Alert archive / Louisiana / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 379
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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 | Bossier, Caddo | 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, 4:32 AM CDT | Severe Thunderstorm Warning | SHV | Columbia | 58 min |
| Jun 12, 5:13 AM CDT | Severe Thunderstorm Warning | SHV | Union | 62 min |
| Jun 12, 5:52 AM CDT | Severe Thunderstorm Warning | JAN | Ashley | 38 min |
| Jun 12, 6:25 AM CDT | Severe Thunderstorm Warning | SHV | Caldwell, Grant, LaSalle, Natchitoches, Winn | 65 min |
| Jun 12, 6:31 AM CDT | Severe Thunderstorm Warning | JAN | East Carroll, Franklin, Madison, Morehouse, Richland, Tensas and 1 more | 44 min |
| Jun 12, 7:15 AM CDT | Severe Thunderstorm Warning | JAN | East Carroll, Franklin, Madison, Tensas | 30 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.
- 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
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 11, 11:52 PM CDT | Severe Thunderstorm Watch | SPC | Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 15 more | 6 hr |
| Jun 12, 2:54 AM CDT | Mesoscale Discussion | SPC | Calhoun, Clark, Columbia, Dallas, Hempstead, Howard and 8 more | 96 min |
| Jun 12, 6:08 AM CDT | Mesoscale Discussion | SPC | Ashley, Chicot | 2 hr |
| Jun 11, 8:37 PM CDT | Severe Thunderstorm Watch | SPC | Catahoula, Concordia, East Feliciana, Franklin, Saint Helena, Saint Tammany and 4 more | 4 hr |
| Jun 11, 10:51 PM CDT | Mesoscale Discussion | SPC | East Baton Rouge, East Feliciana, Saint Helena, Tangipahoa, Washington, West Baton Rouge and 1 more | 54 min |
| Jun 12, 7:11 AM CDT | Severe Thunderstorm Watch | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 32 more | 8 hr |
| Jun 12, 9:23 AM CDT | Mesoscale Discussion | SPC | Grant, LaSalle, Natchitoches, Sabine | 67 min |
| Jun 12, 12:12 PM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Beauregard, Calcasieu, Cameron, Iberia and 5 more | 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 11, 11:29 PM CDT | Mesoscale Discussion | SPC | Grayson | 61 min |
| Jun 12, 4:08 AM CDT | Mesoscale Discussion | SPC | Armstrong, Bailey, Briscoe, Castro, Childress, Deaf Smith and 9 more | 2 hr |
| Jun 12, 10:32 AM CDT | Mesoscale Discussion | SPC | Archer, Clay, Collin, Cooke, Dallas, Denton and 19 more | 88 min |
| Jun 12, 11:00 AM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bell, Bosque, Brown, Callahan, Collin and 36 more | 6 hr |
| Jun 12, 2:02 PM CDT | Mesoscale Discussion | SPC | Dallam, Deaf Smith, Hartley, Oldham | 88 min |
| Jun 12, 2:16 PM CDT | Severe Thunderstorm Watch | SPC | Dallam, Deaf Smith, Hartley, Oldham | 8 hr |
| 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 |
| Jun 12, 5:42 PM CDT | Mesoscale Discussion | SPC | Dallam | 63 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.