Alert archive / Louisiana / Mesoscale Discussions in 2003

Mesoscale Discussion 2550

November 23, 200312 parishes in Louisiana; 7 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Nov 23, 2003, 12:15 PM CST for 12 parishes in Louisiana; 7 counties in Texas. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Nov 23, 2003, 12:15 PM CST (18:15 UTC)
Expired: Nov 23, 2003, 2:45 PM CST
In force: 3 hr
Issued by: the Storm Prediction Center

Counties Beauregard Parish, LA, Bienville Parish, LA, Calcasieu Parish, LA, Grant Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Winn Parish, LA, Chambers County, TX, Hardin County, TX, Jasper County, TX, Jefferson County, TX, Newton County, TX, Orange County, TX, Sabine County, TX

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 972Nov 23, 1:40 PM CST

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 6.3 hours before the alert went out and 116 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 14 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 1013 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 235 m²/s²
0-3 km storm-relative helicity: 261 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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.

Issued	Product	Office	Counties	Lasted
Nov 23, 1:40 PM CST	Severe Thunderstorm Watch	SPC	Bienville, Caldwell, East Carroll, Franklin, Jackson, Lincoln and 8 more	5 hr
Nov 23, 3:48 PM CST	Mesoscale Discussion	SPC	Caldwell, East Carroll, Franklin, Madison, Morehouse, Ouachita and 3 more	117 min
Nov 23, 5:38 PM CST	Mesoscale Discussion	SPC	Acadia, Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia and 21 more	97 min

Nearby

Mesoscale Discussions in Louisiana, 2003 Mesoscale Discussions in Texas, 2003 Every 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.