Alert archive / Georgia / Mesoscale Discussions in 2009
Mesoscale Discussion 464
The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2009, 7:27 AM CDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 13, 2009, 7:27 AM CDT (12:27 UTC)
- Expired
- Apr 13, 2009, 9:30 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 44 counties
Baldwin County, AL, Coffee County, AL, Covington County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Mobile County, AL, Calhoun County, FL, Escambia County, FL, Gadsden County, FL, Holmes County, FL, Jackson County, FL, Leon County, FL, Liberty County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Brooks County, GA, Calhoun County, GA, Clay County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Lanier County, GA, Lee County, GA, Lowndes County, GA, Miller County, GA, Mitchell County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Webster County, GA, Worth County, GA, Jackson County, MS
The radar
The Eglin Afb radar (KEVX), 64 km from the middle of the area, began a volume at 12:27 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
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 0.5 hours before the alert went out and 207 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
- 138 J/kg
- Mixed-layer CIN
- -213 J/kg
- Mixed-layer LCL
- 619 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 391 m²/s²
- 0-3 km storm-relative helicity
- 472 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.0
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 |
|---|---|---|---|---|
| Apr 12, 8:07 PM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Butler, Chilton, Choctaw, Clarke and 12 more | 53 min |
| Apr 12, 8:30 PM CDT | Tornado Watch | SPC | Choctaw, Clarke, Greene, Hale, Marengo, Mobile and 2 more | 6 hr |
| Apr 12, 10:42 PM CDT | Mesoscale Discussion | SPC | Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 33 more | 93 min |
| Apr 12, 11:01 PM CDT | Tornado Watch | SPC | Autauga, Baldwin, Butler, Conecuh, Covington, Crenshaw and 8 more | 4 hr |
| Apr 13, 1:57 AM CDT | Mesoscale Discussion | SPC | Baldwin, Barbour, Bullock, Butler, Coffee, Conecuh and 13 more | 63 min |
| Apr 13, 2:33 AM CDT | Tornado Watch | SPC | Baldwin, Barbour, Bullock, Butler, Clarke, Coffee and 14 more | 7 hr |
| Apr 13, 4:32 AM CDT | Mesoscale Discussion | SPC | Baldwin, Barbour, Bullock, Butler, Coffee, Conecuh and 10 more | 58 min |
| Apr 13, 9:12 AM CDT | Tornado Watch | SPC | Coffee, Covington, Dale, Escambia, Geneva, Henry and 1 more | 9 hr |
| Apr 13, 11:15 AM CDT | Mesoscale Discussion | SPC | Baldwin, Barbour, Bullock, Butler, Clarke, Coffee and 11 more | 90 min |
| Apr 13, 12:09 PM CDT | Mesoscale Discussion | SPC | Colbert, Franklin, Lauderdale, Lawrence, Limestone, Marion and 2 more | 66 min |
| Apr 13, 12:58 PM CDT | Tornado Watch | SPC | Colbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more | 7 hr |
| Apr 13, 4:16 PM CDT | Severe Thunderstorm Watch | SPC | Choctaw | 4 hr |
| Apr 13, 5:52 PM CDT | Mesoscale Discussion | SPC | Blount, Cullman, DeKalb, Etowah, Fayette, Jackson and 10 more | 53 min |
| Apr 13, 6:55 PM CDT | Mesoscale Discussion | SPC | Bibb, Chilton, Choctaw, Clarke, Dallas, Greene and 9 more | 95 min |
| Apr 13, 11:32 AM CDT | Tornado Watch | SPC | Baker, Bradford, Clay, Columbia, Duval, Gilchrist and 5 more | 6 hr |
| Apr 13, 5:22 PM CDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Citrus, Clay, Columbia and 18 more | 83 min |
| Apr 13, 5:53 PM CDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Calhoun, Clay, Columbia and 22 more | 5 hr |
| Apr 13, 1:39 PM CDT | Mesoscale Discussion | SPC | Adams, Amite, Copiah, Covington, Forrest, Franklin and 14 more | 66 min |
Nearby
Mesoscale Discussions in Georgia, 2009Mesoscale Discussions in Florida, 2009Mesoscale Discussions in Alabama, 2009Every mesoscale discussion in 2009
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.