Alert archive / Louisiana / Mesoscale Discussions in 2005

Mesoscale Discussion 2257

September 23, 2005Baldwin County, Mobile County, Alabama; 23 parishes in Louisiana; 6 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Sep 23, 2005, 2:12 PM CDT for Baldwin County, Mobile County, Alabama; 23 parishes in Louisiana; 6 counties in Mississippi. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Sep 23, 2005, 2:12 PM CDT (19:12 UTC)
Expired: Sep 23, 2005, 3:45 PM CDT
In force: 93 min
Issued by: the Storm Prediction Center

All 31 counties

Baldwin County, AL, Mobile County, AL, Acadia Parish, LA, Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Vermilion Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, George County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Pearl River County, MS, Stone County, MS

The watches that followed

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

Tornado Watch 810Sep 23, 5:10 PM CDT

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.2 hours before the alert went out and 98 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: 377 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 686 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 268 m²/s²
0-3 km storm-relative helicity: 298 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
Sep 23, 9:55 AM CDT	Tornado Watch	SPC	Baldwin, Mobile	7 hr
Sep 23, 4:33 PM CDT	Mesoscale Discussion	SPC	Baldwin, Mobile	87 min
Sep 23, 5:10 PM CDT	Tornado Watch	SPC	Baldwin, Clarke, Mobile, Washington	13 hr
Sep 23, 7:44 AM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, Cameron, Iberville, Lafayette, Orleans and 5 more	91 min

Nearby

Mesoscale Discussions in Louisiana, 2005 Mesoscale Discussions in Mississippi, 2005 Mesoscale Discussions in Alabama, 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.