Alert archive / Arkansas / Severe Thunderstorm Watches in 2012

Severe Thunderstorm Watch 378

June 11, 201221 counties in Arkansas; McCurtain County, Oklahoma; 20 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Jun 11, 2012, 11:52 PM CDT for 21 counties in Arkansas; McCurtain County, Oklahoma; 20 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jun 11, 2012, 11:52 PM CDT (04:52 UTC)
Expired: Jun 12, 2012, 6:00 AM CDT
In force: 6 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

All 42 counties

Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Polk County, AR, Sevier County, AR, Union County, AR, McCurtain County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Collin County, TX, Delta County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Gregg County, TX, Harrison County, TX, Hopkins County, TX, Hunt County, TX, Lamar County, TX, Marion County, TX, Morris County, TX, Red River County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Wood County, TX

The radar

The Western Arkansas radar (KSRX), 178 km from the middle of the area, began a volume at 04:55 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: 20%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 20%
Six or more combined severe hail and wind reports: 60%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 12, 12:22 AM CDT	Severe Thunderstorm Warning	LZK	Calhoun, Ouachita	38 min
Jun 12, 12:44 AM CDT	Severe Thunderstorm Warning	FWD	Fannin, Hunt	46 min
Jun 12, 12:57 AM CDT	Severe Thunderstorm Warning	LZK	Bradley, Calhoun	20 min
Jun 12, 1:02 AM CDT	Severe Thunderstorm Warning	FWD	Delta, Hopkins, Lamar	58 min
Jun 12, 1:31 AM CDT	Flash Flood Warning	LZK	Garland, Hot Spring, Montgomery	3 hr
Jun 12, 1:44 AM CDT	Severe Thunderstorm Warning	LZK	Garland, Hot Spring, Montgomery	46 min
Jun 12, 1:56 AM CDT	Severe Thunderstorm Warning	SHV	Franklin, Wood	64 min
Jun 12, 2:01 AM CDT	Severe Thunderstorm Warning	FWD	Hopkins	44 min
Jun 12, 2:20 AM CDT	Severe Thunderstorm Warning	SHV	McCurtain	55 min
Jun 12, 2:22 AM CDT	Severe Thunderstorm Warning	LZK	Calhoun, Clark, Dallas, Ouachita	38 min
Jun 12, 2:22 AM CDT	Severe Thunderstorm Warning	SHV	Miller	53 min
Jun 12, 2:31 AM CDT	Severe Thunderstorm Warning	SHV	Columbia, Nevada	59 min
Jun 12, 2:36 AM CDT	Severe Thunderstorm Warning	SHV	Camp, Cass, Morris, Titus	54 min
Jun 12, 2:54 AM CDT	Severe Thunderstorm Warning	LZK	Calhoun, Dallas, Ouachita	41 min
Jun 12, 2:56 AM CDT	Flash Flood Warning	LZK	Montgomery, Pike, Polk, Scott, Yell	4 hr
Jun 12, 3:35 AM CDT	Severe Thunderstorm Warning	SHV	Cass, Gregg, Harrison, Marion	55 min
Jun 12, 3:57 AM CDT	Severe Thunderstorm Warning	SHV	Harrison, Marion, Panola	63 min
Jun 12, 4:10 AM CDT	Severe Thunderstorm Warning	SHV	Union	65 min
Jun 12, 4:19 AM CDT	Severe Thunderstorm Warning	SHV	Columbia, Lafayette	56 min
Jun 12, 4:24 AM CDT	Flash Flood Warning	LZK	Garland, Hot Spring, Montgomery	2 hr
Jun 12, 4:32 AM CDT	Severe Thunderstorm Warning	SHV	Columbia	58 min
Jun 12, 5:13 AM CDT	Severe Thunderstorm Warning	SHV	Union	62 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

Shreveport, LA (KSHV), launched 00:00Z, 4.9 hours before the alert went out and 193 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: 2755 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 1712 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: -42 m²/s²
0-3 km storm-relative helicity: 76 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
Jun 11, 7:33 PM CDT	Mesoscale Discussion	SPC	Ashley, Chicot, Drew	57 min
Jun 11, 9:25 PM CDT	Severe Thunderstorm Watch	SPC	Sebastian	7 hr
Jun 12, 2:54 AM CDT	Mesoscale Discussion	SPC	Calhoun, Clark, Columbia, Dallas, Hempstead, Howard and 8 more	96 min
Jun 12, 3:21 AM CDT	Severe Thunderstorm Watch	SPC	Ashley, Chicot, Columbia, Hempstead, Lafayette, Little River and 3 more	8 hr
Jun 12, 6:08 AM CDT	Mesoscale Discussion	SPC	Ashley, Chicot	2 hr
Jun 11, 7:38 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Haskell and 13 more	67 min
Jun 11, 11:29 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Choctaw, Coal, Haskell, Johnston and 8 more	61 min
Jun 12, 10:32 AM CDT	Mesoscale Discussion	SPC	Carter, Cotton, Jefferson, Love, Marshall, Murray and 1 more	88 min
Jun 12, 2:02 PM CDT	Mesoscale Discussion	SPC	Cimarron	88 min
Jun 12, 2:16 PM CDT	Severe Thunderstorm Watch	SPC	Cimarron	8 hr
Jun 12, 5:42 PM CDT	Mesoscale Discussion	SPC	Cimarron	63 min
Jun 11, 7:11 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Clay, Coke, Coleman, Collin and 29 more	94 min
Jun 11, 9:54 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Brown, Callahan, Clay, Coke and 31 more	66 min
Jun 12, 4:08 AM CDT	Mesoscale Discussion	SPC	Armstrong, Bailey, Briscoe, Castro, Childress, Deaf Smith and 9 more	2 hr
Jun 12, 7:11 AM CDT	Severe Thunderstorm Watch	SPC	Hardin, Jasper, Jefferson, Newton, Orange, Tyler	8 hr
Jun 12, 9:23 AM CDT	Mesoscale Discussion	SPC	Nacogdoches, Sabine, San Augustine, Shelby	67 min
Jun 12, 11:00 AM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bell, Bosque, Brown, Callahan, Collin and 36 more	6 hr
Jun 12, 12:12 PM CDT	Mesoscale Discussion	SPC	Chambers, Hardin, Jasper, Jefferson, Newton, Orange and 1 more	63 min
Jun 12, 2:45 PM CDT	Mesoscale Discussion	SPC	Coke, Coleman, Concho, Glasscock, Midland, Mitchell and 4 more	60 min
Jun 12, 3:00 PM CDT	Mesoscale Discussion	SPC	Andrews, Bailey, Cochran, Crane, Ector, Gaines and 7 more	60 min
Jun 12, 3:28 PM CDT	Mesoscale Discussion	SPC	Anderson, Bell, Bosque, Brazos, Brown, Burleson and 37 more	62 min
Jun 12, 3:44 PM CDT	Severe Thunderstorm Watch	SPC	Andrews, Bailey, Cochran, Crane, Culberson, Ector and 13 more	8 hr
Jun 12, 3:56 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Austin, Bell, Brazoria, Brazos, Burleson and 24 more	4 hr

Nearby

Severe Thunderstorm Watches in Arkansas, 2012 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.