Alert archive / Louisiana / Tornado Watches in 2006

Tornado Watch 833

October 16, 200615 parishes in Louisiana

The Storm Prediction Center issued this tornado watch at Oct 16, 2006, 6:44 PM CDT for 15 parishes in Louisiana. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Oct 16, 2006, 6:44 PM CDT (23:44 UTC)
Expired
Oct 17, 2006, 2:00 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
0.5 in
Strongest gust expected
60 kt

Counties Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Evangeline Parish, LA, Iberia Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Rapides Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Vermilion 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
40%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
5%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Oct 16, 7:20 PM CDTSevere Thunderstorm WarningLCHRapides55 min
Oct 16, 7:46 PM CDTSevere Thunderstorm WarningLCHRapides59 min
Oct 16, 7:53 PM CDTSevere Thunderstorm WarningLCHAllen67 min
Oct 16, 7:58 PM CDTFlash Flood WarningLCHAllen, Avoyelles, Evangeline, Rapides3 hr
Oct 16, 9:14 PM CDTSevere Thunderstorm WarningLCHAvoyelles61 min
Oct 16, 9:22 PM CDTFlash Flood WarningLCHAcadia, Evangeline, Jefferson Davis, Saint Landry3 hr
Oct 16, 11:08 PM CDTTornado WarningLCHVermilion22 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 12:00Z, 11.7 hours before the alert went out and 116 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.

Skew-T log-pSkew-T log-p diagram, Lake Charles Mun, LA at 12:00Z on 2006-10-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2542 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 12:00Z on 2006-10-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 560 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
2542 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
475 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
560 m²/s²
0-3 km storm-relative helicity
719 m²/s²
Significant tornado parameter
11.5
Supercell composite
47.4

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 15, 10:57 PM CDTMesoscale DiscussionSPCCalcasieu, Cameron63 min
Oct 15, 11:34 PM CDTTornado WatchSPCAcadia, Calcasieu, Cameron, Iberia, Jefferson Davis, Lafayette and 3 more7 hr
Oct 16, 1:26 AM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, Iberville, Jefferson, Lafourche and 11 more94 min
Oct 16, 2:13 AM CDTTornado WatchSPCAscension, Assumption, Iberville, Jefferson, Lafourche, Orleans and 6 more4 hr
Oct 16, 3:25 AM CDTMesoscale DiscussionSPCAcadia, Allen, Assumption, Beauregard, Calcasieu, Cameron and 12 more95 min
Oct 16, 5:32 AM CDTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Beauregard, Calcasieu and 22 more88 min
Oct 16, 5:58 AM CDTTornado WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 32 more5 hr
Oct 16, 7:51 AM CDTMesoscale DiscussionSPCDe Soto, Grant, LaSalle, Natchitoches, Red River, Sabine and 1 more84 min
Oct 16, 10:37 AM CDTTornado WatchSPCAcadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 27 more9 hr
Oct 16, 12:39 PM CDTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 30 more96 min
Oct 16, 1:56 PM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Livingston and 13 more64 min
Oct 16, 2:24 PM CDTTornado WatchSPCAscension, East Baton Rouge, East Feliciana, Iberville, Livingston, Pointe Coupee and 6 more3 hr
Oct 16, 3:37 PM CDTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 33 more83 min
Oct 16, 5:07 PM CDTMesoscale DiscussionSPCSaint Bernard23 min
Oct 16, 5:39 PM CDTTornado WatchSPCAscension, Catahoula, Concordia, East Baton Rouge, East Carroll, East Feliciana and 12 more8 hr
Oct 16, 6:19 PM CDTMesoscale DiscussionSPCAcadia, Allen, Assumption, Avoyelles, Calcasieu, Cameron and 11 more26 min

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.