Alert archive / Louisiana / Tornado Watches in 2015
Tornado Watch 105
The Storm Prediction Center issued this tornado watch at Apr 24, 2015, 9:59 PM CDT for 4 states. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 24, 2015, 9:59 PM CDT (02:59 UTC)
- Expired
- Apr 25, 2015, 2:19 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 70 kt
All 48 counties
Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Cleveland County, AR, Columbia County, AR, Desha County, AR, Drew County, AR, Lafayette County, AR, Lincoln County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Tensas Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Bolivar County, MS, Humphreys County, MS, Issaquena County, MS, Sharkey County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Yazoo County, MS, Cherokee County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Shelby County, TX, Smith County, TX
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 30%
- 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
- 80%
Warnings issued inside it
21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 24, 10:05 PM CDT | Severe Thunderstorm Warning | LZK | Arkansas, Bradley, Cleveland, Desha, Drew, Jefferson and 1 more | 55 min |
| Apr 24, 10:08 PM CDT | Severe Thunderstorm Warning | SHV | Cherokee, Rusk, Smith | 67 min |
| Apr 24, 10:17 PM CDT | Severe Thunderstorm Warning | SHV | Columbia, Hempstead, Lafayette, Nevada, Union | 43 min |
| Apr 24, 10:19 PM CDT | Flash Flood Warning | LZK | Calhoun, Cleveland, Dallas, Grant, Ouachita | 2 hr |
| Apr 24, 10:32 PM CDT | Severe Thunderstorm Warning | SHV | Bienville, Bossier, Caddo, Claiborne, De Soto, Red River and 1 more | 43 min |
| Apr 24, 10:34 PM CDT | Severe Thunderstorm Warning | SHV | Cherokee, Nacogdoches, Panola, Rusk, Smith | 41 min |
| Apr 24, 10:45 PM CDT | Tornado Warning | SHV | Union | 30 min |
| Apr 24, 10:52 PM CDT | Severe Thunderstorm Warning | SHV | Union | 53 min |
| Apr 24, 11:02 PM CDT | Severe Thunderstorm Warning | SHV | Caddo, De Soto | 58 min |
| Apr 24, 11:23 PM CDT | Severe Thunderstorm Warning | JAN | Ashley | 67 min |
| Apr 24, 11:32 PM CDT | Tornado Warning | JAN | Ashley | 47 min |
| Apr 24, 11:44 PM CDT | Flash Flood Warning | JAN | Chicot | 2 hr |
| Apr 24, 11:46 PM CDT | Tornado Warning | JAN | Morehouse | 34 min |
| Apr 24, 11:47 PM CDT | Severe Thunderstorm Warning | SHV | Ouachita, Union | 28 min |
| Apr 24, 11:57 PM CDT | Severe Thunderstorm Warning | JAN | Chicot | 43 min |
| Apr 25, 12:07 AM CDT | Flash Flood Warning | LZK | Desha, Drew, Lincoln | 3 hr |
| Apr 25, 12:09 AM CDT | Tornado Warning | JAN | Chicot | 66 min |
| Apr 25, 12:18 AM CDT | Severe Thunderstorm Warning | JAN | East Carroll, Madison | 57 min |
| Apr 25, 12:39 AM CDT | Tornado Warning | JAN | Humphreys, Issaquena, Sharkey, Yazoo | 51 min |
| Apr 25, 1:05 AM CDT | Severe Thunderstorm Warning | JAN | Madison | 55 min |
| Apr 25, 1:22 AM CDT | Tornado Warning | JAN | Madison, Yazoo | 38 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 (KBAD), launched 00:00Z, 3.0 hours before the alert went out and 93 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
- 310 J/kg
- Mixed-layer CIN
- -118 J/kg
- Mixed-layer LCL
- 809 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 317 m²/s²
- 0-3 km storm-relative helicity
- 428 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 9.9
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 24, 7:46 PM CDT | Mesoscale Discussion | SPC | Columbia, Lafayette, Miller, Union | 89 min |
| Apr 24, 9:20 PM CDT | Mesoscale Discussion | SPC | Ashley, Chicot, Columbia, Lafayette, Union | 55 min |
| Apr 24, 11:45 PM CDT | Mesoscale Discussion | SPC | Caldwell, East Carroll, Franklin, Jackson, Madison, Morehouse and 5 more | 90 min |
| Apr 25, 2:07 AM CDT | Mesoscale Discussion | SPC | Madison | 83 min |
| Apr 25, 7:12 AM CDT | Severe Thunderstorm Watch | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 10 more | 6 hr |
| Apr 25, 9:35 AM CDT | Mesoscale Discussion | SPC | Acadia, Ascension, Assumption, Avoyelles, Cameron, East Baton Rouge and 27 more | 115 min |
| Apr 25, 10:41 AM CDT | Severe Thunderstorm Watch | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 16 more | 7 hr |
| Apr 25, 1:50 PM CDT | Mesoscale Discussion | SPC | Orleans, Saint Bernard, Saint Charles, Saint John the Baptist, Saint Tammany, Washington | 85 min |
| Apr 25, 12:50 AM CDT | Tornado Watch | SPC | Attala, Calhoun, Carroll, Chickasaw, Choctaw, Claiborne and 25 more | 6 hr |
| Apr 25, 4:12 AM CDT | Mesoscale Discussion | SPC | Clarke, George, Greene, Wayne | 63 min |
| Apr 24, 10:55 PM CDT | Mesoscale Discussion | SPC | Cameron | 65 min |
| Apr 25, 2:48 AM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Bexar, Caldwell, Comal, DeWitt and 17 more | 87 min |
| Apr 25, 3:09 AM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Austin, Bandera, Bastrop, Bexar, Blanco and 31 more | 7 hr |
| Apr 25, 4:31 AM CDT | Mesoscale Discussion | SPC | Atascosa, Austin, Bandera, Bastrop, Bexar, Caldwell and 23 more | 89 min |
| Apr 25, 6:52 AM CDT | Mesoscale Discussion | SPC | Atascosa, Brazoria, Chambers, DeWitt, Fort Bend, Frio and 11 more | 83 min |
Nearby
Tornado Watches in Louisiana, 2015Tornado Watches in Arkansas, 2015Tornado Watches in Texas, 2015Every tornado watch in 2015
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.