Alert archive / Texas / Tornado Watches in 2021
Tornado Watch 20
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 13, 3:12 PM CST | Severe Thunderstorm Warning | AMA | Armstrong, Randall | 63 min |
| Mar 13, 3:50 PM CST | Tornado Warning | AMA | Armstrong, Randall | 40 min |
| Mar 13, 4:00 PM CST | Tornado Warning | AMA | Armstrong, Randall | 45 min |
| Mar 13, 4:21 PM CST | Tornado Warning | AMA | Armstrong, Carson | 39 min |
| Mar 13, 4:28 PM CST | Tornado Warning | LUB | Briscoe, Floyd, Hale, Swisher | 32 min |
| Mar 13, 4:30 PM CST | Severe Thunderstorm Warning | AMA | Hansford, Hutchinson, Moore, Sherman | 60 min |
| Mar 13, 4:35 PM CST | Tornado Warning | LUB | Crosby, Floyd | 25 min |
| Mar 13, 4:42 PM CST | Tornado Warning | AMA | Armstrong, Carson, Donley, Gray | 48 min |
| Mar 13, 4:43 PM CST | Severe Thunderstorm Warning | LUB | Garza, Lynn | 32 min |
| Mar 13, 4:51 PM CST | Tornado Warning | LUB | Floyd | 24 min |
| Mar 13, 4:52 PM CST | Tornado Warning | AMA | Carson, Gray | 38 min |
| Mar 13, 4:55 PM CST | Tornado Warning | LUB | Briscoe | 35 min |
| Mar 13, 4:56 PM CST | Severe Thunderstorm Warning | LUB | Crosby | 34 min |
| Mar 13, 5:11 PM CST | Tornado Warning | LUB | Floyd, Motley | 34 min |
| Mar 13, 5:14 PM CST | Tornado Warning | AMA | Armstrong, Donley | 46 min |
| Mar 13, 5:14 PM CST | Severe Thunderstorm Warning | LUB | Garza, Lynn | 46 min |
| Mar 13, 5:20 PM CST | Tornado Warning | LUB | Briscoe | 25 min |
| Mar 13, 5:26 PM CST | Severe Thunderstorm Warning | LUB | Garza | 34 min |
| Mar 13, 5:30 PM CST | Severe Thunderstorm Warning | LUB | Crosby, Dickens | 45 min |
| Mar 13, 5:39 PM CST | Tornado Warning | LUB | Floyd, Motley | 36 min |
| Mar 13, 5:43 PM CST | Tornado Warning | AMA | Donley | 47 min |
| Mar 13, 5:54 PM CST | Severe Thunderstorm Warning | LUB | Crosby, Dickens, Motley | 36 min |
| Mar 13, 6:16 PM CST | Severe Thunderstorm Warning | LUB | Hall | 12 min |
| Mar 13, 6:23 PM CST | Tornado Warning | AMA | Collingsworth, Donley, Gray, Wheeler | 37 min |
| Mar 13, 6:28 PM CST | Severe Thunderstorm Warning | LUB | Cottle, Dickens, King, Motley | 47 min |
| Mar 13, 6:47 PM CST | Tornado Warning | LUB | Cottle, Motley | 28 min |
| Mar 13, 6:52 PM CST | Tornado Warning | AMA | Gray, Hemphill, Roberts, Wheeler | 38 min |
| Mar 13, 7:03 PM CST | Severe Thunderstorm Warning | AMA | Armstrong, Carson, Donley, Gray, Roberts | 57 min |
| Mar 13, 7:11 PM CST | Severe Thunderstorm Warning | LUB | Childress, Cottle | 49 min |
| Mar 13, 7:52 PM CST | Severe Thunderstorm Warning | AMA | Gray, Hemphill, Lipscomb, Roberts, Wheeler | 83 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
- Mesoscale Discussion 163 Severe potential...watch likely
- Mesoscale Discussion 165 Severe potential...tornado watch likely
- Mesoscale Discussion 166 Severe potential...watch likely
- Mesoscale Discussion 167 Tornado watch 19...20
- Mesoscale Discussion 168 Tornado watch 19
- Mesoscale Discussion 169 Tornado watch 20
- Mesoscale Discussion 173 Tornado watch 20...21
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.
- 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
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.
...GramsSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 12, 8:11 PM CST | Mesoscale Discussion | SPC | Baylor, Briscoe, Childress, Cottle, Crosby, Dickens and 18 more | 64 min |
| Mar 12, 8:38 PM CST | Severe Thunderstorm Watch | SPC | Armstrong, Baylor, Briscoe, Carson, Childress, Cochran and 29 more | 5 hr |
| Mar 12, 11:08 PM CST | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Castro, Childress, Collingsworth and 26 more | 2 hr |
| Mar 13, 1:06 AM CST | Mesoscale Discussion | SPC | Childress, Cottle, Foard, Hardeman, Motley | 54 min |
| Mar 13, 7:36 AM CST | Mesoscale Discussion | SPC | Dallam, Hartley, Moore, Oldham, Sherman | 2 hr |
| Mar 13, 11:48 AM CST | Mesoscale Discussion | SPC | Bailey, Castro, Cochran, Deaf Smith, Hale, Hockley and 7 more | 117 min |
| Mar 13, 12:36 PM CST | Tornado Watch | SPC | Bailey, Castro, Cochran, Deaf Smith, Hale, Hockley and 8 more | 5 hr |
| Mar 13, 1:52 PM CST | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 9 more | 113 min |
| Mar 13, 2:39 PM CST | Mesoscale Discussion | SPC | Andrews, Borden, Crane, Crockett, Dawson, Ector and 18 more | 2 hr |
| Mar 13, 3:23 PM CST | Tornado Watch | SPC | Borden, Coke, Crane, Crockett, Dawson, Fisher and 18 more | 6 hr |
| Mar 13, 3:46 PM CST | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Donley, Floyd, Hale and 5 more | 59 min |
| Mar 13, 4:10 PM CST | Mesoscale Discussion | SPC | Armstrong, Carson, Hutchinson, Randall | 65 min |
| Mar 13, 5:46 PM CST | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 18 more | 89 min |
Nearby
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.