Alert archive / Texas / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 365

May 24, 201113 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at May 24, 2011, 11:22 PM CDT for 13 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: May 24, 2011, 11:22 PM CDT (04:22 UTC)
Expired: May 25, 2011, 4:00 AM CDT
In force: 5 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

Counties Anderson County, TX, Bell County, TX, Coryell County, TX, Falls County, TX, Freestone County, TX, Henderson County, TX, Lampasas County, TX, Leon County, TX, Limestone County, TX, McLennan County, TX, Milam County, TX, Navarro County, TX, Robertson County, TX

The radar

The Ft Hood radar (KGRK), 101 km from the middle of the area, began a volume at 04:25 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: 5%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 20%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 24, 11:28 PM CDT	Severe Thunderstorm Warning	FWD	Bosque, McLennan	62 min
May 24, 11:46 PM CDT	Severe Thunderstorm Warning	FWD	Henderson	59 min
May 25, 12:14 AM CDT	Severe Thunderstorm Warning	FWD	Lampasas	26 min
May 25, 1:01 AM CDT	Severe Thunderstorm Warning	FWD	Bell	59 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

Fort Worth, TX (KFWD), launched 00:00Z, 4.4 hours before the alert went out and 146 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: 2867 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1457 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 357 m²/s²
0-3 km storm-relative helicity: 602 m²/s²
Significant tornado parameter: 6.2
Supercell composite: 44.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 24, 7:42 PM CDT	Mesoscale Discussion	SPC	Bowie, Franklin, Red River, Titus	63 min
May 24, 8:05 PM CDT	Tornado Watch	SPC	Bowie, Camp, Cass, Delta, Fannin, Franklin and 15 more	7 hr
May 24, 11:00 PM CDT	Mesoscale Discussion	SPC	Anderson, Bell, Burnet, Coryell, Falls, Freestone and 6 more	60 min
May 24, 11:24 PM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Franklin, Hopkins, Marion and 5 more	96 min
May 25, 3:10 AM CDT	Mesoscale Discussion	SPC	Bastrop, Bell, Blanco, Brazos, Burleson, Burnet and 8 more	95 min
May 25, 1:53 PM CDT	Mesoscale Discussion	SPC	Anderson, Bowie, Camp, Cass, Cherokee, Gregg and 10 more	2 hr
May 25, 3:16 PM CDT	Tornado Watch	SPC	Angelina, Cass, Cherokee, Gregg, Harrison, Marion and 6 more	7 hr
May 25, 5:15 PM CDT	Mesoscale Discussion	SPC	Anderson, Austin, Bastrop, Brazos, Burleson, Caldwell and 23 more	60 min

Nearby

Severe Thunderstorm Watches in Texas, 2011 Every severe thunderstorm watch in 2011

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.