Alert archive / Texas / Tornado Watches in 2021

Tornado Watch 20

March 13, 202125 counties in Texas

The Storm Prediction Center issued this tornado watch at Mar 13, 2021, 2:26 PM CST for 25 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Mar 13, 2021, 2:26 PM CST (20:26 UTC)
Expired
Mar 13, 2021, 9:00 PM CST
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
70 kt
All 25 counties

Armstrong County, TX, Briscoe County, TX, Carson County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Donley County, TX, Floyd County, TX, Garza County, TX, Gray County, TX, Hall County, TX, Hansford County, TX, Hemphill County, TX, Hutchinson County, TX, Kent County, TX, King County, TX, Lipscomb County, TX, Lynn County, TX, Motley County, TX, Ochiltree County, TX, Roberts County, TX, Stonewall County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 103 km from the middle of the area, began a volume at 20:29 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
80%
One or more EF2 to EF5 tornadoes
60%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
60%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
60%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Mar 13, 3:12 PM CSTSevere Thunderstorm WarningAMAArmstrong, Randall63 min
Mar 13, 3:50 PM CSTTornado Warning Tornado observedConsiderable damage threatAMAArmstrong, Randall40 min
Mar 13, 4:00 PM CSTTornado WarningAMAArmstrong, Randall45 min
Mar 13, 4:21 PM CSTTornado Warning Tornado observedConsiderable damage threatAMAArmstrong, Carson39 min
Mar 13, 4:28 PM CSTTornado Warning Tornado observedLUBBriscoe, Floyd, Hale, Swisher32 min
Mar 13, 4:30 PM CSTSevere Thunderstorm WarningAMAHansford, Hutchinson, Moore, Sherman60 min
Mar 13, 4:35 PM CSTTornado WarningLUBCrosby, Floyd25 min
Mar 13, 4:42 PM CSTTornado Warning Tornado observedAMAArmstrong, Carson, Donley, Gray48 min
Mar 13, 4:43 PM CSTSevere Thunderstorm WarningLUBGarza, Lynn32 min
Mar 13, 4:51 PM CSTTornado WarningLUBFloyd24 min
Mar 13, 4:52 PM CSTTornado WarningAMACarson, Gray38 min
Mar 13, 4:55 PM CSTTornado WarningLUBBriscoe35 min
Mar 13, 4:56 PM CSTSevere Thunderstorm WarningLUBCrosby34 min
Mar 13, 5:11 PM CSTTornado WarningLUBFloyd, Motley34 min
Mar 13, 5:14 PM CSTTornado WarningAMAArmstrong, Donley46 min
Mar 13, 5:14 PM CSTSevere Thunderstorm WarningLUBGarza, Lynn46 min
Mar 13, 5:20 PM CSTTornado Warning Tornado observedLUBBriscoe25 min
Mar 13, 5:26 PM CSTSevere Thunderstorm WarningLUBGarza34 min
Mar 13, 5:30 PM CSTSevere Thunderstorm WarningLUBCrosby, Dickens45 min
Mar 13, 5:39 PM CSTTornado WarningLUBFloyd, Motley36 min
Mar 13, 5:43 PM CSTTornado Warning Tornado observedAMADonley47 min
Mar 13, 5:54 PM CSTSevere Thunderstorm WarningLUBCrosby, Dickens, Motley36 min
Mar 13, 6:16 PM CSTSevere Thunderstorm WarningLUBHall12 min
Mar 13, 6:23 PM CSTTornado WarningAMACollingsworth, Donley, Gray, Wheeler37 min
Mar 13, 6:28 PM CSTSevere Thunderstorm WarningLUBCottle, Dickens, King, Motley47 min
Mar 13, 6:47 PM CSTTornado WarningLUBCottle, Motley28 min
Mar 13, 6:52 PM CSTTornado WarningAMAGray, Hemphill, Roberts, Wheeler38 min
Mar 13, 7:03 PM CSTSevere Thunderstorm WarningAMAArmstrong, Carson, Donley, Gray, Roberts57 min
Mar 13, 7:11 PM CSTSevere Thunderstorm WarningLUBChildress, Cottle49 min
Mar 13, 7:52 PM CSTSevere Thunderstorm WarningAMAGray, Hemphill, Lipscomb, Roberts, Wheeler83 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 12:00Z, 8.4 hours before the alert went out and 102 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-pSkew-T log-p diagram, Amarillo Airport, TX at 12:00Z on 2021-03-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 188 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Amarillo Airport, TX at 12:00Z on 2021-03-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 162 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
188 J/kg
Mixed-layer CIN
-140 J/kg
Mixed-layer LCL
540 m above ground
0-6 km bulk shear
73 kt
0-1 km storm-relative helicity
162 m²/s²
0-3 km storm-relative helicity
216 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.9

Open this sounding in Storm Lab

The text

As transmitted.

182 
WWUS20 KWNS 132023
SEL0  
SPC WW 132023
TXZ000-140300-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 20
NWS Storm Prediction Center Norman OK
225 PM CST Sat Mar 13 2021

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Northwest Texas

* Effective this Saturday afternoon and evening from 225 PM until
  900 PM CST.

* Primary threats include...
  Several tornadoes and a couple intense tornadoes likely
  Scattered damaging winds and isolated significant gusts to 80
    mph likely
  Scattered large hail and isolated very large hail events to 3
    inches in diameter likely

SUMMARY...Multiple supercells and clusters are expected to evolve
northeast across the Texas Panhandle and adjacent portion of the
South Plains. Tornadoes and large hail will be most likely with
cells that able to remain mostly discrete. While the potential for
damaging winds will increase as storms become more linear this
evening.

The tornado watch area is approximately along and 45 statute miles
east and west of a line from 60 miles northeast of Borger TX to 105
miles south southwest of Childress TX. For a complete depiction of
the watch see the associated watch outline update (WOUS64 KWNS
WOU0).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and 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.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 19...

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 3 inches. Extreme turbulence and surface wind
gusts to 70 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 22040.

...Grams

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 12, 8:11 PM CSTMesoscale DiscussionSPCBaylor, Briscoe, Childress, Cottle, Crosby, Dickens and 18 more64 min
Mar 12, 8:38 PM CSTSevere Thunderstorm WatchSPCArmstrong, Baylor, Briscoe, Carson, Childress, Cochran and 29 more5 hr
Mar 12, 11:08 PM CSTMesoscale DiscussionSPCArmstrong, Briscoe, Carson, Castro, Childress, Collingsworth and 26 more2 hr
Mar 13, 1:06 AM CSTMesoscale DiscussionSPCChildress, Cottle, Foard, Hardeman, Motley54 min
Mar 13, 7:36 AM CSTMesoscale DiscussionSPCDallam, Hartley, Moore, Oldham, Sherman2 hr
Mar 13, 11:48 AM CSTMesoscale DiscussionSPCBailey, Castro, Cochran, Deaf Smith, Hale, Hockley and 7 more117 min
Mar 13, 12:36 PM CSTTornado WatchSPCBailey, Castro, Cochran, Deaf Smith, Hale, Hockley and 8 more5 hr
Mar 13, 1:52 PM CSTMesoscale DiscussionSPCArmstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 9 more113 min
Mar 13, 2:39 PM CSTMesoscale DiscussionSPCAndrews, Borden, Crane, Crockett, Dawson, Ector and 18 more2 hr
Mar 13, 3:23 PM CSTTornado WatchSPCBorden, Coke, Crane, Crockett, Dawson, Fisher and 18 more6 hr
Mar 13, 3:46 PM CSTMesoscale DiscussionSPCArmstrong, Briscoe, Carson, Donley, Floyd, Hale and 5 more59 min
Mar 13, 4:10 PM CSTMesoscale DiscussionSPCArmstrong, Carson, Hutchinson, Randall65 min
Mar 13, 5:46 PM CSTMesoscale DiscussionSPCArmstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 18 more89 min

Nearby

Tornado Watches in Texas, 2021Every tornado 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.