Alert archive / Georgia / Mesoscale Discussions in 2010

Mesoscale Discussion 2017

October 27, 201021 counties in Alabama; 39 counties in Georgia; 5 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Oct 27, 2010, 7:54 AM CDT for 21 counties in Alabama; 39 counties in Georgia; 5 counties in Mississippi. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
Oct 27, 2010, 7:54 AM CDT (12:54 UTC)
Expired
Oct 27, 2010, 9:30 AM CDT
In force
96 min
Issued by
the Storm Prediction Center
All 65 counties

Bibb County, AL, Calhoun County, AL, Cherokee County, AL, Chilton County, AL, Choctaw County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Etowah County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Marengo County, AL, Perry County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Banks County, GA, Barrow County, GA, Bartow County, GA, Carroll 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, 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, Lumpkin County, GA, Madison County, GA, Oconee County, GA, Oglethorpe County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Rockdale County, GA, Towns County, GA, Union County, GA, Walton County, GA, White County, GA, Clarke County, MS, Kemper County, MS, Lauderdale County, MS, Neshoba County, MS, Newton County, MS

The radar

The Birmingham radar (KBMX), 16 km from the middle of the area, began a volume at 12:56 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 12:00Z, 0.9 hours before the alert went out and 17 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, Birmingham, AL at 12:00Z on 2010-10-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1358 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, Birmingham, AL at 12:00Z on 2010-10-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 114 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
1358 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
481 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
114 m²/s²
0-3 km storm-relative helicity
142 m²/s²
Significant tornado parameter
0.7
Supercell composite
5.0

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
Oct 26, 8:03 PM CDTTornado WatchSPCBibb, Blount, Calhoun, Cherokee, Chilton, Clay and 9 more8 hr
Oct 26, 10:51 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Clay, Cleburne and 8 more54 min
Oct 27, 5:29 AM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Chilton, Clay and 16 more61 min
Oct 27, 5:48 AM CDTTornado WatchSPCAutauga, Bibb, Calhoun, Chambers, Cherokee, Chilton and 19 more6 hr
Oct 27, 9:40 AM CDTMesoscale DiscussionSPCAutauga, Bibb, Chambers, Chilton, Choctaw, Clay and 11 more95 min
Oct 27, 11:49 AM CDTTornado WatchSPCAutauga, Bibb, Chambers, Chilton, Clay, Cleburne and 16 more7 hr
Oct 27, 2:41 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Calhoun, Chambers, Chilton, Choctaw and 23 more64 min
Oct 27, 6:40 PM CDTMesoscale DiscussionSPCAutauga, Bullock, Chambers, Chilton, Choctaw, Clarke and 15 more65 min
Oct 26, 10:05 PM CDTMesoscale DiscussionSPCFranklin, Habersham, Rabun, Stephens55 min
Oct 26, 11:24 PM CDTMesoscale DiscussionSPCFranklin, Habersham, Rabun, Stephens66 min
Oct 27, 1:44 AM CDTTornado WatchSPCFranklin, Habersham, Hart, Rabun, Stephens7 hr
Oct 27, 4:28 AM CDTMesoscale DiscussionSPCFranklin, Habersham, Hart, Rabun, Stephens, Towns and 2 more2 hr
Oct 27, 1:06 PM CDTTornado WatchSPCColumbia, Elbert, Franklin, Hart, Lincoln, McDuffie6 hr
Oct 27, 3:03 PM CDTMesoscale DiscussionSPCLincoln87 min
Oct 27, 6:53 PM CDTMesoscale DiscussionSPCColumbia, Lincoln67 min

Nearby

Mesoscale Discussions in Georgia, 2010Mesoscale Discussions in Alabama, 2010Mesoscale Discussions in Mississippi, 2010Every mesoscale discussion in 2010

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.