Alert archive / Louisiana / Severe Thunderstorm Watches in 2005

Severe Thunderstorm Watch 40

February 24, 2005Jefferson Parish, Plaquemines Parish, Louisiana

The Storm Prediction Center issued this severe thunderstorm watch at Feb 24, 2005, 3:05 PM CST for Jefferson Parish, Plaquemines Parish, Louisiana. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Feb 24, 2005, 3:05 PM CST (21:05 UTC)
Expired
Feb 24, 2005, 7:00 PM CST
In force
4 hr
Issued by
the Storm Prediction Center

Counties Jefferson Parish, LA, Plaquemines Parish, LA

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Feb 24, 3:16 PM CSTSevere Thunderstorm WarningLIXJefferson, Lafourche, Terrebonne59 min
Feb 24, 4:08 PM CSTSevere Thunderstorm WarningLIXJefferson, Plaquemines67 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, 9.1 hours before the alert went out and 117 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 2005-02-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2005-02-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
666 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
34 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 24, 2:55 PM CSTMesoscale DiscussionSPCJefferson, Lafourche, Plaquemines3 hr

Nearby

Severe Thunderstorm Watches in Louisiana, 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.