Alert archive / Louisiana / Mesoscale Discussions in 2007
Mesoscale Discussion 591
The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2007, 11:50 PM CDT for Mobile County, Washington County, Alabama; 15 parishes in Louisiana; 15 counties in Mississippi. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Apr 25, 2007, 11:50 PM CDT (04:50 UTC)
- Expired
- Apr 26, 2007, 1:15 AM CDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
All 32 counties
Mobile County, AL, Washington County, AL, Ascension Parish, LA, Assumption Parish, LA, Jefferson 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 Tammany Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Washington Parish, LA, Clarke County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jones County, MS, Lamar County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS, Wayne 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 00:00Z, 4.8 hours before the alert went out and 10 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
- 583 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 1060 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 77 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.5
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 |
|---|---|---|---|---|
| Apr 26, 12:41 AM CDT | Tornado Watch | SPC | Baldwin, Choctaw, Clarke, Mobile, Washington | 7 hr |
| Apr 26, 4:46 AM CDT | Mesoscale Discussion | SPC | Baldwin, Choctaw, Clarke, Marengo, Mobile, Monroe and 1 more | 89 min |
| Apr 26, 7:12 AM CDT | Mesoscale Discussion | SPC | Baldwin, Clarke, Mobile, Monroe, Washington | 93 min |
| Apr 26, 2:12 PM CDT | Mesoscale Discussion | SPC | Barbour, Bullock, Chambers, Coffee, Covington, Crenshaw and 12 more | 63 min |
| Apr 26, 2:42 PM CDT | Tornado Watch | SPC | Barbour, Bullock, Coffee, Dale, Geneva, Henry and 3 more | 3 hr |
| Apr 26, 4:33 PM CDT | Mesoscale Discussion | SPC | Cherokee, DeKalb, Etowah, Jackson, Marshall | 57 min |
| Apr 26, 4:53 PM CDT | Tornado Watch | SPC | DeKalb, Jackson, Marshall | 5 hr |
| Apr 26, 5:26 PM CDT | Mesoscale Discussion | SPC | Henry, Houston | 64 min |
Nearby
Mesoscale Discussions in Louisiana, 2007Mesoscale Discussions in Mississippi, 2007Mesoscale Discussions in Alabama, 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.