Alert archive / Louisiana / Severe Thunderstorm Watches in 2012

Severe Thunderstorm Watch 379

June 12, 20129 counties in Arkansas; 26 parishes in Louisiana; 14 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Jun 12, 2012, 3:21 AM CDT for 9 counties in Arkansas; 26 parishes in Louisiana; 14 counties in Texas. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Jun 12, 2012, 3:21 AM CDT (08:21 UTC)
Expired
Jun 12, 2012, 11:00 AM CDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 49 counties

Ashley County, AR, Chicot County, AR, Columbia County, AR, Hempstead County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, Concordia Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Bowie County, TX, Cass County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX, Upshur County, TX

The radar

The Shreveport radar (KSHV), 50 km from the middle of the area, began a volume at 08:22 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
40%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
20%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 12, 3:35 AM CDTSevere Thunderstorm WarningSHVCass, Gregg, Harrison, Marion55 min
Jun 12, 3:57 AM CDTSevere Thunderstorm WarningSHVBossier, Caddo63 min
Jun 12, 4:10 AM CDTSevere Thunderstorm WarningSHVUnion65 min
Jun 12, 4:19 AM CDTSevere Thunderstorm WarningSHVColumbia, Lafayette56 min
Jun 12, 4:32 AM CDTSevere Thunderstorm WarningSHVColumbia58 min
Jun 12, 5:13 AM CDTSevere Thunderstorm WarningSHVUnion62 min
Jun 12, 5:52 AM CDTSevere Thunderstorm WarningJANAshley38 min
Jun 12, 6:25 AM CDTSevere Thunderstorm WarningSHVCaldwell, Grant, LaSalle, Natchitoches, Winn65 min
Jun 12, 6:31 AM CDTSevere Thunderstorm WarningJANEast Carroll, Franklin, Madison, Morehouse, Richland, Tensas and 1 more44 min
Jun 12, 7:15 AM CDTSevere Thunderstorm WarningJANEast Carroll, Franklin, Madison, Tensas30 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, 8.4 hours before the alert went out and 41 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-pSkew-T log-p diagram, Shreveport, LA at 00:00Z on 2012-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2755 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 00:00Z on 2012-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -42 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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.

IssuedProductOfficeCountiesLasted
Jun 11, 7:33 PM CDTMesoscale DiscussionSPCAshley, Chicot, Drew57 min
Jun 11, 9:25 PM CDTSevere Thunderstorm WatchSPCSebastian7 hr
Jun 11, 11:52 PM CDTSevere Thunderstorm WatchSPCBradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 15 more6 hr
Jun 12, 2:54 AM CDTMesoscale DiscussionSPCCalhoun, Clark, Columbia, Dallas, Hempstead, Howard and 8 more96 min
Jun 12, 6:08 AM CDTMesoscale DiscussionSPCAshley, Chicot2 hr
Jun 11, 8:37 PM CDTSevere Thunderstorm WatchSPCCatahoula, Concordia, East Feliciana, Franklin, Saint Helena, Saint Tammany and 4 more4 hr
Jun 11, 10:51 PM CDTMesoscale DiscussionSPCEast Baton Rouge, East Feliciana, Saint Helena, Tangipahoa, Washington, West Baton Rouge and 1 more54 min
Jun 12, 7:11 AM CDTSevere Thunderstorm WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 32 more8 hr
Jun 12, 9:23 AM CDTMesoscale DiscussionSPCGrant, LaSalle, Natchitoches, Sabine67 min
Jun 12, 12:12 PM CDTMesoscale DiscussionSPCAcadia, Allen, Beauregard, Calcasieu, Cameron, Iberia and 5 more63 min
Jun 11, 7:11 PM CDTMesoscale DiscussionSPCBrown, Callahan, Clay, Coke, Coleman, Collin and 29 more94 min
Jun 11, 9:54 PM CDTMesoscale DiscussionSPCArcher, Baylor, Brown, Callahan, Clay, Coke and 31 more66 min
Jun 11, 11:29 PM CDTMesoscale DiscussionSPCGrayson61 min
Jun 12, 4:08 AM CDTMesoscale DiscussionSPCArmstrong, Bailey, Briscoe, Castro, Childress, Deaf Smith and 9 more2 hr
Jun 12, 10:32 AM CDTMesoscale DiscussionSPCArcher, Clay, Collin, Cooke, Dallas, Denton and 19 more88 min
Jun 12, 11:00 AM CDTSevere Thunderstorm WatchSPCAnderson, Bell, Bosque, Brown, Callahan, Collin and 36 more6 hr
Jun 12, 2:02 PM CDTMesoscale DiscussionSPCDallam, Deaf Smith, Hartley, Oldham88 min
Jun 12, 2:16 PM CDTSevere Thunderstorm WatchSPCDallam, Deaf Smith, Hartley, Oldham8 hr
Jun 12, 2:45 PM CDTMesoscale DiscussionSPCCoke, Coleman, Concho, Glasscock, Midland, Mitchell and 4 more60 min
Jun 12, 3:00 PM CDTMesoscale DiscussionSPCAndrews, Bailey, Cochran, Crane, Ector, Gaines and 7 more60 min
Jun 12, 3:28 PM CDTMesoscale DiscussionSPCAnderson, Bell, Bosque, Brazos, Brown, Burleson and 37 more62 min
Jun 12, 3:44 PM CDTSevere Thunderstorm WatchSPCAndrews, Bailey, Cochran, Crane, Culberson, Ector and 13 more8 hr
Jun 12, 3:56 PM CDTSevere Thunderstorm WatchSPCAnderson, Austin, Bell, Brazoria, Brazos, Burleson and 24 more4 hr
Jun 12, 5:42 PM CDTMesoscale DiscussionSPCDallam63 min

Nearby

Severe Thunderstorm Watches in Louisiana, 2012Severe Thunderstorm Watches in Texas, 2012Severe Thunderstorm Watches in Arkansas, 2012Every 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.