Alert archive / Texas / Tornado Watches in 2021
Tornado Watch 100
The Storm Prediction Center issued this tornado watch at Apr 23, 2021, 3:14 PM CDT for 8 counties in Oklahoma; 13 counties in Texas. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 23, 2021, 3:14 PM CDT (20:14 UTC)
- Expired
- Apr 23, 2021, 8:02 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3.5 in
- Strongest gust expected
- 60 kt
All 21 counties
Comanche County, OK, Cotton County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Jefferson County, OK, Kiowa County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Childress County, TX, Clay County, TX, Collingsworth County, TX, Cottle County, TX, Foard County, TX, Hardeman County, TX, King County, TX, Knox County, TX, Stonewall County, TX, Wichita County, TX, Wilbarger County, TX
The radar
The Altus AFB radar (KFDR), 35 km from the middle of the area, began a volume at 20:14 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
- 50%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 90%
- One or more hailstones of 2 inches or more
- 70%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
22 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 23, 3:51 PM CDT | Severe Thunderstorm Warning | LUB | Childress, Cottle, Hall | 54 min |
| Apr 23, 4:10 PM CDT | Tornado Warning | LUB | Childress, Cottle | 35 min |
| Apr 23, 4:44 PM CDT | Severe Thunderstorm Warning | LUB | Childress, Cottle | 31 min |
| Apr 23, 4:44 PM CDT | Severe Thunderstorm Warning | OUN | Foard, Hardeman | 46 min |
| Apr 23, 5:17 PM CDT | Severe Thunderstorm Warning | OUN | Foard, Knox | 43 min |
| Apr 23, 5:23 PM CDT | Severe Thunderstorm Warning | OUN | Baylor, Knox | 52 min |
| Apr 23, 5:28 PM CDT | Severe Thunderstorm Warning | LUB | Childress, Hall | 62 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, 5:42 PM CDT | Tornado Warning | LUB | Childress, Cottle, Hall, Motley | 33 min |
| Apr 23, 5:52 PM CDT | Severe Thunderstorm Warning | OUN | Baylor, Foard, Wilbarger | 38 min |
| Apr 23, 5:59 PM CDT | Tornado Warning | 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 | OUN | Foard, Hardeman, Wilbarger | 42 min |
| Apr 23, 6:30 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Cotton, Kiowa, Tillman | 45 min |
| Apr 23, 6:43 PM CDT | Tornado Warning | OUN | Wilbarger | 32 min |
| Apr 23, 6:57 PM CDT | Severe Thunderstorm Warning | OUN | Archer, Wichita | 19 min |
| Apr 23, 7:01 PM CDT | Severe Thunderstorm Warning | OUN | Wichita, Wilbarger | 44 min |
| Apr 23, 7:06 PM CDT | Severe Thunderstorm Warning | OUN | Harmon, Jackson | 39 min |
| Apr 23, 7:32 PM CDT | Severe Thunderstorm Warning | OUN | Archer, Baylor, Wichita, Wilbarger | 43 min |
| Apr 23, 7:44 PM CDT | Severe Thunderstorm Warning | OUN | Archer, Wichita | 46 min |
| Apr 23, 7:52 PM CDT | Severe Thunderstorm Warning | OUN | Cotton | 37 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
Norman, OK (KOUN), launched 12:00Z, 8.2 hours before the alert went out and 203 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 751 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 284 m²/s²
- 0-3 km storm-relative helicity
- 202 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
836
WWUS20 KWNS 232010
SEL0
SPC WW 232010
OKZ000-TXZ000-240200-
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 100
NWS Storm Prediction Center Norman OK
315 PM CDT Fri Apr 23 2021
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Southwest Oklahoma
Western North Texas
* Effective this Friday afternoon and evening from 315 PM until
900 PM CDT.
* Primary threats include...
A few tornadoes possible
Widespread large hail and isolated very large hail events to 3.5
inches in diameter likely
Scattered damaging wind gusts to 70 mph likely
SUMMARY...Isolated supercell thunderstorms are expected to develop
across the watch area this afternoon and early evening. Very large
hail and damaging winds are the main threats, but the most intense
cells may also pose a risk of tornadoes.
The tornado watch area is approximately along and 60 statute miles
north and south of a line from 20 miles south southwest of Childress
TX to 45 miles east northeast of Wichita Falls 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 98...WW 99...
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 3.5 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 24035.
...HartSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 23, 11:29 AM CDT | Mesoscale Discussion | SPC | Carter, Jefferson, Love, Marshall | 91 min |
| Apr 23, 12:37 PM CDT | Severe Thunderstorm Watch | SPC | Bryan, Carter, Cotton, Jefferson, Johnston, Love and 3 more | 7 hr |
| Apr 23, 5:26 PM CDT | Mesoscale Discussion | SPC | Cotton, Jackson, Tillman | 2 hr |
| Apr 23, 12:43 PM CDT | Mesoscale Discussion | SPC | Baylor, Childress, Collingsworth, Cottle, Foard, Hall and 2 more | 3 hr |
| Apr 23, 12:43 PM CDT | Mesoscale Discussion | SPC | Anderson, Angelina, Brazoria, Chambers, Cherokee, Fort Bend and 25 more | 2 hr |
| Apr 23, 2:00 PM CDT | Tornado Watch | SPC | Angelina, Austin, Brazos, Burleson, Chambers, Cherokee and 22 more | 7 hr |
| Apr 23, 3:27 PM CDT | Mesoscale Discussion | SPC | Baylor, Foard, Hardeman, Wilbarger | 2 hr |
| Apr 23, 3:28 PM CDT | Mesoscale Discussion | SPC | Bosque, Brown, Comanche, Eastland, Erath, Hamilton and 11 more | 2 hr |
| Apr 23, 5:36 PM CDT | Mesoscale Discussion | SPC | Angelina, Houston, Jasper, Nacogdoches, Newton, Polk and 7 more | 54 min |
| Apr 23, 6:46 PM CDT | Mesoscale Discussion | SPC | Atascosa, Bell, Bexar, Blanco, Bosque, Burnet and 19 more | 89 min |
Nearby
Tornado Watches in Texas, 2021Tornado Watches in Oklahoma, 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.