Alert archive / Louisiana / Tornado Watches in 2010
Tornado Watch 79
The Storm Prediction Center issued this tornado watch at Apr 23, 2010, 9:53 AM CDT for 21 counties in Arkansas; 26 parishes in Louisiana; 16 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 23, 2010, 9:53 AM CDT (14:53 UTC)
- Expired
- Apr 23, 2010, 5:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 63 counties
Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Lincoln County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Sevier 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, Camp County, TX, Cass County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Panola County, TX, Red River County, TX, Rusk County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Wood County, TX
The radar
The Shreveport radar (KSHV), 79 km from the middle of the area, began a volume at 14:57 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
- 60%
- One or more EF2 to EF5 tornadoes
- 30%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 23, 11:15 AM CDT | Severe Thunderstorm Warning | SHV | Jackson, Lincoln, Ouachita | 17 min |
| Apr 23, 12:08 PM CDT | Severe Thunderstorm Warning | JAN | Madison, Tensas | 52 min |
| Apr 23, 12:27 PM CDT | Severe Thunderstorm Warning | SHV | Ouachita | 29 min |
| Apr 23, 12:29 PM CDT | Severe Thunderstorm Warning | SHV | Claiborne, Webster | 46 min |
| Apr 23, 12:31 PM CDT | Severe Thunderstorm Warning | JAN | Madison, Tensas | 44 min |
| Apr 23, 12:52 PM CDT | Severe Thunderstorm Warning | SHV | Columbia, Union | 53 min |
| Apr 23, 1:13 PM CDT | Severe Thunderstorm Warning | LZK | Montgomery, Pike, Polk | 34 min |
| Apr 23, 1:21 PM CDT | Severe Thunderstorm Warning | LZK | Clark, Garland, Hot Spring, Montgomery, Pike | 24 min |
| Apr 23, 1:37 PM CDT | Severe Thunderstorm Warning | LZK | Bradley, Calhoun, Ouachita | 38 min |
| Apr 23, 2:09 PM CDT | Severe Thunderstorm Warning | LZK | Clark, Garland, Hot Spring, Saline | 51 min |
| Apr 23, 3:48 PM CDT | Severe Thunderstorm Warning | LZK | Calhoun, Cleveland, Dallas, Grant, Jefferson, Ouachita | 42 min |
| Apr 23, 4:29 PM CDT | Severe Thunderstorm Warning | LZK | Cleveland, Dallas, Grant, Jefferson, Lincoln | 46 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
Jackson, MS (KJAN), launched 12:00Z, 2.9 hours before the alert went out and 329 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
- 37 J/kg
- Mixed-layer CIN
- -425 J/kg
- Mixed-layer LCL
- 519 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 165 m²/s²
- 0-3 km storm-relative helicity
- 154 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 |
|---|---|---|---|---|
| Apr 23, 8:28 AM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Clark, Columbia, Hempstead and 9 more | 62 min |
| Apr 23, 12:08 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 14 more | 67 min |
| Apr 23, 12:51 PM CDT | Tornado Watch | SPC | Arkansas, Clay, Cleburne, Conway, Craighead, Crittenden and 28 more | 9 hr |
| Apr 23, 2:50 PM CDT | Mesoscale Discussion | SPC | Clark, Columbia, Garland, Hempstead, Hot Spring, Howard and 9 more | 115 min |
| Apr 23, 3:47 PM CDT | Mesoscale Discussion | SPC | Arkansas, Baxter, Clay, Cleburne, Conway, Craighead and 29 more | 58 min |
| Apr 23, 5:24 PM CDT | Mesoscale Discussion | SPC | Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 2 more | 36 min |
| Apr 23, 5:41 PM CDT | Tornado Watch | SPC | Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 2 more | 9 hr |
| Apr 23, 6:31 PM CDT | Mesoscale Discussion | SPC | Arkansas, Clay, Cleburne, Cleveland, Conway, Craighead and 26 more | 29 min |
| Apr 23, 6:51 PM CDT | Tornado Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 40 more | 8 hr |
| Apr 22, 7:45 PM CDT | Mesoscale Discussion | SPC | Briscoe, Childress, Collingsworth, Cottle, Crosby, Dickens and 20 more | 60 min |
| Apr 22, 8:31 PM CDT | Tornado Watch | SPC | Andrews, Archer, Baylor, Borden, Briscoe, Childress and 35 more | 7 hr |
| Apr 22, 9:17 PM CDT | Mesoscale Discussion | SPC | Coke, Concho, Crane, Crockett, Ector, Edwards and 16 more | 28 min |
| Apr 22, 9:32 PM CDT | Tornado Watch | SPC | Callahan, Coke, Coleman, Concho, Crane, Crockett and 20 more | 6 hr |
| Apr 23, 12:00 AM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Borden, Briscoe, Callahan, Childress and 53 more | 60 min |
| Apr 23, 2:01 AM CDT | Mesoscale Discussion | SPC | Archer, Callahan, Clay, Coleman, Concho, Eastland and 8 more | 119 min |
Nearby
Tornado Watches in Louisiana, 2010Tornado Watches in Arkansas, 2010Tornado Watches in Texas, 2010Every tornado watch in 2010
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.