Alert archive / Georgia / Mesoscale Discussions in 2013
Mesoscale Discussion 280
The Storm Prediction Center issued this mesoscale discussion at Mar 18, 2013, 4:57 PM CDT for 17 counties in Alabama; 81 counties in Georgia. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 18, 2013, 4:57 PM CDT (21:57 UTC)
- Expired
- Mar 18, 2013, 7:00 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 98 counties
Barbour County, AL, Bullock County, AL, Calhoun County, AL, Chambers County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Elmore County, AL, Lee County, AL, Macon County, AL, Montgomery County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Baldwin County, GA, Barrow County, GA, Bibb County, GA, Bleckley County, GA, Butts County, GA, Candler County, GA, Carroll County, GA, Chattahoochee County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Crawford County, GA, Crisp County, GA, DeKalb County, GA, Dodge County, GA, Dooly County, GA, Douglas County, GA, Emanuel County, GA, Evans County, GA, Fayette County, GA, Fulton County, GA, Glascock County, GA, Greene County, GA, Gwinnett County, GA, Hancock County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Houston County, GA, Jasper County, GA, Jefferson County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, Laurens County, GA, Lee County, GA, Macon County, GA, Marion County, GA, McDuffie County, GA, Meriwether County, GA, Monroe County, GA, Montgomery County, GA, Morgan County, GA, Muscogee County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Paulding County, GA, Peach County, GA, Pike County, GA, Polk County, GA, Pulaski County, GA, Putnam County, GA, Quitman County, GA, Randolph County, GA, Rockdale County, GA, Schley County, GA, Spalding County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taliaferro County, GA, Tattnall County, GA, Taylor County, GA, Telfair County, GA, Terrell County, GA, Toombs County, GA, Treutlen County, GA, Troup County, GA, Turner County, GA, Twiggs County, GA, Upson County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Webster County, GA, Wheeler County, GA, Wilcox County, GA, Wilkinson County, GA
The radar
The Atlanta radar (KFFC), 76 km from the middle of the area, began a volume at 21:58 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
Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 10.0 hours before the alert went out and 77 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
- 3 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 540 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Mar 18, 7:40 AM CDT | Mesoscale Discussion | SPC | Lauderdale, Limestone | 2 hr |
| Mar 18, 8:09 AM CDT | Severe Thunderstorm Watch | SPC | Colbert, Cullman, DeKalb, Fayette, Franklin, Jackson and 10 more | 7 hr |
| Mar 18, 12:44 PM CDT | Mesoscale Discussion | SPC | Blount, Cherokee, Colbert, Cullman, DeKalb, Etowah and 15 more | 91 min |
| Mar 18, 1:10 PM CDT | Mesoscale Discussion | SPC | Bibb, Blount, Calhoun, Cherokee, Chilton, Cullman and 21 more | 65 min |
| Mar 18, 1:11 PM CDT | Mesoscale Discussion | SPC | Autauga, Barbour, Bullock, Butler, Chambers, Coffee and 19 more | 94 min |
| Mar 18, 1:31 PM CDT | Severe Thunderstorm Watch | SPC | Bibb, Blount, Calhoun, Cherokee, Cleburne, Colbert and 28 more | 8 hr |
| Mar 18, 3:16 PM CDT | Tornado Watch | SPC | Autauga, Barbour, Bullock, Chambers, Chilton, Clay and 10 more | 6 hr |
| Mar 18, 4:28 PM CDT | Mesoscale Discussion | SPC | Butler, Choctaw, Clarke, Conecuh, Covington, Monroe and 2 more | 32 min |
| Mar 18, 4:34 PM CDT | Severe Thunderstorm Watch | SPC | Butler, Choctaw, Clarke, Conecuh, Crenshaw, Monroe and 2 more | 5 hr |
| Mar 18, 6:29 PM CDT | Severe Thunderstorm Watch | SPC | Appling, Bacon, Bryan, Bulloch, Burke, Candler and 24 more | 6 hr |
Nearby
Mesoscale Discussions in Georgia, 2013Mesoscale Discussions in Alabama, 2013Every mesoscale discussion in 2013
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.