Alert archive / Texas / Severe Thunderstorm Watches in 2013
Severe Thunderstorm Watch 581
The Storm Prediction Center issued this severe thunderstorm watch at Dec 21, 2013, 10:29 AM CST for 20 counties in Texas. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 21, 2013, 10:29 AM CST (16:29 UTC)
- Expired
- Dec 21, 2013, 1:29 PM CST
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
Counties Aransas County, TX, Atascosa County, TX, Bastrop County, TX, Bee County, TX, Caldwell County, TX, Calhoun County, TX, DeWitt County, TX, Fayette County, TX, Goliad County, TX, Gonzales County, TX, Guadalupe County, TX, Karnes County, TX, La Salle County, TX, Lavaca County, TX, Lee County, TX, Live Oak County, TX, McMullen County, TX, Refugio County, TX, Victoria County, TX, Wilson County, TX
The radar
The Austin/San Antonio radar (KEWX), 70 km from the middle of the area, began a volume at 16:32 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
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 50%
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 12:00Z, 4.5 hours before the alert went out and 161 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
- 867 J/kg
- Mixed-layer CIN
- -194 J/kg
- Mixed-layer LCL
- 568 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 315 m²/s²
- 0-3 km storm-relative helicity
- 319 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 2.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 20, 6:44 PM CST | Mesoscale Discussion | SPC | Bowie, Cass, Morris | 91 min |
| Dec 20, 8:18 PM CST | Mesoscale Discussion | SPC | Hardeman, Wichita, Wilbarger | 6 hr |
| Dec 20, 10:42 PM CST | Mesoscale Discussion | SPC | Anderson, Bowie, Camp, Cass, Cherokee, Freestone and 14 more | 2 hr |
| Dec 21, 2:31 AM CST | Mesoscale Discussion | SPC | Anderson, Angelina, Bowie, Brazos, Cass, Cherokee and 20 more | 2 hr |
| Dec 21, 6:20 AM CST | Mesoscale Discussion | SPC | Bell, Blanco, Bosque, Brown, Burnet, Coleman and 31 more | 115 min |
| Dec 21, 7:57 AM CST | Mesoscale Discussion | SPC | Angelina, Brazoria, Chambers, Fort Bend, Galveston, Hardin and 22 more | 63 min |
| Dec 21, 9:46 AM CST | Tornado Watch | SPC | Angelina, Austin, Brazoria, Brazos, Burleson, Chambers and 33 more | 8 hr |
| Dec 21, 9:53 AM CST | Mesoscale Discussion | SPC | Atascosa, Bastrop, Bee, Bexar, Caldwell, DeWitt and 11 more | 67 min |
| Dec 21, 12:30 PM CST | Mesoscale Discussion | SPC | Angelina, Austin, Brazoria, Chambers, Fort Bend, Galveston and 20 more | 60 min |
Nearby
Severe Thunderstorm Watches in Texas, 2013Every severe thunderstorm watch in 2013
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.