Alert archive / Texas / Severe Thunderstorm Watches in 2012

Severe Thunderstorm Watch 132

April 3, 201211 counties in Oklahoma; 39 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Apr 3, 2012, 9:18 AM CDT for 11 counties in Oklahoma; 39 counties in Texas. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Apr 3, 2012, 9:18 AM CDT (14:18 UTC)
Expired: Apr 3, 2012, 5:00 PM CDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 50 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Coal County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Pushmataha County, OK, Bosque County, TX, Clay County, TX, Collin County, TX, Comanche County, TX, Cooke County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Erath County, TX, Falls County, TX, Fannin County, TX, Freestone County, TX, Grayson County, TX, Hamilton County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Lampasas County, TX, Limestone County, TX, McLennan County, TX, Mills County, TX, Montague County, TX, Navarro County, TX, Palo Pinto County, TX, Parker County, TX, Rains County, TX, Rockwall County, TX, Somervell County, TX, Tarrant County, TX, Van Zandt County, TX, Wise County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 64 km from the middle of the area, began a volume at 14:18 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: 30%
Ten or more severe hail reports: 50%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Apr 3, 9:49 AM CDT	Severe Thunderstorm Warning	FWD	Palo Pinto	41 min
Apr 3, 10:04 AM CDT	Severe Thunderstorm Warning	FWD	Comanche, Eastland, Erath	56 min
Apr 3, 10:24 AM CDT	Severe Thunderstorm Warning	FWD	Jack, Palo Pinto	51 min
Apr 3, 10:51 AM CDT	Severe Thunderstorm Warning	FWD	Erath, Hood, Palo Pinto, Parker	39 min
Apr 3, 11:11 AM CDT	Severe Thunderstorm Warning	FWD	Jack	49 min
Apr 3, 11:28 AM CDT	Severe Thunderstorm Warning	FWD	Parker	28 min
Apr 3, 11:35 AM CDT	Severe Thunderstorm Warning	FWD	Montague	40 min
Apr 3, 11:42 AM CDT	Severe Thunderstorm Warning	FWD	Erath, Palo Pinto	48 min
Apr 3, 11:59 AM CDT	Severe Thunderstorm Warning	FWD	Hood, Parker	61 min
Apr 3, 12:05 PM CDT	Severe Thunderstorm Warning	FWD	Jack	55 min
Apr 3, 12:08 PM CDT	Severe Thunderstorm Warning	FWD	Montague	67 min
Apr 3, 12:18 PM CDT	Severe Thunderstorm Warning	FWD	Johnson	57 min
Apr 3, 12:44 PM CDT	Tornado Warning	FWD	Johnson, Tarrant	46 min
Apr 3, 12:51 PM CDT	Severe Thunderstorm Warning	FWD	Hood, Johnson, Parker, Tarrant	54 min
Apr 3, 12:55 PM CDT	Tornado Warning Emergency	FWD	Dallas, Ellis	50 min
Apr 3, 1:16 PM CDT	Tornado Warning	FWD	Parker, Tarrant	44 min
Apr 3, 1:21 PM CDT	Severe Thunderstorm Warning	FWD	Montague	39 min
Apr 3, 1:25 PM CDT	Tornado Warning Emergency	FWD	Dallas, Tarrant	50 min
Apr 3, 1:26 PM CDT	Tornado Warning Emergency	FWD	Dallas	49 min
Apr 3, 1:28 PM CDT	Severe Thunderstorm Warning	FWD	Bosque	47 min
Apr 3, 1:34 PM CDT	Severe Thunderstorm Warning	FWD	Hood, Johnson, Somervell, Tarrant	41 min
Apr 3, 1:45 PM CDT	Severe Thunderstorm Warning	FWD	Ellis, Johnson	45 min
Apr 3, 1:45 PM CDT	Severe Thunderstorm Warning	FWD	Tarrant	60 min
Apr 3, 1:50 PM CDT	Severe Thunderstorm Warning	FWD	Denton, Wise	40 min
Apr 3, 2:03 PM CDT	Tornado Warning	FWD	Denton	42 min
Apr 3, 2:12 PM CDT	Severe Thunderstorm Warning	FWD	Delta, Hopkins, Hunt	63 min
Apr 3, 2:13 PM CDT	Tornado Warning	FWD	Collin, Dallas, Rockwall	62 min
Apr 3, 2:13 PM CDT	Tornado Warning	FWD	Collin, Dallas, Denton, Tarrant	47 min
Apr 3, 2:15 PM CDT	Severe Thunderstorm Warning	FWD	Bosque, Hill	60 min
Apr 3, 2:19 PM CDT	Severe Thunderstorm Warning	FWD	Dallas, Tarrant	26 min
Apr 3, 2:34 PM CDT	Severe Thunderstorm Warning	FWD	Dallas, Ellis	56 min
Apr 3, 2:37 PM CDT	Severe Thunderstorm Warning	FWD	Hopkins, Rains	68 min
Apr 3, 2:42 PM CDT	Severe Thunderstorm Warning	FWD	Collin, Dallas, Denton, Tarrant	63 min
Apr 3, 2:42 PM CDT	Tornado Warning	FWD	Delta, Hopkins, Hunt	48 min
Apr 3, 2:45 PM CDT	Tornado Warning	FWD	Dallas, Tarrant	17 min
Apr 3, 2:55 PM CDT	Severe Thunderstorm Warning	FWD	Ellis, Hill, Johnson	65 min
Apr 3, 3:03 PM CDT	Severe Thunderstorm Warning	FWD	Bosque, McLennan	42 min
Apr 3, 3:15 PM CDT	Tornado Warning	FWD	Dallas, Kaufman, Rockwall	45 min
Apr 3, 3:20 PM CDT	Severe Thunderstorm Warning	FWD	Bell, Coryell	40 min
Apr 3, 3:25 PM CDT	Tornado Warning	FWD	Delta, Hopkins	50 min
Apr 3, 3:28 PM CDT	Severe Thunderstorm Warning	FWD	Delta, Hopkins, Hunt	62 min
Apr 3, 3:34 PM CDT	Severe Thunderstorm Warning	FWD	Collin, Dallas, Ellis	41 min
Apr 3, 3:44 PM CDT	Severe Thunderstorm Warning	FWD	Hill, McLennan	46 min
Apr 3, 3:50 PM CDT	Tornado Warning	FWD	Collin, Hunt, Rockwall	40 min
Apr 3, 4:02 PM CDT	Severe Thunderstorm Warning	FWD	Kaufman	58 min
Apr 3, 4:02 PM CDT	Severe Thunderstorm Warning	FWD	Lamar	28 min
Apr 3, 4:13 PM CDT	Tornado Warning	FWD	Delta, Hopkins, Lamar	33 min
Apr 3, 4:17 PM CDT	Severe Thunderstorm Warning	FWD	Falls, Hill, Limestone, McLennan, Navarro	43 min
Apr 3, 4:24 PM CDT	Severe Thunderstorm Warning	FWD	Ellis	51 min
Apr 3, 4:27 PM CDT	Tornado Warning Emergency	FWD	Hunt	48 min
Apr 3, 4:31 PM CDT	Severe Thunderstorm Warning	FWD	Hopkins, Rains	44 min
Apr 3, 4:37 PM CDT	Severe Thunderstorm Warning	FWD	Fannin, Hunt	53 min
Apr 3, 4:56 PM CDT	Severe Thunderstorm Warning	FWD	Kaufman, Van Zandt	64 min
Apr 3, 4:56 PM CDT	Tornado Warning	FWD	Delta, Hunt, Lamar	20 min
Apr 3, 4:57 PM CDT	Severe Thunderstorm Warning	FWD	Ellis, Falls, Freestone, Henderson, Hill, Limestone and 3 more	63 min
Apr 3, 5:00 PM CDT	Severe Thunderstorm Warning	FWD	Delta, Hopkins, Lamar, Rains	60 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 12:00Z, 2.3 hours before the alert went out and 36 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: 1939 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 469 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 2.8

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 2, 7:17 PM CDT	Mesoscale Discussion	SPC	Beaver, Ellis, Harper, Roger Mills, Texas	58 min
Apr 2, 9:12 PM CDT	Mesoscale Discussion	SPC	Beaver, Beckham, Caddo, Comanche, Cotton, Custer and 13 more	63 min
Apr 2, 10:51 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Blaine, Caddo, Canadian, Comanche, Cotton and 14 more	5 hr
Apr 3, 1:14 AM CDT	Mesoscale Discussion	SPC	Carter, Cleveland, Comanche, Cotton, Garfield, Garvin and 12 more	2 hr
Apr 3, 3:32 AM CDT	Mesoscale Discussion	SPC	Caddo, Canadian, Comanche, Cotton, Grady, Jefferson and 2 more	88 min
Apr 3, 8:36 AM CDT	Mesoscale Discussion	SPC	Bryan, Carter, Jefferson, Johnston, Love, Marshall and 2 more	84 min
Apr 3, 11:47 AM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Jefferson, Johnston and 3 more	118 min
Apr 3, 2:21 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Johnston, Love and 2 more	84 min
Apr 3, 2:36 PM CDT	Tornado Watch	SPC	McCurtain	7 hr
Apr 3, 3:05 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Johnston and 5 more	85 min
Apr 3, 3:43 PM CDT	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Choctaw, Haskell, Latimer, LeFlore and 3 more	6 hr
Apr 2, 11:45 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coleman, Comanche, Concho, Eastland and 17 more	2 hr
Apr 3, 12:08 PM CDT	Tornado Watch	SPC	Anderson, Bell, Bosque, Collin, Coryell, Dallas and 30 more	9 hr
Apr 3, 1:12 PM CDT	Mesoscale Discussion	SPC	Bosque, Collin, Dallas, Denton, Ellis, Erath and 16 more	93 min
Apr 3, 1:46 PM CDT	Mesoscale Discussion	SPC	Camp, Cass, Cherokee, Franklin, Gregg, Harrison and 9 more	89 min
Apr 3, 4:38 PM CDT	Mesoscale Discussion	SPC	Austin, Bastrop, Brazos, Burleson, Caldwell, Fayette and 10 more	67 min
Apr 3, 5:00 PM CDT	Mesoscale Discussion	SPC	Anderson, Bowie, Camp, Cass, Delta, Falls and 18 more	60 min
Apr 3, 6:53 PM CDT	Mesoscale Discussion	SPC	Anderson, Angelina, Bastrop, Bowie, Brazos, Burleson and 24 more	67 min

Nearby

Severe Thunderstorm Watches in Texas, 2012 Severe Thunderstorm Watches in Oklahoma, 2012 Every severe thunderstorm watch in 2012

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.