Alert archive / Texas / Tornado Watches in 2017
Tornado Watch 107
The Storm Prediction Center issued this tornado watch at Apr 1, 2017, 10:28 PM CDT for 12 counties in Texas. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 1, 2017, 10:28 PM CDT (03:28 UTC)
- Expired
- Apr 2, 2017, 6:00 AM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 4 in
- Strongest gust expected
- 60 kt
Counties Bandera County, TX, Edwards County, TX, Gillespie County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, Mason County, TX, Medina County, TX, Real County, TX, Sutton County, TX, Uvalde County, TX, Val Verde County, TX
The radar
The Laughlin AFB radar (KDFX), 73 km from the middle of the area, began a volume at 03:28 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
- 30%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 20%
- 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
- 30%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 1, 10:58 PM CDT | Severe Thunderstorm Warning | EWX | Val Verde | 47 min |
| Apr 1, 11:43 PM CDT | Severe Thunderstorm Warning | EWX | Val Verde | 47 min |
| Apr 2, 12:26 AM CDT | Severe Thunderstorm Warning | EWX | Val Verde | 49 min |
| Apr 2, 12:30 AM CDT | Severe Thunderstorm Warning | SJT | Sutton | 45 min |
| Apr 2, 1:15 AM CDT | Severe Thunderstorm Warning | EWX | Val Verde | 45 min |
| Apr 2, 1:32 AM CDT | Flash Flood Warning | EWX | Kinney, Val Verde | 6 hr |
| Apr 2, 2:29 AM CDT | Severe Thunderstorm Warning | EWX | Edwards, Kinney, Val Verde | 32 min |
| Apr 2, 2:57 AM CDT | Severe Thunderstorm Warning | EWX | Edwards, Kinney | 48 min |
| Apr 2, 3:12 AM CDT | Severe Thunderstorm Warning | EWX | Kinney, Val Verde | 48 min |
| Apr 2, 3:20 AM CDT | Tornado Warning | EWX | Kinney | 25 min |
| Apr 2, 3:47 AM CDT | Tornado Warning | EWX | Edwards | 18 min |
| Apr 2, 3:54 AM CDT | Severe Thunderstorm Warning | EWX | Kinney | 51 min |
| Apr 2, 3:56 AM CDT | Tornado Warning | EWX | Edwards, Real | 34 min |
| Apr 2, 4:04 AM CDT | Severe Thunderstorm Warning | EWX | Edwards, Real | 41 min |
| Apr 2, 4:08 AM CDT | Severe Thunderstorm Warning | EWX | Kinney, Maverick | 37 min |
| Apr 2, 4:14 AM CDT | Tornado Warning | EWX | Edwards | 17 min |
| Apr 2, 4:40 AM CDT | Flash Flood Warning | EWX | Edwards, Kinney | 3 hr |
| Apr 2, 4:41 AM CDT | Severe Thunderstorm Warning | EWX | Edwards, Kinney, Maverick | 49 min |
| Apr 2, 5:25 AM CDT | Severe Thunderstorm Warning | EWX | Kinney, Uvalde | 50 min |
| Apr 2, 5:54 AM CDT | Tornado Warning | EWX | Bandera, Kerr, Real | 30 min |
| Apr 2, 5:57 AM CDT | Flash Flood Warning | EWX | Real | 3 hr |
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 (KDLF), launched 00:00Z, 3.5 hours before the alert went out and 73 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
- 564 J/kg
- Mixed-layer CIN
- -71 J/kg
- Mixed-layer LCL
- 2447 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 75 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted.
980
WWUS20 KWNS 020326
SEL7
SPC WW 020326
TXZ000-021100-
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 107
NWS Storm Prediction Center Norman OK
1025 PM CDT Sat Apr 1 2017
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
South-central and southwest Texas
* Effective this Saturday night and Sunday morning from 1025 PM
until 600 AM CDT.
* Primary threats include...
A couple tornadoes possible
Scattered large hail and isolated very large hail events to 4
inches in diameter possible
Isolated damaging wind gusts to 70 mph possible
SUMMARY...At first, a pair of thunderstorms moving out of Mexico
will pose a threat for large, damaging hail and severe gusts. With
time, additional storm development is expected on either side of the
international border, moving into an environment increasingly
favorable for a tornado or two as well. See SPC mesoscale
discussion 396 for initial meteorological reasoning.
The tornado watch area is approximately along and 45 statute miles
either side of a line from 20 miles west northwest of Del Rio TX to
45 miles east southeast of Junction TX. For a complete depiction of
the watch see the associated watch outline update (WOUS64 KWNS
WOU7).
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.
&&
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 4 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 550. Mean
storm motion vector 24025.
...EdwardsSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 1, 7:20 PM CDT | Mesoscale Discussion | SPC | Val Verde | 85 min |
| Apr 1, 8:44 PM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coleman, Comanche, Concho, Eastland and 5 more | 61 min |
| Apr 1, 10:06 PM CDT | Mesoscale Discussion | SPC | Bandera, Bexar, Blanco, Comal, Edwards, Gillespie and 9 more | 114 min |
| Apr 2, 2:53 AM CDT | Mesoscale Discussion | SPC | Bandera, Edwards, Gillespie, Kerr, Kimble, Kinney and 6 more | 82 min |
| Apr 2, 5:16 AM CDT | Mesoscale Discussion | SPC | Anderson, Angelina, Bandera, Bastrop, Bell, Bexar and 51 more | 119 min |
| Apr 2, 6:00 AM CDT | Tornado Watch | SPC | Anderson, Atascosa, Bandera, Bastrop, Bell, Bexar and 51 more | 7 hr |
| Apr 2, 9:04 AM CDT | Mesoscale Discussion | SPC | Angelina, Houston, Jasper, Montgomery, Nacogdoches, Newton and 8 more | 2 hr |
| Apr 2, 9:44 AM CDT | Mesoscale Discussion | SPC | Austin, Bastrop, Brazos, Burleson, Caldwell, Cherokee and 19 more | 2 hr |
| Apr 2, 10:39 AM CDT | Tornado Watch | SPC | Angelina, Austin, Cherokee, Colorado, Gregg, Hardin and 20 more | 5 hr |
| Apr 2, 12:22 PM CDT | Mesoscale Discussion | SPC | Angelina, Nacogdoches, Sabine, San Augustine, Shelby, Trinity | 83 min |
| Apr 2, 1:34 PM CDT | Tornado Watch | SPC | Angelina, Hardin, Jasper, Nacogdoches, Newton, Orange and 4 more | 7 hr |
| Apr 2, 2:06 PM CDT | Mesoscale Discussion | SPC | Sabine | 54 min |
| Apr 2, 4:23 PM CDT | Mesoscale Discussion | SPC | Aransas, Brazoria, Calhoun, Cameron, Jackson, Kenedy and 5 more | 3 hr |
| Apr 2, 5:54 PM CDT | Mesoscale Discussion | SPC | Hardin, Jasper, Newton, Orange | 96 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.