Alert archive / Mississippi / Mesoscale Discussions in 2012
Mesoscale Discussion 1834
The Storm Prediction Center issued this mesoscale discussion at Aug 29, 2012, 3:17 PM CDT for Baldwin County, Mobile County, Washington County, Alabama; 21 parishes in Louisiana; 29 counties in Mississippi. It was in force for 28 min.
The area
The outline as issued.
The facts
- Issued
- Aug 29, 2012, 3:17 PM CDT (20:17 UTC)
- Expired
- Aug 29, 2012, 3:45 PM CDT
- In force
- 28 min
- Issued by
- the Storm Prediction Center
All 53 counties
Baldwin County, AL, Mobile County, AL, Washington County, AL, Ascension Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberville Parish, LA, Jefferson 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 John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS, Wilkinson 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
Slidell Radar S, LA (KSIL), launched 12:00Z, 8.3 hours before the alert went out and 40 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
- 625 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 465 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 298 m²/s²
- 0-3 km storm-relative helicity
- 338 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 8.7
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 |
|---|---|---|---|---|
| Aug 29, 1:55 AM CDT | Mesoscale Discussion | SPC | Baldwin, Mobile, Washington | 2 hr |
| Aug 29, 5:46 AM CDT | Mesoscale Discussion | SPC | Baldwin, Mobile, Washington | 89 min |
| Aug 29, 6:36 AM CDT | Tornado Watch | SPC | Baldwin, Mobile, Washington | 9 hr |
| Aug 29, 11:48 AM CDT | Mesoscale Discussion | SPC | Baldwin, Mobile, Washington | 117 min |
| Aug 29, 3:53 PM CDT | Tornado Watch | SPC | Baldwin, Mobile, Washington | 8 hr |
| Aug 29, 5:45 PM CDT | Mesoscale Discussion | SPC | Barbour, Bullock, Butler, Coffee, Covington, Crenshaw and 6 more | 90 min |
Nearby
Mesoscale Discussions in Mississippi, 2012Mesoscale Discussions in Louisiana, 2012Mesoscale Discussions in Alabama, 2012Every mesoscale discussion in 2012
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.