Alert archive / Texas / Tornado Watches in 2006

Tornado Watch 827

October 15, 20069 parishes in Louisiana; 16 counties in Texas

The Storm Prediction Center issued this tornado watch at Oct 15, 2006, 11:34 PM CDT for 9 parishes in Louisiana; 16 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Oct 15, 2006, 11:34 PM CDT (04:34 UTC)
Expired
Oct 16, 2006, 6:06 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
0.5 in
Strongest gust expected
60 kt
All 25 counties

Acadia Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Iberia Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Vermilion Parish, LA, Austin County, TX, Brazoria County, TX, Chambers County, TX, Colorado County, TX, Fort Bend County, TX, Galveston County, TX, Hardin County, TX, Harris County, TX, Jackson County, TX, Jefferson County, TX, Liberty County, TX, Matagorda County, TX, Montgomery County, TX, Orange County, TX, Waller County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 40 km from the middle of the area, began a volume at 04:37 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

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
10%
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
40%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Oct 15, 11:42 PM CDTTornado WarningHGXBrazoria48 min
Oct 16, 12:30 AM CDTTornado WarningHGXBrazoria45 min
Oct 16, 12:55 AM CDTFlash Flood WarningHGXBrazoria110 min
Oct 16, 12:59 AM CDTTornado WarningHGXGalveston31 min
Oct 16, 1:29 AM CDTTornado WarningHGXGalveston19 min
Oct 16, 2:11 AM CDTTornado WarningHGXChambers49 min
Oct 16, 2:28 AM CDTTornado WarningLCHJefferson32 min
Oct 16, 2:38 AM CDTTornado WarningHGXGalveston52 min
Oct 16, 2:46 AM CDTTornado WarningLCHCameron29 min
Oct 16, 2:54 AM CDTTornado WarningHGXChambers29 min
Oct 16, 3:00 AM CDTTornado WarningLCHVermilion30 min
Oct 16, 3:26 AM CDTTornado WarningHGXGalveston26 min
Oct 16, 3:36 AM CDTTornado WarningLCHCameron24 min
Oct 16, 3:58 AM CDTTornado WarningLCHCameron32 min
Oct 16, 4:05 AM CDTTornado WarningHGXChambers40 min
Oct 16, 4:32 AM CDTTornado WarningLCHCameron28 min
Oct 16, 4:35 AM CDTTornado WarningHGXChambers, Galveston40 min
Oct 16, 4:51 AM CDTTornado WarningLCHJefferson Davis24 min
Oct 16, 5:02 AM CDTFlash Flood WarningHGXBrazoria, Chambers, Fort Bend, Galveston, Harris, Liberty and 2 more3 hr
Oct 16, 5:13 AM CDTTornado WarningHGXChambers, Galveston32 min
Oct 16, 5:15 AM CDTTornado WarningLCHJefferson30 min
Oct 16, 5:20 AM CDTFlash Flood WarningLCHHardin3 hr
Oct 16, 5:23 AM CDTTornado WarningHGXGalveston22 min
Oct 16, 5:33 AM CDTTornado WarningLCHOrange27 min
Oct 16, 5:41 AM CDTTornado WarningLCHJefferson34 min
Oct 16, 5:45 AM CDTTornado WarningHGXChambers, Liberty30 min
Oct 16, 6:02 AM CDTTornado WarningHGXHarris, Liberty43 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, 4.6 hours before the alert went out and 157 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 00:00Z on 2006-10-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 100 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2006-10-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 278 square meters per square second.193958Sfc1 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
100 J/kg
Mixed-layer CIN
-71 J/kg
Mixed-layer LCL
518 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
278 m²/s²
0-3 km storm-relative helicity
439 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 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
Oct 16, 6:44 PM CDTTornado WatchSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 9 more7 hr
Oct 16, 3:50 AM CDTMesoscale DiscussionSPCBandera, Dimmit, Frio, Kinney, Maverick, Medina and 3 more85 min

Nearby

Tornado Watches in Texas, 2006Tornado 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; radar from the NEXRAD Level II archive.