Alert archive / Alabama / Mesoscale Discussions in 2014
Mesoscale Discussion 135
The Storm Prediction Center issued this mesoscale discussion at Feb 20, 2014, 11:43 PM CST for 4 states. It was in force for 62 min.
The area
The outline as issued.
The facts
- Issued
- Feb 20, 2014, 11:43 PM CST (05:43 UTC)
- Expired
- Feb 21, 2014, 12:45 AM CST
- In force
- 62 min
- Issued by
- the Storm Prediction Center
All 73 counties
Autauga County, AL, Baldwin County, AL, Barbour County, AL, Bibb County, AL, Blount County, AL, Bullock County, AL, Butler County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Clay County, AL, Cleburne County, AL, Coffee County, AL, Conecuh County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Dallas County, AL, Elmore County, AL, Escambia County, AL, Etowah County, AL, Geneva County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Montgomery County, AL, Perry County, AL, Pickens County, AL, Pike County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, Saint Helena Parish, LA, Washington Parish, LA, Clarke County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Jackson County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Marion County, MS, Newton County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS
The radar
The Birmingham radar (KBMX), 141 km from the middle of the area, began a volume at 05:43 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Birmingham, AL (KBMX), launched 00:00Z, 5.7 hours before the alert went out and 142 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
- 755 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 734 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 181 m²/s²
- 0-3 km storm-relative helicity
- 208 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 3.7
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 |
|---|---|---|---|---|
| Feb 20, 6:05 PM CST | Tornado Watch | SPC | Bibb, Choctaw, Clarke, Dallas, Greene, Hale and 7 more | 7 hr |
| Feb 20, 6:49 PM CST | Tornado Watch | SPC | Autauga, Blount, Calhoun, Cherokee, Chilton, Clay and 25 more | 6 hr |
| Feb 20, 8:01 PM CST | Mesoscale Discussion | SPC | Colbert, Franklin, Jackson, Lauderdale, Lawrence, Limestone and 5 more | 89 min |
| Feb 20, 9:56 PM CST | Mesoscale Discussion | SPC | Bibb, Choctaw, Clarke, Greene, Hale, Marengo and 6 more | 2 hr |
| Feb 21, 12:58 AM CST | Severe Thunderstorm Watch | SPC | Autauga, Baldwin, Barbour, Bibb, Blount, Bullock and 40 more | 7 hr |
| Feb 21, 3:33 AM CST | Mesoscale Discussion | SPC | Barbour, Coffee, Dale, Geneva, Henry, Houston and 2 more | 87 min |
| Feb 21, 5:39 AM CST | Severe Thunderstorm Watch | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 17 more | 9 hr |
| Feb 21, 7:17 AM CST | Mesoscale Discussion | SPC | Baker, Columbia, Hamilton, Jefferson, Madison, Suwannee | 118 min |
| Feb 21, 9:13 AM CST | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 17 more | 92 min |
| Feb 21, 11:43 AM CST | Mesoscale Discussion | SPC | Baker, Columbia, Hamilton, Jefferson, Lafayette, Leon and 5 more | 62 min |
| Feb 20, 6:55 PM CST | Mesoscale Discussion | SPC | Allen, Beauregard, Calcasieu, Caldwell, Catahoula, East Carroll and 14 more | 95 min |
| Feb 20, 7:22 PM CST | Tornado Watch | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 32 more | 8 hr |
Nearby
Mesoscale Discussions in Alabama, 2014Mesoscale Discussions in Mississippi, 2014Mesoscale Discussions in Florida, 2014Every mesoscale discussion in 2014
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; radar from the NEXRAD Level II archive.