Alert archive / Louisiana / Tornado Watches in 2008
Tornado Watch 133
The Storm Prediction Center issued this tornado watch at Mar 18, 2008, 6:47 PM CDT for Union County, Arkansas; 33 parishes in Louisiana; 18 counties in Texas. It was in force for 9 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 18, 2008, 6:47 PM CDT (23:47 UTC)
- Expired
- Mar 19, 2008, 4:00 AM CDT
- In force
- 9 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 52 counties
Union County, AR, Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Cameron Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Iberia Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Union Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Webster Parish, LA, Winn Parish, LA, Anderson County, TX, Angelina County, TX, Chambers County, TX, Cherokee County, TX, Galveston County, TX, Hardin County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Panola County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Tyler County, TX
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 50%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 80%
- 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
- 10%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 18, 7:49 PM CDT | Severe Thunderstorm Warning | SHV | Cherokee, Rusk, Smith | 41 min |
| Mar 18, 9:17 PM CDT | Severe Thunderstorm Warning | SHV | Harrison, Panola, Rusk | 43 min |
| Mar 18, 10:19 PM CDT | Severe Thunderstorm Warning | SHV | Caddo | 41 min |
| Mar 18, 11:52 PM CDT | Tornado Warning | LCH | Avoyelles, Saint Landry | 23 min |
| Mar 19, 12:13 AM CDT | Tornado Warning | LCH | Avoyelles | 32 min |
| Mar 19, 12:30 AM CDT | Severe Thunderstorm Warning | LCH | Lafayette, Saint Landry, Saint Martin, Vermilion | 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
Lake Charles Mun, LA (KLCH), launched 12:00Z, 11.8 hours before the alert went out and 147 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
- 650 J/kg
- Mixed-layer CIN
- -92 J/kg
- Mixed-layer LCL
- 701 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 463 m²/s²
- 0-3 km storm-relative helicity
- 536 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 7.8
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 17, 7:34 PM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Crawford, Franklin and 11 more | 56 min |
| Mar 17, 9:36 PM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Cleburne, Conway and 20 more | 114 min |
| Mar 17, 10:16 PM CDT | Tornado Watch | SPC | Baxter, Benton, Boone, Carroll, Cleburne, Conway and 31 more | 8 hr |
| Mar 18, 1:13 AM CDT | Mesoscale Discussion | SPC | Washington | 62 min |
| Mar 18, 2:23 AM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Fulton, Madison and 2 more | 2 hr |
| Mar 18, 2:46 AM CDT | Mesoscale Discussion | SPC | Baxter, Cleburne, Conway, Crawford, Faulkner, Franklin and 27 more | 89 min |
| Mar 18, 5:54 AM CDT | Mesoscale Discussion | SPC | Benton, Boone, Carroll, Crawford, Madison, Washington | 2 hr |
| Mar 18, 9:26 AM CDT | Mesoscale Discussion | SPC | Calhoun, Clark, Columbia, Conway, Dallas, Garland and 19 more | 2 hr |
| Mar 18, 10:16 AM CDT | Tornado Watch | SPC | Arkansas, Clark, Clay, Cleburne, Cleveland, Columbia and 48 more | 7 hr |
| Mar 18, 10:59 AM CDT | Tornado Watch | SPC | Union | 8 hr |
| Mar 18, 11:54 AM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Crawford, Franklin and 6 more | 3 hr |
| Mar 18, 12:10 PM CDT | Mesoscale Discussion | SPC | Arkansas, Clark, Cleburne, Cleveland, Conway, Craighead and 47 more | 2 hr |
| Mar 18, 1:51 PM CDT | Mesoscale Discussion | SPC | Polk, Sevier | 3 hr |
| Mar 18, 3:54 PM CDT | Mesoscale Discussion | SPC | Clark, Cleburne, Columbia, Dallas, Faulkner, Garland and 21 more | 2 hr |
| Mar 18, 4:46 PM CDT | Mesoscale Discussion | SPC | Arkansas, Clark, Clay, Craighead, Crittenden, Cross and 19 more | 59 min |
| Mar 18, 5:19 PM CDT | Tornado Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 43 more | 11 hr |
| Mar 18, 6:06 PM CDT | Mesoscale Discussion | SPC | Clark, Clay, Cleburne, Conway, Craighead, Cross and 20 more | 3 hr |
| Mar 18, 6:19 PM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Beauregard, Bienville, Bossier and 22 more | 56 min |
| Mar 17, 7:09 PM CDT | Severe Thunderstorm Watch | SPC | Archer, Baylor, Clay, Wichita, Wilbarger | 7 hr |
| Mar 17, 9:17 PM CDT | Mesoscale Discussion | SPC | Bandera, Blanco, Bosque, Brown, Burnet, Callahan and 53 more | 58 min |
| Mar 17, 10:21 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Clay, Wichita, Wilbarger | 54 min |
| Mar 17, 11:06 PM CDT | Mesoscale Discussion | SPC | Bandera, Blanco, Bosque, Brown, Burnet, Callahan and 53 more | 54 min |
| Mar 18, 1:32 AM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coke, Coleman, Concho, Crockett and 9 more | 58 min |
| Mar 18, 1:43 AM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coke, Coleman, Concho, Crockett and 9 more | 32 min |
| Mar 18, 1:52 AM CDT | Tornado Watch | SPC | Bandera, Blanco, Bosque, Brown, Burnet, Callahan and 34 more | 7 hr |
| Mar 18, 4:57 AM CDT | Mesoscale Discussion | SPC | Bandera, Blanco, Burnet, Coryell, Gillespie, Hamilton and 7 more | 93 min |
| Mar 18, 7:22 AM CDT | Mesoscale Discussion | SPC | Anderson, Austin, Bastrop, Bell, Brazoria, Brazos and 40 more | 113 min |
| Mar 18, 7:50 AM CDT | Mesoscale Discussion | SPC | Bandera, Bosque, Brown, Burnet, Coleman, Comanche and 19 more | 55 min |
| Mar 18, 1:19 PM CDT | Mesoscale Discussion | SPC | Anderson, Austin, Bastrop, Bell, Brazos, Burleson and 37 more | 116 min |
Nearby
Tornado Watches in Louisiana, 2008Tornado Watches in Texas, 2008Tornado Watches in Arkansas, 2008Every tornado watch in 2008
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.