Alert archive / Georgia / Mesoscale Discussions in 2016

Mesoscale Discussion 317

March 31, 201612 counties in Alabama; 48 counties in Georgia; 7 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2016, 7:41 PM CDT for 12 counties in Alabama; 48 counties in Georgia; 7 counties in Tennessee. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
Mar 31, 2016, 7:41 PM CDT (00:41 UTC)
Expired
Mar 31, 2016, 9:15 PM CDT
In force
94 min
Issued by
the Storm Prediction Center
All 67 counties

Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Clay County, AL, Cleburne County, AL, DeKalb County, AL, Etowah County, AL, Jackson County, AL, Lee County, AL, Marshall County, AL, Randolph County, AL, Tallapoosa County, AL, Barrow County, GA, Bartow County, GA, Butts County, GA, Carroll County, GA, Catoosa County, GA, Chattahoochee County, GA, Chattooga County, GA, Cherokee County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Dade County, GA, Dawson County, GA, DeKalb County, GA, Douglas County, GA, Fannin County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Gilmer County, GA, Gordon County, GA, Gwinnett County, GA, Hall County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Lamar County, GA, Lumpkin County, GA, Meriwether County, GA, Murray County, GA, Muscogee County, GA, Newton County, GA, Paulding County, GA, Pickens County, GA, Pike County, GA, Polk County, GA, Rockdale County, GA, Spalding County, GA, Talbot County, GA, Troup County, GA, Union County, GA, Upson County, GA, Walker County, GA, Walton County, GA, White County, GA, Whitfield County, GA, Bradley County, TN, Franklin County, TN, Grundy County, TN, Hamilton County, TN, Marion County, TN, Polk County, TN, Sequatchie County, TN

The radar

The Atlanta radar (KFFC), 109 km from the middle of the area, began a volume at 00:43 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 0.7 hours before the alert went out and 112 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.

Skew-T log-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 00:00Z on 2016-04-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 138 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 00:00Z on 2016-04-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 260 square meters per square second.1939587897117136Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
138 J/kg
Mixed-layer CIN
-65 J/kg
Mixed-layer LCL
960 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
260 m²/s²
0-3 km storm-relative helicity
286 m²/s²
Significant tornado parameter
0.1
Supercell composite
2.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 31, 8:14 PM CDTTornado WatchSPCBarbour, Bullock, Calhoun, Chambers, Cherokee, Clay and 8 more18 hr
Mar 31, 10:11 PM CDTMesoscale DiscussionSPCAutauga, Bullock, Calhoun, Chambers, Cherokee, Chilton and 14 more64 min
Apr 1, 2:03 AM CDTMesoscale DiscussionSPCAutauga, Bullock, Dallas, Elmore, Lee, Lowndes and 5 more57 min
Apr 1, 4:46 AM CDTMesoscale DiscussionSPCBarbour, Bullock, Coffee, Crenshaw, Dale, Henry and 2 more89 min
Apr 1, 6:26 AM CDTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston12 hr
Apr 1, 10:40 AM CDTMesoscale DiscussionSPCBarbour, Coffee, Dale, Geneva, Henry, Houston and 2 more2 hr
Apr 1, 1:00 PM CDTMesoscale DiscussionSPCHenry, Houston60 min
Mar 31, 7:09 PM CDTMesoscale DiscussionSPCBrooks, Colquitt, Cook, Decatur, Grady, Lowndes and 3 more96 min
Apr 1, 12:31 AM CDTMesoscale DiscussionSPCBaldwin, Bleckley, Burke, Columbia, Dodge, Elbert and 18 more89 min
Apr 1, 1:48 PM CDTTornado WatchSPCAppling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 50 more6 hr
Apr 1, 4:40 PM CDTMesoscale DiscussionSPCBrantley, Bryan, Camden, Charlton, Chatham, Clinch and 9 more65 min

Nearby

Mesoscale Discussions in Georgia, 2016Mesoscale Discussions in Alabama, 2016Mesoscale Discussions in Tennessee, 2016Every mesoscale discussion in 2016

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.