Alert archive / Louisiana / Tornado Watches in 2013
Tornado Watch 580
The Storm Prediction Center issued this tornado watch at Dec 21, 2013, 9:46 AM CST for 5 counties in Arkansas; 39 parishes in Louisiana; 39 counties in Texas. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 21, 2013, 9:46 AM CST (15:46 UTC)
- Expired
- Dec 21, 2013, 6:00 PM CST
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 83 counties
Ashley County, AR, Chicot County, AR, Columbia County, AR, Lafayette County, AR, 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, Catahoula Parish, LA, Claiborne Parish, LA, Concordia Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Saint Landry Parish, LA, Tensas Parish, LA, Union Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Angelina County, TX, Austin County, TX, Brazoria County, TX, Brazos County, TX, Burleson County, TX, Chambers County, TX, Cherokee County, TX, Colorado County, TX, Fort Bend County, TX, Galveston County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Harrison County, TX, Houston County, TX, Jackson County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Madison County, TX, Marion County, TX, Matagorda County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Panola County, TX, Polk County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX
The radar
The Lake Charles radar (KLCH), 139 km from the middle of the area, began a volume at 15:46 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
- 50%
- One or more EF2 to EF5 tornadoes
- 40%
- 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
- 10%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
26 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 21, 12:37 PM CST | Severe Thunderstorm Warning | SHV | Bienville, De Soto, Natchitoches, Red River, Sabine, Winn | 53 min |
| Dec 21, 1:08 PM CST | Severe Thunderstorm Warning | SHV | Bienville, Claiborne, Jackson, Lincoln, Natchitoches, Webster | 67 min |
| Dec 21, 1:36 PM CST | Severe Thunderstorm Warning | SHV | Angelina, Nacogdoches, Panola, Rusk, San Augustine, Shelby | 54 min |
| Dec 21, 1:39 PM CST | Severe Thunderstorm Warning | SHV | Union | 66 min |
| Dec 21, 2:11 PM CST | Severe Thunderstorm Warning | SHV | De Soto, Natchitoches, Sabine | 64 min |
| Dec 21, 2:49 PM CST | Severe Thunderstorm Warning | LCH | Beauregard, Vernon | 56 min |
| Dec 21, 2:52 PM CST | Severe Thunderstorm Warning | SHV | Bienville, Claiborne, De Soto, Natchitoches, Red River, Webster | 53 min |
| Dec 21, 3:14 PM CST | Severe Thunderstorm Warning | SHV | Union | 61 min |
| Dec 21, 3:17 PM CST | Severe Thunderstorm Warning | SHV | Grant, Jackson, Natchitoches, Red River, Sabine, Winn | 58 min |
| Dec 21, 3:26 PM CST | Tornado Warning | SHV | Jackson, Lincoln, Ouachita, Union | 49 min |
| Dec 21, 3:44 PM CST | Severe Thunderstorm Warning | SHV | Union | 61 min |
| Dec 21, 3:52 PM CST | Severe Thunderstorm Warning | SHV | Grant, Jackson, Natchitoches, Winn | 53 min |
| Dec 21, 3:55 PM CST | Severe Thunderstorm Warning | JAN | Ashley | 80 min |
| Dec 21, 4:09 PM CST | Tornado Warning | JAN | Ashley | 36 min |
| Dec 21, 4:11 PM CST | Severe Thunderstorm Warning | JAN | Franklin, Richland | 49 min |
| Dec 21, 4:13 PM CST | Tornado Warning | JAN | Ashley | 32 min |
| Dec 21, 4:14 PM CST | Severe Thunderstorm Warning | SHV | Caldwell, Grant, Jackson, LaSalle, Ouachita, Winn | 61 min |
| Dec 21, 4:33 PM CST | Tornado Warning | LCH | Rapides, Vernon | 27 min |
| Dec 21, 4:38 PM CST | Severe Thunderstorm Warning | JAN | Chicot | 52 min |
| Dec 21, 4:42 PM CST | Severe Thunderstorm Warning | JAN | East Carroll, West Carroll | 63 min |
| Dec 21, 4:48 PM CST | Tornado Warning | JAN | Chicot | 27 min |
| Dec 21, 4:58 PM CST | Severe Thunderstorm Warning | JAN | Franklin, Madison, Richland | 62 min |
| Dec 21, 4:58 PM CST | Tornado Warning | LCH | Rapides | 32 min |
| Dec 21, 5:06 PM CST | Severe Thunderstorm Warning | JAN | Chicot | 39 min |
| Dec 21, 5:14 PM CST | Severe Thunderstorm Warning | JAN | Catahoula, Franklin | 61 min |
| Dec 21, 5:17 PM CST | Tornado Warning | JAN | East Carroll | 43 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, 3.8 hours before the alert went out and 140 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
- 509 J/kg
- Mixed-layer CIN
- -112 J/kg
- Mixed-layer LCL
- 558 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 165 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 0.7
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 20, 6:44 PM CST | Mesoscale Discussion | SPC | Clark, Dallas, Garland, Grant, Hempstead, Hot Spring and 11 more | 91 min |
| Dec 20, 8:18 PM CST | Mesoscale Discussion | SPC | Benton | 6 hr |
| Dec 20, 10:42 PM CST | Mesoscale Discussion | SPC | Miller | 2 hr |
| Dec 21, 2:31 AM CST | Mesoscale Discussion | SPC | Clark, Clay, Cleburne, Columbia, Conway, Craighead and 30 more | 2 hr |
| Dec 21, 7:57 AM CST | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Cleveland, Columbia, Drew and 3 more | 63 min |
| Dec 21, 10:45 AM CST | Mesoscale Discussion | SPC | Arkansas, Bradley, Calhoun, Cleveland, Crittenden, Desha and 8 more | 60 min |
| Dec 21, 12:01 PM CST | Tornado Watch | SPC | Arkansas, Bradley, Calhoun, Cleveland, Crittenden, Dallas and 10 more | 8 hr |
| Dec 21, 12:30 PM CST | Mesoscale Discussion | SPC | Ashley, Chicot, Columbia, Lafayette, Union | 60 min |
| Dec 21, 2:50 PM CST | Mesoscale Discussion | SPC | Arkansas, Bradley, Crittenden, Cross, Desha, Drew and 6 more | 55 min |
| Dec 21, 5:06 PM CST | Mesoscale Discussion | SPC | Ascension, Concordia, East Baton Rouge, East Carroll, East Feliciana, Iberville and 9 more | 84 min |
| Dec 21, 5:22 PM CST | Tornado Watch | SPC | Acadia, Allen, Ascension, Avoyelles, Catahoula, Concordia and 21 more | 7 hr |
| Dec 21, 5:46 PM CST | Tornado Watch | SPC | Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more | 6 hr |
| Dec 21, 6:20 AM CST | Mesoscale Discussion | SPC | Bell, Blanco, Bosque, Brown, Burnet, Coleman and 31 more | 115 min |
| Dec 21, 9:53 AM CST | Mesoscale Discussion | SPC | Atascosa, Bastrop, Bee, Bexar, Caldwell, DeWitt and 11 more | 67 min |
| Dec 21, 10:29 AM CST | Severe Thunderstorm Watch | SPC | Aransas, Atascosa, Bastrop, Bee, Caldwell, Calhoun and 14 more | 3 hr |
Nearby
Tornado Watches in Louisiana, 2013Tornado Watches in Texas, 2013Tornado Watches in Arkansas, 2013Every tornado watch in 2013
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.