Alert archive / Georgia / Tornado Watches in 2010

Tornado Watch 732

October 27, 201025 counties in Alabama; 40 counties in Georgia; 11 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Oct 27, 2010, 5:48 AM CDT for 25 counties in Alabama; 40 counties in Georgia; 11 counties in Mississippi. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Oct 27, 2010, 5:48 AM CDT (10:48 UTC)
Expired
Oct 27, 2010, 12:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt
All 76 counties

Autauga County, AL, Bibb County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Dallas County, AL, Elmore County, AL, Etowah County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Marengo County, AL, Perry County, AL, Pickens 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, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Gordon County, GA, Greene County, GA, Gwinnett County, GA, Hall County, GA, Haralson County, GA, Heard County, GA, Henry County, GA, Jackson County, GA, Lumpkin County, GA, Madison County, GA, Morgan County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Rockdale County, GA, Towns County, GA, Troup County, GA, Union County, GA, Walton County, GA, White County, GA, Clarke County, MS, Jasper County, MS, Kemper County, MS, Lauderdale County, MS, Leake County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Scott County, MS, Smith County, MS, Winston County, MS

The radar

The Birmingham radar (KBMX), 24 km from the middle of the area, began a volume at 10:50 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
30%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
20%
One or more gusts of 65 knots or more
5%
Ten or more severe hail reports
20%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
50%

Warnings issued inside it

10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Oct 27, 6:09 AM CDTTornado WarningBMXChilton, Coosa, Shelby, Talladega36 min
Oct 27, 6:13 AM CDTTornado WarningBMXCalhoun, Clay, Cleburne, Talladega32 min
Oct 27, 6:22 AM CDTTornado WarningBMXBibb, Chilton, Perry23 min
Oct 27, 7:38 AM CDTTornado WarningBMXClay26 min
Oct 27, 8:46 AM CDTSevere Thunderstorm WarningJANNeshoba, Newton44 min
Oct 27, 8:55 AM CDTTornado WarningBMXChilton35 min
Oct 27, 9:42 AM CDTSevere Thunderstorm WarningJANLeake, Neshoba, Newton, Scott63 min
Oct 27, 9:48 AM CDTTornado WarningFFCCarroll, Coweta, Douglas, Fulton27 min
Oct 27, 10:31 AM CDTTornado WarningBMXClay, Coosa, Tallapoosa44 min
Oct 27, 11:09 AM CDTTornado WarningBMXClay, Randolph, Tallapoosa26 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 10.8 hours before the alert went out and 23 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 00:00Z on 2010-10-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1190 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 00:00Z on 2010-10-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 235 square meters per square second.19395878Sfc1 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
1190 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
942 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
235 m²/s²
0-3 km storm-relative helicity
292 m²/s²
Significant tornado parameter
1.8
Supercell composite
8.2

Open this sounding in Storm Lab

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, 7:54 AM CDTMesoscale DiscussionSPCBibb, Calhoun, Cherokee, Chilton, Choctaw, Clay and 15 more96 min
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
Oct 27, 10:54 AM CDTMesoscale DiscussionSPCGranville, Person66 min
Oct 27, 11:13 AM CDTTornado WatchSPCCaswell, Northampton, Rockingham8 hr
Oct 27, 12:46 PM CDTMesoscale DiscussionSPCAlamance, Anson, Cabarrus, Chatham, Davidson, Durham and 15 more89 min
Oct 27, 6:46 PM CDTTornado WatchSPCCaswell, Northampton, Rockingham8 hr

Nearby

Tornado Watches in Georgia, 2010Tornado Watches in Alabama, 2010Tornado Watches in Mississippi, 2010Every tornado watch 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.