Alert archive / Texas / Severe Thunderstorm Watches in 2013

Severe Thunderstorm Watch 76

March 31, 201310 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Mar 31, 2013, 6:20 PM CDT for 10 counties in Texas. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Mar 31, 2013, 6:20 PM CDT (23:20 UTC)
Expired: Mar 31, 2013, 9:50 PM CDT
In force: 4 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

Counties Bee County, TX, Duval County, TX, Jim Wells County, TX, Kleberg County, TX, La Salle County, TX, Live Oak County, TX, McMullen County, TX, Nueces County, TX, San Patricio County, TX, Webb County, TX

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: 30%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 50%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Mar 31, 6:42 PM CDT	Severe Thunderstorm Warning	CRP	La Salle, McMullen	48 min
Mar 31, 7:11 PM CDT	Severe Thunderstorm Warning	CRP	Duval, Jim Wells	49 min
Mar 31, 7:25 PM CDT	Severe Thunderstorm Warning	CRP	La Salle, McMullen	50 min
Mar 31, 7:45 PM CDT	Severe Thunderstorm Warning	CRP	Duval	45 min
Mar 31, 8:00 PM CDT	Severe Thunderstorm Warning	CRP	Jim Wells	30 min
Mar 31, 8:16 PM CDT	Severe Thunderstorm Warning	CRP	Duval, Jim Wells	44 min
Mar 31, 8:16 PM CDT	Severe Thunderstorm Warning	CRP	La Salle, Webb	59 min
Mar 31, 8:51 PM CDT	Severe Thunderstorm Warning	CRP	Duval, Jim Wells, Kleberg	39 min
Mar 31, 9:28 PM CDT	Severe Thunderstorm Warning	CRP	Duval, Jim Wells	17 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 12:00Z, 11.3 hours before the alert went out and 145 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 182 J/kg
Mixed-layer CIN: -413 J/kg
Mixed-layer LCL: 865 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 6 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 30, 8:14 PM CDT	Mesoscale Discussion	SPC	Clay, Montague, Wichita, Wilbarger	91 min
Mar 31, 1:13 AM CDT	Mesoscale Discussion	SPC	Wheeler	62 min
Mar 31, 4:54 AM CDT	Mesoscale Discussion	SPC	Clay, Collin, Cooke, Delta, Denton, Fannin and 8 more	96 min
Mar 31, 5:10 AM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bosque, Bowie, Camp, Cass, Cherokee and 44 more	7 hr
Mar 31, 7:36 AM CDT	Mesoscale Discussion	SPC	Anderson, Bowie, Camp, Cass, Cherokee, Collin and 34 more	114 min
Mar 31, 9:20 AM CDT	Severe Thunderstorm Watch	SPC	Angelina, Sabine, San Augustine	5 hr
Mar 31, 10:33 AM CDT	Mesoscale Discussion	SPC	Anderson, Cherokee, Gregg, Harrison, Nacogdoches, Panola and 2 more	57 min
Mar 31, 11:54 AM CDT	Mesoscale Discussion	SPC	Angelina, Jasper, Newton, Sabine, San Augustine, Shelby and 1 more	36 min
Mar 31, 12:17 PM CDT	Severe Thunderstorm Watch	SPC	Angelina, Hardin, Houston, Jasper, Newton, Polk and 5 more	6 hr
Mar 31, 1:00 PM CDT	Mesoscale Discussion	SPC	Austin, Bandera, Bastrop, Bexar, Blanco, Brazos and 32 more	60 min
Mar 31, 1:17 PM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Austin, Bandera, Bastrop, Bell, Bexar and 47 more	9 hr
Mar 31, 2:32 PM CDT	Mesoscale Discussion	SPC	Angelina, Hardin, Jasper, Liberty, Nacogdoches, Newton and 8 more	58 min
Mar 31, 2:48 PM CDT	Severe Thunderstorm Watch	SPC	Brazoria, Chambers, Colorado, Fort Bend, Galveston, Harris and 4 more	5 hr
Mar 31, 5:24 PM CDT	Mesoscale Discussion	SPC	Atascosa, Brazoria, Chambers, DeWitt, Dimmit, Fort Bend and 18 more	96 min

Nearby

Severe Thunderstorm Watches in Texas, 2013 Every 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.