Alert archive / Louisiana / Tornado Watches in 2006
Tornado Watch 889
The Storm Prediction Center issued this tornado watch at Dec 29, 2006, 8:19 PM CST for 29 parishes in Louisiana. It was in force for 10 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 29, 2006, 8:19 PM CST (02:19 UTC)
- Expired
- Dec 30, 2006, 6:00 AM CST
- In force
- 10 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 29 counties
Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Cameron Parish, LA, De Soto Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Iberia Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Webster Parish, LA, Winn Parish, LA
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
- 30%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 30, 12:03 AM CST | Flash Flood Warning | SHV | Sabine | 4 hr |
| Dec 30, 1:44 AM CST | Tornado Warning | SHV | Natchitoches, Red River | 28 min |
| Dec 30, 5:15 AM CST | Tornado Warning | LCH | Allen | 15 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
Lake Charles Mun, LA (KLCH), launched 00:00Z, 2.3 hours before the alert went out and 140 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
- 1234 J/kg
- Mixed-layer CIN
- -29 J/kg
- Mixed-layer LCL
- 528 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 312 m²/s²
- 0-3 km storm-relative helicity
- 410 m²/s²
- Significant tornado parameter
- 2.5
- Supercell composite
- 17.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 29, 7:52 PM CST | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 18 more | 53 min |
| Dec 29, 11:41 PM CST | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Beauregard, Bienville, Bossier and 24 more | 94 min |
| Dec 30, 3:14 AM CST | Mesoscale Discussion | SPC | Acadia, Allen, Assumption, Avoyelles, Beauregard, Bienville and 30 more | 91 min |
| Dec 30, 5:43 AM CST | Tornado Watch | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Cameron and 19 more | 6 hr |
| Dec 30, 7:49 AM CST | Mesoscale Discussion | SPC | Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles, Saint John the Baptist and 3 more | 86 min |
| Dec 30, 8:43 AM CST | Tornado Watch | SPC | Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 5 more | 5 hr |
| Dec 30, 10:22 AM CST | Mesoscale Discussion | SPC | Ascension, Assumption, Jefferson, Lafourche, Livingston, Orleans and 9 more | 83 min |
| Dec 30, 1:13 PM CST | Mesoscale Discussion | SPC | Jefferson, Lafourche, Orleans, Saint Bernard, Saint Charles, Saint Tammany | 62 min |
| Dec 30, 1:30 PM CST | Tornado Watch | SPC | Jefferson, Lafourche, Livingston, Orleans, Plaquemines, Saint Bernard and 6 more | 7 hr |
| Dec 30, 5:45 PM CST | Mesoscale Discussion | SPC | Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 4 more | 60 min |
| Dec 29, 7:02 PM CST | Mesoscale Discussion | SPC | Clay, Collin, Cooke, Dallas, Delta, Denton and 8 more | 58 min |
| Dec 29, 7:27 PM CST | Mesoscale Discussion | SPC | Hansford | 5 hr |
| Dec 30, 12:26 AM CST | Mesoscale Discussion | SPC | Carson, Dallam, Deaf Smith, Hansford, Hartley, Hutchinson and 6 more | 5 hr |
| Dec 30, 1:23 AM CST | Mesoscale Discussion | SPC | Jasper, Jefferson, Newton, Orange | 67 min |
| Dec 30, 6:46 AM CST | Mesoscale Discussion | SPC | Dallam, Deaf Smith, Hansford, Hartley, Moore, Oldham and 3 more | 5 hr |
Nearby
Tornado Watches in Louisiana, 2006Every tornado watch in 2006
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.