Alert archive / Louisiana / Mesoscale Discussions in 2011
Mesoscale Discussion 2100
The Storm Prediction Center issued this mesoscale discussion at Sep 2, 2011, 11:32 PM CDT for 21 parishes in Louisiana; Hancock County, Harrison County, Jackson County, Mississippi. It was in force for 118 min.
The area
The outline as issued.
The facts
- Issued
- Sep 2, 2011, 11:32 PM CDT (04:32 UTC)
- Expired
- Sep 3, 2011, 1:30 AM CDT
- In force
- 118 min
- Issued by
- the Storm Prediction Center
All 24 counties
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, Plaquemines 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, West Baton Rouge Parish, LA, Hancock County, MS, Harrison County, MS, Jackson County, MS
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Jackson, MS (KJAN), launched 00:00Z, 4.5 hours before the alert went out and 277 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1978 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 67 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 3, 1:43 AM CDT | Tornado Watch | SPC | Ascension, Assumption, Jefferson, Lafourche, Livingston, Orleans and 10 more | 8 hr |
| Sep 3, 7:46 AM CDT | Mesoscale Discussion | SPC | Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 3 more | 119 min |
| Sep 3, 9:41 AM CDT | Tornado Watch | SPC | Acadia, Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia and 24 more | 12 hr |
| Sep 3, 1:41 PM CDT | Mesoscale Discussion | SPC | Acadia, Ascension, Assumption, East Baton Rouge, East Feliciana, Evangeline and 25 more | 64 min |
| Sep 3, 5:57 PM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Concordia and 28 more | 2 hr |
Nearby
Mesoscale Discussions in Louisiana, 2011Mesoscale Discussions in Mississippi, 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.