Alert archive / Louisiana / Severe Thunderstorm Watches in 2013
Severe Thunderstorm Watch 71
The Storm Prediction Center issued this severe thunderstorm watch at Mar 31, 2013, 9:20 AM CDT for Columbia County, Union County, Arkansas; 17 parishes in Louisiana; Angelina County, Sabine County, San Augustine County, Texas. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 31, 2013, 9:20 AM CDT (14:20 UTC)
- Expired
- Mar 31, 2013, 2:03 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 22 counties
Columbia County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Angelina County, TX, Sabine County, TX, San Augustine County, TX
The radar
The Shreveport radar (KSHV), 18 km from the middle of the area, began a volume at 14:23 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
- 5%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 90%
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 31, 10:00 AM CDT | Severe Thunderstorm Warning | SHV | Columbia, Lafayette, Miller, Union | 60 min |
| Mar 31, 10:31 AM CDT | Severe Thunderstorm Warning | SHV | Caddo, De Soto | 59 min |
| Mar 31, 10:57 AM CDT | Severe Thunderstorm Warning | SHV | Union | 63 min |
| Mar 31, 11:29 AM CDT | Severe Thunderstorm Warning | SHV | De Soto, Sabine | 61 min |
| Mar 31, 11:58 AM CDT | Severe Thunderstorm Warning | SHV | Caldwell, Grant, Jackson, LaSalle, Natchitoches, Ouachita and 2 more | 62 min |
| Mar 31, 12:58 PM CDT | Severe Thunderstorm Warning | SHV | Caldwell, Grant, LaSalle | 32 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 12:00Z, 2.3 hours before the alert went out and 9 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
- 252 J/kg
- Mixed-layer CIN
- -155 J/kg
- Mixed-layer LCL
- 700 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 93 m²/s²
- 0-3 km storm-relative helicity
- 122 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.7
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 30, 9:06 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more | 5 hr |
| Mar 30, 10:44 PM CDT | Mesoscale Discussion | SPC | Crawford, Franklin, Johnson, Logan, Madison, Newton and 6 more | 91 min |
| Mar 31, 5:10 AM CDT | Severe Thunderstorm Watch | SPC | Hempstead, Howard, Lafayette, Little River, Miller, Sevier | 7 hr |
| Mar 31, 7:36 AM CDT | Mesoscale Discussion | SPC | Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 2 more | 114 min |
| Mar 31, 10:33 AM CDT | Mesoscale Discussion | SPC | Calhoun, Columbia, Union | 57 min |
| Mar 31, 11:54 AM CDT | Mesoscale Discussion | SPC | Allen, Avoyelles, Beauregard, Caldwell, Catahoula, Concordia and 20 more | 36 min |
| Mar 31, 12:17 PM CDT | Severe Thunderstorm Watch | SPC | Acadia, Allen, Ascension, Avoyelles, Beauregard, Calcasieu and 32 more | 6 hr |
| Mar 31, 2:32 PM CDT | Mesoscale Discussion | SPC | Allen, Avoyelles, Beauregard, Calcasieu, Caldwell, Catahoula and 21 more | 58 min |
| Mar 31, 2:48 PM CDT | Severe Thunderstorm Watch | SPC | Cameron, Iberia, Saint Martin, St. Mary, Vermilion | 5 hr |
| Mar 31, 3:21 PM CDT | Mesoscale Discussion | SPC | Jefferson, Orleans, Saint Charles, Saint James, Saint John the Baptist, Saint Tammany and 1 more | 54 min |
| Mar 31, 3:38 PM CDT | Severe Thunderstorm Watch | SPC | Assumption, Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard and 5 more | 3 hr |
| Mar 30, 8:14 PM CDT | Mesoscale Discussion | SPC | Clay, Montague, Wichita, Wilbarger | 91 min |
| Mar 31, 1:13 AM CDT | Mesoscale Discussion | SPC | Wheeler | 62 min |
| Mar 31, 4:54 AM CDT | Mesoscale Discussion | SPC | Clay, Collin, Cooke, Delta, Denton, Fannin and 8 more | 96 min |
| Mar 31, 1:00 PM CDT | Mesoscale Discussion | SPC | Austin, Bandera, Bastrop, Bexar, Blanco, Brazos and 32 more | 60 min |
| Mar 31, 1:17 PM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Austin, Bandera, Bastrop, Bell, Bexar and 47 more | 9 hr |
| Mar 31, 5:24 PM CDT | Mesoscale Discussion | SPC | Atascosa, Brazoria, Chambers, DeWitt, Dimmit, Fort Bend and 18 more | 96 min |
| Mar 31, 6:20 PM CDT | Severe Thunderstorm Watch | SPC | Bee, Duval, Jim Wells, Kleberg, La Salle, Live Oak and 4 more | 4 hr |
Nearby
Severe Thunderstorm Watches in Louisiana, 2013Severe Thunderstorm Watches in Texas, 2013Severe Thunderstorm Watches in Arkansas, 2013Every severe thunderstorm 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.