Alert archive / Louisiana / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 60
The Storm Prediction Center issued this severe thunderstorm watch at Mar 2, 2012, 1:47 PM CST for 4 states. It was in force for 9 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 2, 2012, 1:47 PM CST (19:47 UTC)
- Expired
- Mar 2, 2012, 11:00 PM CST
- In force
- 9 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 48 counties
Ashley County, AR, Chicot County, AR, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Caldwell Parish, LA, Catahoula 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, 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, Tensas Parish, LA, Union Parish, LA, Vernon Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Bolivar County, MS, Claiborne County, MS, Franklin County, MS, Issaquena County, MS, Jefferson County, MS, Leflore County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Angelina County, TX, Jasper County, TX, Nacogdoches County, TX, Newton 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
30 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 2, 2:03 PM CST | Severe Thunderstorm Warning | SHV | Union | 42 min |
| Mar 2, 2:09 PM CST | Severe Thunderstorm Warning | JAN | Ashley, Chicot | 66 min |
| Mar 2, 2:18 PM CST | Severe Thunderstorm Warning | JAN | Ashley | 72 min |
| Mar 2, 2:18 PM CST | Severe Thunderstorm Warning | SHV | Bienville, Claiborne, Lincoln | 42 min |
| Mar 2, 2:29 PM CST | Severe Thunderstorm Warning | JAN | Bolivar, Washington | 61 min |
| Mar 2, 2:54 PM CST | Severe Thunderstorm Warning | SHV | Lincoln, Ouachita, Union | 51 min |
| Mar 2, 3:17 PM CST | Severe Thunderstorm Warning | JAN | Chicot | 43 min |
| Mar 2, 3:25 PM CST | Severe Thunderstorm Warning | JAN | Carroll, Grenada, Leflore, Montgomery | 65 min |
| Mar 2, 3:30 PM CST | Severe Thunderstorm Warning | SHV | Sabine, San Augustine, Shelby | 45 min |
| Mar 2, 3:33 PM CST | Severe Thunderstorm Warning | JAN | Morehouse | 42 min |
| Mar 2, 3:36 PM CST | Severe Thunderstorm Warning | JAN | Leflore, Sunflower, Washington | 42 min |
| Mar 2, 3:48 PM CST | Severe Thunderstorm Warning | SHV | De Soto, Natchitoches, Red River | 42 min |
| Mar 2, 4:06 PM CST | Severe Thunderstorm Warning | SHV | Natchitoches, Sabine | 39 min |
| Mar 2, 4:07 PM CST | Severe Thunderstorm Warning | JAN | Chicot | 53 min |
| Mar 2, 4:22 PM CST | Severe Thunderstorm Warning | SHV | Jackson, Natchitoches, Winn | 38 min |
| Mar 2, 4:32 PM CST | Severe Thunderstorm Warning | JAN | Carroll, Holmes, Humphreys, Leflore, Sunflower | 58 min |
| Mar 2, 4:43 PM CST | Severe Thunderstorm Warning | SHV | Natchitoches, Winn | 62 min |
| Mar 2, 4:58 PM CST | Severe Thunderstorm Warning | SHV | Caldwell, Jackson, Ouachita, Winn | 47 min |
| Mar 2, 5:10 PM CST | Severe Thunderstorm Warning | JAN | Humphreys, Sharkey, Washington | 35 min |
| Mar 2, 5:26 PM CST | Severe Thunderstorm Warning | JAN | East Carroll, Madison, Richland, West Carroll | 49 min |
| Mar 2, 5:32 PM CST | Severe Thunderstorm Warning | JAN | Franklin, Madison, Richland | 43 min |
| Mar 2, 5:37 PM CST | Severe Thunderstorm Warning | SHV | Caldwell, Grant, LaSalle, Winn | 53 min |
| Mar 2, 6:03 PM CST | Severe Thunderstorm Warning | JAN | East Carroll | 57 min |
| Mar 2, 6:16 PM CST | Severe Thunderstorm Warning | JAN | Franklin, Madison | 74 min |
| Mar 2, 6:24 PM CST | Severe Thunderstorm Warning | JAN | Catahoula, Franklin | 66 min |
| Mar 2, 6:25 PM CST | Severe Thunderstorm Warning | SHV | Caldwell, LaSalle | 39 min |
| Mar 2, 6:28 PM CST | Tornado Warning | JAN | Madison, Tensas | 33 min |
| Mar 2, 7:18 PM CST | Tornado Warning | JAN | Hinds, Madison, Warren, Yazoo | 22 min |
| Mar 2, 8:39 PM CST | Severe Thunderstorm Warning | JAN | Catahoula, Concordia | 51 min |
| Mar 2, 9:17 PM CST | Severe Thunderstorm Warning | JAN | Claiborne, Copiah, Hinds | 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
Shreveport, LA (KSHV), launched 12:00Z, 7.8 hours before the alert went out and 133 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
- 1427 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 626 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 347 m²/s²
- 0-3 km storm-relative helicity
- 292 m²/s²
- Significant tornado parameter
- 2.5
- Supercell composite
- 9.6
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 2, 10:28 AM CST | Mesoscale Discussion | SPC | Clay, Craighead, Crittenden, Cross, Greene, Independence and 10 more | 62 min |
| Mar 2, 1:26 PM CST | Mesoscale Discussion | SPC | Ashley, Chicot | 64 min |
| Mar 2, 3:47 PM CST | Mesoscale Discussion | SPC | Ashley, Chicot | 58 min |
| Mar 2, 2:42 PM CST | Mesoscale Discussion | SPC | Ascension, East Baton Rouge, East Feliciana, Livingston, Saint Helena, Saint Tammany and 2 more | 63 min |
| Mar 2, 12:57 PM CST | Mesoscale Discussion | SPC | Alcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 32 more | 63 min |
| Mar 2, 1:20 PM CST | Tornado Watch | SPC | Alcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 24 more | 9 hr |
| Mar 2, 3:25 PM CST | Mesoscale Discussion | SPC | Alcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 24 more | 65 min |
| Mar 2, 4:37 PM CST | Tornado Watch | SPC | George, Greene, Perry, Stone, Wayne | 7 hr |
| Mar 2, 4:47 PM CST | Tornado Watch | SPC | Attala, Choctaw, Clarke, Clay, Copiah, Covington and 23 more | 6 hr |
Nearby
Severe Thunderstorm Watches in Louisiana, 2012Severe Thunderstorm Watches in Mississippi, 2012Severe Thunderstorm Watches in Texas, 2012Every severe thunderstorm watch in 2012
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.