Alert archive / Louisiana / Mesoscale Discussions in 2005

Mesoscale Discussion 2263

September 24, 200515 parishes in Louisiana

The Storm Prediction Center issued this mesoscale discussion at Sep 24, 2005, 1:36 AM CDT for 15 parishes in Louisiana. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Sep 24, 2005, 1:36 AM CDT (06:36 UTC)
Expired: Sep 24, 2005, 2:30 AM CDT
In force: 54 min
Issued by: the Storm Prediction Center

Counties Ascension Parish, LA, Assumption Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Plaquemines Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Vermilion Parish, LA, West Baton Rouge Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 6.6 hours before the alert went out and 146 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: 1419 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 659 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 223 m²/s²
0-3 km storm-relative helicity: 299 m²/s²
Significant tornado parameter: 1.8
Supercell composite: 12.4

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
Sep 24, 5:13 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 47 more	32 min
Sep 24, 5:45 AM CDT	Tornado Watch	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 45 more	7 hr
Sep 24, 10:27 AM CDT	Mesoscale Discussion	SPC	Acadia, Ascension, Assumption, Avoyelles, Bienville, Caldwell and 45 more	2 hr
Sep 24, 12:30 PM CDT	Tornado Watch	SPC	Ascension, Assumption, Avoyelles, Caldwell, Catahoula, Concordia and 30 more	3 hr
Sep 24, 12:49 PM CDT	Mesoscale Discussion	SPC	Bossier, Caddo, De Soto, Webster	3 hr
Sep 24, 2:57 PM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, Avoyelles, Caldwell, Catahoula, Concordia and 30 more	93 min
Sep 24, 4:20 PM CDT	Tornado Watch	SPC	Ascension, Assumption, Avoyelles, Caldwell, Catahoula, Concordia and 30 more	5 hr
Sep 24, 6:07 PM CDT	Mesoscale Discussion	SPC	Ascension, Caldwell, Catahoula, Concordia, East Baton Rouge, East Carroll and 22 more	83 min

Nearby

Mesoscale Discussions in Louisiana, 2005 Every mesoscale discussion 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.