Alert archive / Georgia / Mesoscale Discussions in 2005

Mesoscale Discussion 2113

August 29, 200521 counties in Alabama; 24 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Aug 29, 2005, 3:23 PM CDT for 21 counties in Alabama; 24 counties in Georgia. It was in force for 37 min.

The area

The outline as issued.

The facts

Issued
Aug 29, 2005, 3:23 PM CDT (20:23 UTC)
Expired
Aug 29, 2005, 4:00 PM CDT
In force
37 min
Issued by
the Storm Prediction Center
All 45 counties

Blount County, AL, Calhoun County, AL, Cherokee County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Fayette County, AL, Franklin County, AL, Jackson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, St. Clair County, AL, Walker County, AL, Winston County, AL, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Cobb County, GA, Dade County, GA, Dawson County, GA, DeKalb County, GA, Douglas County, GA, Fannin County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Gilmer County, GA, Gordon County, GA, Gwinnett County, GA, Haralson County, GA, Murray County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Rockdale County, GA, Walker County, GA, Whitfield County, GA

The radar

The Birmingham radar (KBMX), 99 km from the middle of the area, began a volume at 20:26 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, 8.4 hours before the alert went out and 98 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 2005-08-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 606 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 2005-08-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 217 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
606 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
692 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
217 m²/s²
0-3 km storm-relative helicity
214 m²/s²
Significant tornado parameter
0.5
Supercell composite
3.0

Open this sounding in Storm Lab

The text

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

000 
ACUS11 KWNS 292023
SWOMCD
SPC MCD 292023 
GAZ000-ALZ000-MSZ000-292100-

MESOSCALE DISCUSSION 2113
NWS STORM PREDICTION CENTER NORMAN OK
0323 PM CDT MON AUG 29 2005

AREAS AFFECTED...NRN AL / NWRN GA

CONCERNING...TORNADO THREAT 

VALID 292023Z - 292100Z

A TORNADO WATCH WILL BE ISSUED SHORTLY FOR NRN AL AND NWRN GA.

POTENTIALLY TORNADIC CELLS WILL CONTINUE TO MOVE NWD INTO THE AREA
WITH PERIODIC MESOCYCLONE AND TORNADO DEVELOPMENT WITHIN CONVERGENT
BANDS.

..JEWELL.. 08/29/2005

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...FFC...BMX...HUN...MEG...

34298827 34918811 34918419 33648382 33668420 33688530
33708661 33728811 33748820 34078825

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 28, 10:16 PM CDTMesoscale DiscussionSPCBaldwin, Butler, Clarke, Conecuh, Covington, Escambia and 3 more119 min
Aug 29, 1:26 AM CDTMesoscale DiscussionSPCBaldwin, Butler, Choctaw, Clarke, Coffee, Conecuh and 8 more34 min
Aug 29, 2:00 AM CDTTornado WatchSPCBaldwin, Butler, Clarke, Conecuh, Covington, Crenshaw and 5 more8 hr
Aug 29, 6:33 AM CDTMesoscale DiscussionSPCBaldwin, Butler, Clarke, Conecuh, Covington, Escambia and 4 more117 min
Aug 29, 7:41 AM CDTMesoscale DiscussionSPCBarbour, Coffee, Dale, Geneva, Henry, Houston and 1 more94 min
Aug 29, 9:36 AM CDTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bibb, Bullock, Butler and 37 more84 min
Aug 29, 10:25 AM CDTTornado WatchSPCAutauga, Baldwin, Barbour, Bibb, Bullock, Butler and 38 more8 hr
Aug 29, 1:04 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bibb, Bullock, Butler and 38 more86 min
Aug 29, 3:25 PM CDTTornado WatchSPCBlount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 17 more3 hr
Aug 29, 5:42 PM CDTMesoscale DiscussionSPCBibb, Chilton, Colbert, Cullman, Fayette, Franklin and 11 more3 hr
Aug 29, 6:12 PM CDTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Blount, Bullock, Butler and 49 more63 min
Aug 29, 6:40 PM CDTTornado WatchSPCAutauga, Barbour, Bibb, Blount, Bullock, Butler and 40 more10 hr

Nearby

Mesoscale Discussions in Georgia, 2005Mesoscale Discussions in Alabama, 2005Every mesoscale discussion in 2005

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.