Alert archive / Louisiana / Tornado Watches in 2010
Tornado Watch 26
The Storm Prediction Center issued this tornado watch at Mar 10, 2010, 7:46 PM CST for 22 parishes in Louisiana; 8 counties in Mississippi. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 10, 2010, 7:46 PM CST (01:46 UTC)
- Expired
- Mar 11, 2010, 12:00 AM CST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 30 counties
Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Pointe Coupee Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Amite County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Pearl River County, MS, Pike County, MS, Walthall County, MS, Wilkinson County, MS
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
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 10, 8:05 PM CST | Severe Thunderstorm Warning | LIX | Ascension, Assumption, East Baton Rouge, Iberville, Saint James, West Baton Rouge | 40 min |
| Mar 10, 8:30 PM CST | Severe Thunderstorm Warning | LIX | Plaquemines | 60 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 00:00Z, 1.8 hours before the alert went out and 257 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
- 1268 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 1282 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 74 m²/s²
- 0-3 km storm-relative helicity
- 183 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 4.9
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 10, 7:24 PM CST | Tornado Watch | SPC | East Carroll, Franklin, Madison, Morehouse, Richland, Tensas and 1 more | 8 hr |
| Mar 10, 7:36 PM CST | Mesoscale Discussion | SPC | Ascension, Assumption, Jefferson, Lafourche, Orleans, Plaquemines and 7 more | 54 min |
| Mar 10, 8:58 PM CST | Mesoscale Discussion | SPC | Bienville, Bossier, Claiborne, De Soto, Jackson, Lincoln and 3 more | 62 min |
| Mar 10, 10:23 PM CST | Mesoscale Discussion | SPC | East Carroll, Franklin, Madison, West Carroll | 67 min |
| Mar 11, 4:54 PM CST | Mesoscale Discussion | SPC | Allen, Avoyelles, Beauregard, Caldwell, Catahoula, Concordia and 14 more | 66 min |
| Mar 10, 6:54 PM CST | Mesoscale Discussion | SPC | Coahoma, DeSoto, Marshall, Panola, Quitman, Tate and 1 more | 96 min |
| Mar 10, 7:48 PM CST | Tornado Watch | SPC | Coahoma, DeSoto, Lafayette, Marshall, Panola, Quitman and 4 more | 6 hr |
| Mar 10, 11:08 PM CST | Mesoscale Discussion | SPC | Coahoma, DeSoto, Tate, Tunica | 97 min |
| Mar 11, 1:21 AM CST | Mesoscale Discussion | SPC | Alcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 44 more | 54 min |
| Mar 11, 1:42 AM CST | Tornado Watch | SPC | Alcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 40 more | 4 hr |
| Mar 11, 4:36 AM CST | Mesoscale Discussion | SPC | Clarke, Covington, Jasper, Jones, Kemper, Lauderdale and 5 more | 114 min |
Nearby
Tornado Watches in Louisiana, 2010Tornado Watches in Mississippi, 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.