer CIN: -275 J/kg
Mixed-layer LCL: 967 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 197 m²/s²
0-3 km storm-relative helicity: 388 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

699 
WUUS54 KOUN 280058
SVROUN
TXC023-275-487-280145-
/O.NEW.KOUN.SV.W.0129.210428T0058Z-210428T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
758 PM CDT Tue Apr 27 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  East central Knox County in northern Texas...
  Southeastern Wilbarger County in northern Texas...
  Northwestern Baylor County in northern Texas...

* Until 845 PM CDT.

* At 758 PM CDT, a severe thunderstorm was located near Vera, moving
  northeast at 35 mph.

  HAZARD...Ping pong 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...
  Red Springs, Lake Kemp, Grayback, Vera and Bomarton. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3367 9965 3377 9952 3377 9949 3375 9949
      3375 9948 3381 9948 3406 9916 3385 9895
      3347 9948
TIME...MOT...LOC 0058Z 228DEG 32KT 3363 9951 

HAIL...1.50IN
WIND...60MPH
 
$$

JT

1 follow-up statement

856 
WWUS54 KOUN 280112
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
812 PM CDT Tue Apr 27 2021

TXC275-280121-
/O.CAN.KOUN.SV.W.0129.000000T0000Z-210428T0145Z/
Knox TX-
812 PM CDT Tue Apr 27 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL KNOX COUNTY IS
CANCELLED...
    
The severe thunderstorm over Knox County has moved into Baylor 
County. Therefore, the warning has been cancelled.

LAT...LON 3381 9948 3406 9916 3385 9895 3348 9947
TIME...MOT...LOC 0111Z 228DEG 32KT 3371 9940 

$$

TXC023-487-280145-
/O.CON.KOUN.SV.W.0129.000000T0000Z-210428T0145Z/
Wilbarger TX-Baylor TX-
812 PM CDT Tue Apr 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM CDT
FOR SOUTHEASTERN WILBARGER AND NORTHWESTERN BAYLOR COUNTIES...

At 811 PM CDT, a severe thunderstorm was located 6 miles north of Red
Springs, moving northeast at 35 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...
Red Springs, Lake Kemp, Grayback and Bomarton. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3381 9948 3406 9916 3385 9895 3348 9947
TIME...MOT...LOC 0111Z 228DEG 32KT 3371 9940 

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

JT

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 27, 7:09 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Foard, Knox	51 min
Apr 27, 7:15 PM CDT	Severe Thunderstorm Warning	OUN	Wichita, Wilbarger	45 min
Apr 27, 7:44 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Wilbarger	46 min
Apr 27, 7:53 PM CDT	Tornado Warning	OUN	Wichita	24 min
Apr 27, 8:39 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor, Wichita, Wilbarger	51 min
Apr 27, 9:06 PM CDT	Special Weather Statement	OUN	Baylor	39 min
Apr 27, 9:35 PM CDT	Special Weather Statement	OUN	Wichita	25 min
Apr 27, 9:54 PM CDT	Special Weather Statement	OUN	Archer	51 min
Apr 27, 10:09 PM CDT	Special Weather Statement	OUN	Wichita	51 min
Apr 27, 10:47 PM CDT	Areal Flood Advisory	OUN	Wichita	118 min
Apr 27, 10:57 PM CDT	Severe Thunderstorm Warning	OUN	Clay	20 min
Apr 27, 11:13 PM CDT	Special Weather Statement	OUN	Clay	47 min
Apr 28, 1:13 AM CDT	Areal Flood Advisory	OUN	Archer, Clay, Wichita	4 hr
Apr 28, 3:11 AM CDT	Flash Flood Warning	OUN	Archer, Clay, Wichita	6 hr
Apr 28, 3:33 AM CDT	Special Weather Statement	OUN	Wichita	27 min
Apr 28, 4:00 AM CDT	Special Weather Statement	OUN	Baylor	30 min
Apr 28, 4:24 AM CDT	Areal Flood Advisory	OUN	Archer, Baylor	3 hr
Apr 28, 4:57 AM CDT	Special Weather Statement	OUN	Clay	33 min
Apr 28, 5:28 AM CDT	Tornado Warning	OUN	Clay	17 min
Apr 28, 4:38 PM CDT	Special Weather Statement	OUN	Hardeman	37 min
Apr 28, 5:12 PM CDT	Special Weather Statement	OUN	Foard	33 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.