Alert archive / Louisiana / Mesoscale Discussions in 2007
Mesoscale Discussion 2245
The Storm Prediction Center issued this mesoscale discussion at Dec 20, 2007, 8:48 AM CST for 25 parishes in Louisiana; Amite County, Pike County, Wilkinson County, Mississippi. It was in force for 57 min.
The area
The outline as issued.
The facts
- Issued
- Dec 20, 2007, 8:48 AM CST (14:48 UTC)
- Expired
- Dec 20, 2007, 9:45 AM CST
- In force
- 57 min
- Issued by
- the Storm Prediction Center
All 28 counties
Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Livingston Parish, LA, Pointe Coupee 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, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Amite County, MS, Pike 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
Lake Charles Mun, LA (KLCH), launched 12:00Z, 2.8 hours before the alert went out and 173 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
- 775 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 578 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 211 m²/s²
- 0-3 km storm-relative helicity
- 252 m²/s²
- Significant tornado parameter
- 1.1
- Supercell composite
- 4.5
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 |
|---|---|---|---|---|
| Dec 19, 10:12 PM CST | Mesoscale Discussion | SPC | Allen, Beauregard, Calcasieu, Sabine, Vernon | 93 min |
| Dec 20, 3:30 AM CST | Mesoscale Discussion | SPC | Acadia, Allen, Beauregard, Bienville, Bossier, Caddo and 14 more | 90 min |
| Dec 20, 9:15 AM CST | Tornado Watch | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 30 more | 7 hr |
| Dec 20, 11:21 AM CST | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 30 more | 84 min |
| Dec 20, 1:06 PM CST | Mesoscale Discussion | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 21 more | 84 min |
| Dec 20, 10:01 AM CST | Tornado Watch | SPC | Clarke, Covington, Forrest, George, Greene, Jasper and 6 more | 5 hr |
| Dec 20, 1:03 PM CST | Mesoscale Discussion | SPC | Jackson | 57 min |
Nearby
Mesoscale Discussions in Louisiana, 2007Mesoscale Discussions in Mississippi, 2007Every mesoscale discussion in 2007
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.