Alert archive / Louisiana / Mesoscale Discussions in 2005
Mesoscale Discussion 2261
The Storm Prediction Center issued this mesoscale discussion at Sep 23, 2005, 4:33 PM CDT for 4 states. It was in force for 87 min.
The area
The outline as issued.
The facts
- Issued
- Sep 23, 2005, 4:33 PM CDT (21:33 UTC)
- Expired
- Sep 23, 2005, 6:00 PM CDT
- In force
- 87 min
- Issued by
- the Storm Prediction Center
All 51 counties
Baldwin County, AL, Mobile County, AL, Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Pointe Coupee Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry 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, West Feliciana Parish, LA, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Lamar County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Stone County, MS, Walthall County, MS, Jefferson County, TX, Orange County, TX
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 9.6 hours before the alert went out and 164 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.
- 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
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>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, 2:12 PM CDT | Mesoscale Discussion | SPC | Baldwin, Mobile | 93 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, 2005Mesoscale Discussions in Mississippi, 2005Mesoscale Discussions in Alabama, 2005Every 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.