Alert archive / Texas / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 36
The Storm Prediction Center issued this severe thunderstorm watch at Feb 19, 2017, 8:36 PM CST for 10 counties in Texas. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 19, 2017, 8:36 PM CST (02:36 UTC)
- Expired
- Feb 20, 2017, 1:00 AM CST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Brooks County, TX, Duval County, TX, Jim Hogg County, TX, Jim Wells County, TX, La Salle County, TX, Live Oak County, TX, McMullen County, TX, Starr County, TX, Webb County, TX, Zapata County, TX
The radar
The Corpus Christi radar (KCRP), 147 km from the middle of the area, began a volume at 02:39 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 19, 8:44 PM CST | Flash Flood Warning | CRP | Webb | 3 hr |
| Feb 19, 8:49 PM CST | Severe Thunderstorm Warning | CRP | Duval, Webb | 30 min |
| Feb 19, 8:56 PM CST | Tornado Warning | CRP | Duval, Webb | 18 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
Corpus Christi, TX (KCRP), launched 00:00Z, 2.6 hours before the alert went out and 164 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
- 1800 J/kg
- Mixed-layer CIN
- -144 J/kg
- Mixed-layer LCL
- 663 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 178 m²/s²
- 0-3 km storm-relative helicity
- 139 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 9.8
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 19, 6:18 PM CST | Severe Thunderstorm Watch | SPC | Atascosa, Bandera, Bastrop, Bexar, Caldwell, Comal and 20 more | 8 hr |
| Feb 19, 6:43 PM CST | Mesoscale Discussion | SPC | Archer, Baylor, Brown, Callahan, Clay, Coleman and 26 more | 2 hr |
| Feb 19, 8:13 PM CST | Mesoscale Discussion | SPC | Bandera, Dimmit, Edwards, Kerr, Kinney, Maverick and 3 more | 2 hr |
| Feb 19, 8:33 PM CST | Mesoscale Discussion | SPC | Bosque, Comanche, Cooke, Coryell, Denton, Erath and 15 more | 117 min |
| Feb 19, 10:28 PM CST | Mesoscale Discussion | SPC | Atascosa, Bexar, Comal, Kendall, McMullen, Wilson | 92 min |
| Feb 19, 11:50 PM CST | Mesoscale Discussion | SPC | Bastrop, Brazos, Burleson, Falls, Fayette, Grimes and 4 more | 85 min |
| Feb 20, 1:56 AM CST | Mesoscale Discussion | SPC | Brazos, Houston, Leon, Madison, Trinity, Walker | 3 hr |
| Feb 20, 4:32 AM CST | Mesoscale Discussion | SPC | Aransas, Calhoun, Cameron, Kenedy, Kleberg, Nueces and 1 more | 3 hr |
Nearby
Severe Thunderstorm Watches in Texas, 2017Every severe thunderstorm watch in 2017
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.