Alert archive / Louisiana / Severe Thunderstorm Watches in 2005

Severe Thunderstorm Watch 196

April 22, 200516 parishes in Louisiana; 16 counties in Mississippi

The Storm Prediction Center issued this severe thunderstorm watch at Apr 22, 2005, 6:40 PM CDT for 16 parishes in Louisiana; 16 counties in Mississippi. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Apr 22, 2005, 6:40 PM CDT (23:40 UTC)
Expired
Apr 23, 2005, 2:00 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
All 32 counties

Ascension Parish, LA, Avoyelles Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberville Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Jefferson Davis County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Pike County, MS, Simpson County, MS, Stone County, MS, Walthall County, MS, Wilkinson County, MS

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 22, 6:45 PM CDTSevere Thunderstorm WarningLIXAmite, Wilkinson45 min
Apr 22, 7:17 PM CDTSevere Thunderstorm WarningLIXIberville28 min
Apr 22, 7:18 PM CDTSevere Thunderstorm WarningJANCovington, Simpson, Smith57 min
Apr 22, 7:44 PM CDTSevere Thunderstorm WarningLIXPike, Walthall31 min
Apr 22, 7:53 PM CDTSevere Thunderstorm WarningLIXAmite37 min
Apr 22, 7:59 PM CDTSevere Thunderstorm WarningJANMarion46 min
Apr 22, 8:17 PM CDTSevere Thunderstorm WarningJANJefferson Davis, Lawrence, Lincoln, Marion43 min
Apr 22, 8:18 PM CDTSevere Thunderstorm WarningJANLamar42 min
Apr 22, 8:26 PM CDTSevere Thunderstorm WarningJANForrest34 min
Apr 22, 8:34 PM CDTSevere Thunderstorm WarningLIXTangipahoa, Washington26 min
Apr 22, 8:40 PM CDTSevere Thunderstorm WarningJANCovington, Jefferson Davis65 min
Apr 22, 8:57 PM CDTSevere Thunderstorm WarningJANForrest48 min
Apr 22, 9:02 PM CDTSevere Thunderstorm WarningLIXWashington43 min
Apr 22, 9:12 PM CDTSevere Thunderstorm WarningLIXTangipahoa18 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 12:00Z, 11.7 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.

Skew-T log-pSkew-T log-p diagram, Slidell Radar S, LA at 12:00Z on 2005-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 805 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, Slidell Radar S, LA at 12:00Z on 2005-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 49 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
805 J/kg
Mixed-layer CIN
-78 J/kg
Mixed-layer LCL
732 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
49 m²/s²
0-3 km storm-relative helicity
90 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 22, 11:06 AM CDTMesoscale DiscussionSPCAvoyelles, Caldwell, Catahoula, Concordia, De Soto, Franklin and 10 more114 min
Apr 22, 11:30 AM CDTSevere Thunderstorm WatchSPCAllen, Avoyelles, Beauregard, Caldwell, Catahoula, Concordia and 12 more8 hr
Apr 22, 2:25 PM CDTMesoscale DiscussionSPCAllen, Avoyelles, Beauregard, Caldwell, Catahoula, Concordia and 12 more95 min
Apr 22, 5:36 AM CDTMesoscale DiscussionSPCAlcorn, Itawamba, Lee, Prentiss, Tippah, Tishomingo and 1 more84 min
Apr 22, 9:15 AM CDTMesoscale DiscussionSPCAttala, Choctaw, Clay, Holmes, Kemper, Leake and 10 more90 min
Apr 22, 9:50 AM CDTSevere Thunderstorm WatchSPCAttala, Choctaw, Clarke, Clay, Jasper, Kemper and 11 more5 hr
Apr 22, 12:41 PM CDTMesoscale DiscussionSPCClarke, Jasper, Lauderdale, Newton64 min
Apr 22, 2:35 PM CDTSevere Thunderstorm WatchSPCAttala, Choctaw, Clarke, Greene, Jasper, Jones and 11 more6 hr
Apr 22, 2:49 PM CDTMesoscale DiscussionSPCAlcorn, Itawamba, Lee, Pontotoc, Prentiss, Tishomingo86 min

Nearby

Severe Thunderstorm Watches in Louisiana, 2005Severe Thunderstorm Watches in Mississippi, 2005Every severe thunderstorm watch in 2005

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.