Alert archive / Texas / Severe Thunderstorm Watches in 2021

Severe Thunderstorm Watch 245

June 7, 202113 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Jun 7, 2021, 9:04 PM CDT for 13 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jun 7, 2021, 9:04 PM CDT (02:04 UTC)
Expired: Jun 8, 2021, 2:00 AM CDT
In force: 5 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

Counties Briscoe County, TX, Castro County, TX, Childress County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Floyd County, TX, Hale County, TX, Hall County, TX, King County, TX, Lamb County, TX, Motley County, TX, Swisher County, TX

The radar

The Lubbock radar (KLBB), 72 km from the middle of the area, began a volume at 02:05 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 5%
One or more EF2 to EF5 tornadoes: 2%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 20%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 20%
Six or more combined severe hail and wind reports: 60%

Warnings issued inside it

3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jun 7, 10:29 PM CDT	Severe Thunderstorm Warning	LUB	Briscoe, Swisher	61 min
Jun 7, 11:07 PM CDT	Severe Thunderstorm Warning	LUB	Briscoe, Floyd, Hale, Swisher	23 min
Jun 7, 11:25 PM CDT	Severe Thunderstorm Warning	LUB	Crosby, Floyd, Hale, Lubbock, Motley	65 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 2.1 hours before the alert went out and 119 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: 1124 J/kg
Mixed-layer CIN: -114 J/kg
Mixed-layer LCL: 2448 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.8

Open this sounding in Storm Lab

The text

As transmitted.

946 
WWUS20 KWNS 080203
SEL5  
SPC WW 080203
TXZ000-080700-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 245
NWS Storm Prediction Center Norman OK
905 PM CDT Mon Jun 7 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  The Texas South Plains

* Effective this Monday night and Tuesday morning from 905 PM
  until 200 AM CDT.

* Primary threats include...
  Isolated damaging wind gusts to 70 mph possible
  Isolated large hail events to 1.5 inches in diameter possible

SUMMARY...A cluster of thunderstorms northwest of Plainview will
likely continue moving east-southeastward into the early overnight
hours, and may intensify while encountering richer moisture near and
east of I-27.  Occasional damaging outflow gusts and large hail will
be the main threats.

The severe thunderstorm watch area is approximately along and 30
statute miles north and south of a line from 30 miles west of
Plainview TX to 30 miles south southeast of Childress TX. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU5).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 244...

AVIATION...A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
30020.

...Thompson

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 7, 7:03 PM CDT	Mesoscale Discussion	SPC	Bailey, Borden, Castro, Cochran, Crosby, Dawson and 16 more	2 hr
Jun 7, 10:28 PM CDT	Mesoscale Discussion	SPC	Briscoe, Castro, Cottle, Crosby, Dickens, Floyd and 10 more	92 min
Jun 8, 1:11 AM CDT	Mesoscale Discussion	SPC	Baylor, Fisher, Haskell, Jones, Kent, King and 6 more	2 hr
Jun 8, 4:53 AM CDT	Mesoscale Discussion	SPC	Bandera, Blanco, Burnet, Comal, Gillespie, Hays and 9 more	2 hr
Jun 8, 10:11 AM CDT	Mesoscale Discussion	SPC	Cherokee, Gregg, Harrison, Marion, Panola, Rusk	64 min

Nearby

Severe Thunderstorm Watches in Texas, 2021 Every severe thunderstorm watch 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.