Alert archive / Texas / Tornado Watches in 2020
Tornado Watch 102
The Storm Prediction Center issued this tornado watch at Apr 11, 2020, 8:37 PM CDT for 29 counties in Texas. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 11, 2020, 8:37 PM CDT (01:37 UTC)
- Expired
- Apr 12, 2020, 1:59 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 65 kt
All 29 counties
Atascosa County, TX, Bandera County, TX, Bastrop County, TX, Bexar County, TX, Blanco County, TX, Caldwell County, TX, Comal County, TX, DeWitt County, TX, Dimmit County, TX, Edwards County, TX, Fayette County, TX, Frio County, TX, Gillespie County, TX, Gonzales County, TX, Guadalupe County, TX, Hays County, TX, Karnes County, TX, Kendall County, TX, Kerr County, TX, Kinney County, TX, Lavaca County, TX, Lee County, TX, Maverick County, TX, Medina County, TX, Real County, TX, Travis County, TX, Uvalde County, TX, Wilson County, TX, Zavala County, TX
The radar
The Austin/San Antonio radar (KEWX), 107 km from the middle of the area, began a volume at 01:36 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
- 70%
- One or more EF2 to EF5 tornadoes
- 50%
- Ten or more severe wind reports
- 70%
- One or more gusts of 65 knots or more
- 60%
- Ten or more severe hail reports
- 80%
- One or more hailstones of 2 inches or more
- 70%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 8:58 PM CDT | Tornado Warning | EWX | Kinney, Uvalde | 32 min |
| Apr 11, 9:27 PM CDT | Severe Thunderstorm Warning | EWX | Kinney, Uvalde | 48 min |
| Apr 11, 10:11 PM CDT | Severe Thunderstorm Warning | EWX | Uvalde | 64 min |
| Apr 12, 12:53 AM CDT | Severe Thunderstorm Warning | EWX | Edwards, Val Verde | 67 min |
| Apr 12, 1:53 AM CDT | Severe Thunderstorm Warning | EWX | Edwards, Kerr, Real | 67 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
Del Rio, TX (KDRT), launched 00:00Z, 1.6 hours before the alert went out and 167 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
- 3028 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 1174 m above ground
- 0-6 km bulk shear
- 80 kt
- 0-1 km storm-relative helicity
- 185 m²/s²
- 0-3 km storm-relative helicity
- 286 m²/s²
- Significant tornado parameter
- 4.8
- Supercell composite
- 23.5
The text
As transmitted.
054
WWUS20 KWNS 120135
SEL2
SPC WW 120135
TXZ000-120900-
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 102
NWS Storm Prediction Center Norman OK
840 PM CDT Sat Apr 11 2020
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
South Central Texas
* Effective this Saturday night and Sunday morning from 840 PM
until 400 AM CDT.
* Primary threats include...
A few tornadoes likely with a couple intense tornadoes possible
Widespread large hail and isolated very large hail events to 3
inches in diameter likely
Scattered damaging winds and isolated significant gusts to 75
mph likely
SUMMARY...A few intense supercell thunderstorms are expected to
track eastward across the watch area through the late evening and
overnight hours. Storms will be capable of very large hail and
tornadoes, along with locally damaging wind gusts.
The tornado watch area is approximately along and 45 statute miles
north and south of a line from 85 miles west of Hondo TX to 45 miles
north of Victoria TX. For a complete depiction of the watch see the
associated watch outline update (WOUS64 KWNS WOU2).
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 100...WW 101...
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 3 inches. Extreme turbulence and surface wind
gusts to 65 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 27035.
...HartSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 7:51 PM CDT | Mesoscale Discussion | SPC | Edwards, Kinney, Real, Sutton, Uvalde, Val Verde | 84 min |
| Apr 11, 9:23 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Callahan, Clay, Coke, Coleman and 23 more | 67 min |
| Apr 11, 11:03 PM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Bexar, Caldwell, Comal, DeWitt and 12 more | 57 min |
| Apr 12, 1:37 AM CDT | Mesoscale Discussion | SPC | Bandera, Bell, Blanco, Bosque, Brazos, Brown and 44 more | 113 min |
| Apr 12, 1:59 AM CDT | Tornado Watch | SPC | Bandera, Bastrop, Bell, Bexar, Blanco, Bosque and 37 more | 6 hr |
| Apr 12, 4:15 AM CDT | Mesoscale Discussion | SPC | Bandera, Bastrop, Bell, Blanco, Bosque, Brown and 24 more | 90 min |
| Apr 12, 5:52 AM CDT | Tornado Watch | SPC | Anderson, Angelina, Brazos, Burleson, Cherokee, Freestone and 19 more | 8 hr |
| Apr 12, 7:18 AM CDT | Mesoscale Discussion | SPC | Anderson, Camp, Cass, Cherokee, Falls, Freestone and 20 more | 87 min |
| Apr 12, 9:30 AM CDT | Mesoscale Discussion | SPC | San Augustine, Shelby | 90 min |
| Apr 12, 1:10 PM CDT | Mesoscale Discussion | SPC | Camp, Collin, Cooke, Dallas, Delta, Denton and 17 more | 95 min |
| Apr 12, 2:51 PM CDT | Severe Thunderstorm Watch | SPC | Bowie, Camp, Cass, Delta, Fannin, Franklin and 11 more | 5 hr |
| Apr 12, 6:14 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Franklin, Gregg, Harrison and 8 more | 91 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.