Alert archive / Georgia / Mesoscale Discussions in 2006

Mesoscale Discussion 592

April 20, 20064 counties in Alabama; 55 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 20, 2006, 7:55 PM CDT for 4 counties in Alabama; 55 counties in Georgia. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 20, 2006, 7:55 PM CDT (00:55 UTC)
Expired
Apr 20, 2006, 10:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 59 counties

Cherokee County, AL, Clay County, AL, Cleburne County, AL, Randolph County, AL, Banks County, GA, Barrow County, GA, Bartow County, GA, Butts County, GA, Carroll County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Dawson County, GA, DeKalb County, GA, Douglas County, GA, Fannin County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Franklin County, GA, Fulton County, GA, Gilmer County, GA, Gordon County, GA, Gwinnett County, GA, Habersham County, GA, Hall County, GA, Haralson County, GA, Heard County, GA, Henry County, GA, Jackson County, GA, Jasper County, GA, Lamar County, GA, Lumpkin County, GA, Madison County, GA, Meriwether County, GA, Morgan County, GA, Murray County, GA, Newton County, GA, Oconee County, GA, Paulding County, GA, Pickens County, GA, Pike County, GA, Polk County, GA, Putnam County, GA, Rabun County, GA, Rockdale County, GA, Spalding County, GA, Stephens County, GA, Towns County, GA, Troup County, GA, Union County, GA, Walker County, GA, Walton County, GA, White County, GA, Whitfield County, GA

The radar

The Atlanta radar (KFFC), 73 km from the middle of the area, began a volume at 00:54 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 nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 0.9 hours before the alert went out and 73 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 2006-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 790 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 2006-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 square meters per square second.193958Sfc1 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
790 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
1757 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
58 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 20, 10:53 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Chilton, Colbert, Cullman and 14 more97 min
Apr 21, 2:15 AM CDTMesoscale DiscussionSPCBlount, Cherokee, Colbert, Cullman, DeKalb, Etowah and 13 more2 hr
Apr 21, 5:00 AM CDTMesoscale DiscussionSPCColbert, Franklin, Lauderdale, Lawrence, Limestone, Marion and 2 more60 min
Apr 21, 12:17 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Chilton, Clay and 17 more88 min
Apr 21, 12:52 PM CDTMesoscale DiscussionSPCBaldwin, Choctaw, Clarke, Dallas, Greene, Hale and 7 more83 min
Apr 21, 1:24 PM CDTSevere Thunderstorm WatchSPCAutauga, Baldwin, Bibb, Blount, Butler, Calhoun and 45 more8 hr
Apr 21, 3:39 PM CDTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Bullock, Butler, Calhoun and 37 more66 min
Apr 21, 3:33 PM CDTTornado WatchSPCBartow, Catoosa, Chattooga, Cherokee, Dade, Dawson and 12 more6 hr
Apr 21, 6:22 PM CDTMesoscale DiscussionSPCColumbia, Elbert, Franklin, Hart, Lincoln, McDuffie and 7 more83 min

Nearby

Mesoscale Discussions in Georgia, 2006Mesoscale Discussions in Alabama, 2006Every mesoscale discussion in 2006

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.