Alert archive / Texas / Severe Thunderstorm Watches in 2021
Severe Thunderstorm Watch 23
The Storm Prediction Center issued this severe thunderstorm watch at Mar 16, 2021, 10:26 PM CDT for 50 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 16, 2021, 10:26 PM CDT (03:26 UTC)
- Expired
- Mar 17, 2021, 5:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 50 counties
Bell County, TX, Bosque County, TX, Brown County, TX, Callahan County, TX, Coke County, TX, Coleman County, TX, Comanche County, TX, Concho County, TX, Cooke County, TX, Coryell County, TX, Crockett County, TX, Dallas County, TX, Denton County, TX, Eastland County, TX, Ellis County, TX, Erath County, TX, Fisher County, TX, Hamilton County, TX, Haskell County, TX, Hill County, TX, Hood County, TX, Irion County, TX, Jack County, TX, Johnson County, TX, Jones County, TX, Kimble County, TX, Lampasas County, TX, Mason County, TX, McCulloch County, TX, McLennan County, TX, Menard County, TX, Mills County, TX, Montague County, TX, Nolan County, TX, Palo Pinto County, TX, Parker County, TX, Runnels County, TX, San Saba County, TX, Schleicher County, TX, Shackelford County, TX, Somervell County, TX, Stephens County, TX, Sterling County, TX, Sutton County, TX, Tarrant County, TX, Taylor County, TX, Throckmorton County, TX, Tom Green County, TX, Wise County, TX, Young County, TX
The radar
The San Angelo radar (KSJT), 93 km from the middle of the area, began a volume at 03:23 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 17, 12:25 AM CDT | Severe Thunderstorm Warning | SJT | Coke, Irion, Tom Green | 65 min |
| Mar 17, 1:13 AM CDT | Severe Thunderstorm Warning | SJT | Coleman, Concho, Runnels, Tom Green | 47 min |
| Mar 17, 1:59 AM CDT | Severe Thunderstorm Warning | SJT | Brown, Callahan, Coleman, Concho, McCulloch, San Saba | 61 min |
| Mar 17, 2:26 AM CDT | Severe Thunderstorm Warning | FWD | Comanche, Eastland, Erath, Hamilton, Mills | 79 min |
| Mar 17, 3:38 AM CDT | Severe Thunderstorm Warning | FWD | Bosque, Erath, Hill, Hood, Johnson, Somervell | 67 min |
| Mar 17, 3:40 AM CDT | Severe Thunderstorm Warning | FWD | Denton, Parker, Tarrant, Wise | 65 min |
| Mar 17, 4:38 AM CDT | Severe Thunderstorm Warning | FWD | Dallas, Ellis, Hill, Johnson, Tarrant | 82 min |
| Mar 17, 4:57 AM CDT | Severe Thunderstorm Warning | FWD | Falls, Freestone, Hill, Limestone, McLennan, Navarro | 48 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
Fort Worth, TX (KFWD), launched 00:00Z, 3.4 hours before the alert went out and 253 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
- 1277 J/kg
- Mixed-layer CIN
- -111 J/kg
- Mixed-layer LCL
- 1084 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 158 m²/s²
- 0-3 km storm-relative helicity
- 237 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 2.5
The text
As transmitted.
268
WWUS20 KWNS 170323
SEL3
SPC WW 170323
TXZ000-171000-
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 23
NWS Storm Prediction Center Norman OK
1025 PM CDT Tue Mar 16 2021
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Central and North-Central Texas
* Effective this Tuesday night and Wednesday morning from 1025 PM
until 500 AM CDT.
* Primary threats include...
Scattered damaging wind gusts to 70 mph likely
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
A tornado or two possible
SUMMARY...Thunderstorms are expected to develop and intensify along
a cold front pushing into west Texas. These storms will sweep
eastward overnight across the watch area, posing a risk of damaging
winds and hail. Isolated tornadoes are also possible.
The severe thunderstorm watch area is approximately along and 105
statute miles east and west of a line from 25 miles west southwest
of Junction TX to 50 miles north northeast of Mineral Wells TX. For
a complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU3).
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 22...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 450. Mean storm motion vector
25035.
...HartSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 16, 7:49 PM CDT | Severe Thunderstorm Watch | SPC | Collingsworth, Donley, Gray, Hemphill, Lipscomb, Roberts and 1 more | 7 hr |
| Mar 16, 9:27 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Brown, Callahan, Coke, Coleman and 30 more | 93 min |
| Mar 17, 1:32 AM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Gregg, Harrison, Marion and 7 more | 118 min |
| Mar 17, 2:20 AM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coleman, Comanche, Eastland, Erath and 6 more | 85 min |
| Mar 17, 4:04 AM CDT | Mesoscale Discussion | SPC | Anderson, Bowie, Camp, Cass, Cherokee, Collin and 25 more | 86 min |
| Mar 17, 4:37 AM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bowie, Camp, Cass, Cherokee, Collin and 30 more | 5 hr |
| Mar 17, 4:38 AM CDT | Mesoscale Discussion | SPC | Armstrong, Carson, Dallam, Deaf Smith, Gray, Hansford and 11 more | 6 hr |
| Mar 17, 6:40 AM CDT | Mesoscale Discussion | SPC | Anderson, Bowie, Camp, Cass, Cherokee, Delta and 16 more | 95 min |
| Mar 17, 8:43 AM CDT | Tornado Watch | SPC | Angelina, Nacogdoches, Sabine, San Augustine, Shelby | 4 hr |
| Mar 17, 11:35 AM CDT | Mesoscale Discussion | SPC | Angelina, Brazoria, Chambers, Galveston, Hardin, Harris and 10 more | 85 min |
| Mar 17, 11:53 AM CDT | Tornado Watch | SPC | Hardin, Jasper, Jefferson, Newton, Orange, Tyler | 6 hr |
Nearby
Severe Thunderstorm Watches in Texas, 2021Every 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.