Alert archive / Louisiana / Mesoscale Discussions in 2003

Mesoscale Discussion 2562

November 27, 20038 parishes in Louisiana; Jefferson County, Texas

The Storm Prediction Center issued this mesoscale discussion at Nov 27, 2003, 7:49 AM CST for 8 parishes in Louisiana; Jefferson County, Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Nov 27, 2003, 7:49 AM CST (13:49 UTC)
Expired
Nov 27, 2003, 10:15 AM CST
In force
2 hr
Issued by
the Storm Prediction Center

Counties Acadia Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Iberia Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Saint Martin Parish, LA, Vermilion Parish, LA, Jefferson County, TX

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 1.8 hours before the alert went out and 310 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 2003-11-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 913 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 12:00Z on 2003-11-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 305 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
913 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
490 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
305 m²/s²
0-3 km storm-relative helicity
321 m²/s²
Significant tornado parameter
1.7
Supercell composite
11.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 26, 6:55 PM CSTSevere Thunderstorm WatchSPCBeauregard, Bossier, Caddo, Calcasieu, Cameron, De Soto and 4 more6 hr
Nov 26, 9:18 PM CSTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 48 more87 min
Nov 26, 9:55 PM CSTTornado WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 19 more5 hr
Nov 26, 11:41 PM CSTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Cameron and 18 more94 min
Nov 27, 1:36 AM CSTMesoscale DiscussionSPCBienville, Caldwell, Catahoula, Claiborne, Concordia, East Carroll and 13 more2 hr
Nov 27, 2:31 AM CSTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 19 more59 min
Nov 27, 3:00 AM CSTTornado WatchSPCAcadia, Ascension, Assumption, Cameron, East Baton Rouge, East Feliciana and 16 more5 hr
Nov 27, 5:03 AM CSTMesoscale DiscussionSPCAcadia, Ascension, Assumption, Cameron, East Baton Rouge, East Feliciana and 16 more117 min
Nov 27, 5:25 AM CSTTornado WatchSPCAscension, Assumption, East Baton Rouge, Jefferson, Lafourche, Livingston and 11 more6 hr
Nov 27, 7:48 AM CSTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, Jefferson, Lafourche, Livingston and 10 more117 min
Nov 27, 9:53 AM CSTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, Jefferson, Lafourche, Livingston and 10 more2 hr

Nearby

Mesoscale Discussions in Louisiana, 2003Mesoscale Discussions in Texas, 2003Every mesoscale discussion in 2003

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.