Alert archive / Mississippi / Tornado Watches in 2006

Tornado Watch 835

October 17, 200612 counties in Alabama; 20 parishes in Louisiana; 31 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Oct 17, 2006, 1:38 AM CDT for 12 counties in Alabama; 20 parishes in Louisiana; 31 counties in Mississippi. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Oct 17, 2006, 1:38 AM CDT (06:38 UTC)
Expired
Oct 17, 2006, 9:00 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
0.5 in
Strongest gust expected
60 kt
All 63 counties

Baldwin County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Dallas County, AL, Escambia County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Sumter County, AL, Washington County, AL, Wilcox County, AL, 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, 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, Amite County, MS, Clarke County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS, Winston County, MS

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
60%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
20%
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

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

IssuedProductOfficeCountiesLasted
Oct 17, 1:40 AM CDTSevere Thunderstorm WarningJANSmith35 min
Oct 17, 2:10 AM CDTTornado WarningLIXWalthall50 min
Oct 17, 2:45 AM CDTSevere Thunderstorm WarningJANMarion45 min
Oct 17, 3:02 AM CDTTornado WarningJANLamar, Marion43 min
Oct 17, 3:13 AM CDTTornado WarningLIXLafourche47 min
Oct 17, 3:28 AM CDTTornado WarningLIXJefferson, Plaquemines47 min
Oct 17, 3:35 AM CDTTornado WarningJANForrest25 min
Oct 17, 4:02 AM CDTTornado WarningLIXSaint Bernard28 min
Oct 17, 4:02 AM CDTSevere Thunderstorm WarningMOBPerry28 min
Oct 17, 4:38 AM CDTSevere Thunderstorm WarningMOBWayne52 min
Oct 17, 5:04 AM CDTTornado WarningLIXPlaquemines26 min
Oct 17, 5:28 AM CDTSevere Thunderstorm WarningLIXHarrison62 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

Slidell Radar S, LA (KSIL), launched 00:00Z, 6.6 hours before the alert went out and 49 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, Slidell Radar S, LA at 00:00Z on 2006-10-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 607 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, Slidell Radar S, LA at 00:00Z on 2006-10-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 337 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
607 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
687 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
337 m²/s²
0-3 km storm-relative helicity
463 m²/s²
Significant tornado parameter
1.3
Supercell composite
6.4

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 16, 7:22 PM CDTMesoscale DiscussionSPCBaldwin, Butler, Choctaw, Clarke, Conecuh, Dallas and 7 more53 min
Oct 16, 9:28 PM CDTMesoscale DiscussionSPCColbert, Fayette, Franklin, Lamar, Lauderdale, Lawrence and 5 more32 min
Oct 16, 11:29 PM CDTMesoscale DiscussionSPCBaldwin, Butler, Choctaw, Clarke, Conecuh, Dallas and 9 more61 min
Oct 17, 1:01 AM CDTMesoscale DiscussionSPCBaldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 12 more89 min
Oct 17, 5:23 AM CDTMesoscale DiscussionSPCBaldwin, Butler, Choctaw, Clarke, Conecuh, Dallas and 10 more97 min
Oct 17, 7:26 AM CDTMesoscale DiscussionSPCAutauga, Baldwin, Butler, Choctaw, Clarke, Conecuh and 16 more94 min
Oct 16, 9:44 PM CDTTornado WatchSPCCalhoun, Carroll, Chickasaw, Choctaw, Clay, Grenada and 12 more7 hr
Oct 17, 12:01 AM CDTMesoscale DiscussionSPCChickasaw, Choctaw, Clay, Itawamba, Lee, Lowndes and 5 more59 min

Nearby

Tornado Watches in Mississippi, 2006Tornado Watches in Louisiana, 2006Tornado Watches in Alabama, 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.