Alert archive / Louisiana / Mesoscale Discussions in 2011
Mesoscale Discussion 2109
The Storm Prediction Center issued this mesoscale discussion at Sep 3, 2011, 1:41 PM CDT for 4 states. It was in force for 64 min.
The area
The outline as issued.
The facts
- Issued
- Sep 3, 2011, 1:41 PM CDT (18:41 UTC)
- Expired
- Sep 3, 2011, 2:45 PM CDT
- In force
- 64 min
- Issued by
- the Storm Prediction Center
All 56 counties
Baldwin County, AL, Conecuh County, AL, Covington County, AL, Escambia County, AL, Mobile County, AL, Washington County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Acadia Parish, LA, Ascension Parish, LA, Assumption 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, Plaquemines 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, Amite County, MS, 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, Wilkinson County, MS
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 6.7 hours before the alert went out and 15 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
- 850 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 477 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 286 m²/s²
- 0-3 km storm-relative helicity
- 260 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 7.0
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 3, 1:43 AM CDT | Tornado Watch | SPC | Baldwin, Mobile | 8 hr |
| Sep 3, 7:46 AM CDT | Mesoscale Discussion | SPC | Baldwin, Escambia, Mobile | 119 min |
| Sep 3, 9:41 AM CDT | Tornado Watch | SPC | Baldwin, Mobile | 12 hr |
| Sep 3, 5:57 PM CDT | Mesoscale Discussion | SPC | Baldwin, Escambia, Mobile, Washington | 2 hr |
| Sep 2, 11:32 PM CDT | Mesoscale Discussion | SPC | Ascension, Assumption, East Baton Rouge, Iberia, Iberville, Jefferson and 15 more | 118 min |
Nearby
Mesoscale Discussions in Louisiana, 2011Mesoscale Discussions in Mississippi, 2011Mesoscale Discussions in Alabama, 2011Every mesoscale discussion in 2011
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.