Alert archive / Georgia / Mesoscale Discussions in 2007

Mesoscale Discussion 596

April 26, 200718 counties in Alabama; 8 counties in Florida; 34 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2007, 2:12 PM CDT for 18 counties in Alabama; 8 counties in Florida; 34 counties in Georgia. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued
Apr 26, 2007, 2:12 PM CDT (19:12 UTC)
Expired
Apr 26, 2007, 3:15 PM CDT
In force
63 min
Issued by
the Storm Prediction Center
All 60 counties

Barbour County, AL, Bullock County, AL, Chambers County, AL, Coffee County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Elmore County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Lee County, AL, Macon County, AL, Montgomery County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Tallapoosa County, AL, Bay County, FL, Calhoun County, FL, Holmes County, FL, Jackson County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Calhoun County, GA, Carroll County, GA, Chattahoochee County, GA, Clay County, GA, Coweta County, GA, Crawford County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Fayette County, GA, Harris County, GA, Heard County, GA, Lamar County, GA, Lee County, GA, Macon County, GA, Marion County, GA, Meriwether County, GA, Miller County, GA, Muscogee County, GA, Pike County, GA, Quitman County, GA, Randolph County, GA, Schley County, GA, Seminole County, GA, Spalding County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taylor County, GA, Terrell County, GA, Troup County, GA, Upson County, GA, Webster County, GA

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 12:00Z, 7.2 hours before the alert went out and 173 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 12:00Z on 2007-04-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 17 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 12:00Z on 2007-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 158 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
17 J/kg
Mixed-layer CIN
-55 J/kg
Mixed-layer LCL
947 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
158 m²/s²
0-3 km storm-relative helicity
170 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
ACUS11 KWNS 261912
SWOMCD
SPC MCD 261912 
GAZ000-FLZ000-ALZ000-262015-

MESOSCALE DISCUSSION 0596
NWS STORM PREDICTION CENTER NORMAN OK
0212 PM CDT THU APR 26 2007

AREAS AFFECTED...SERN AL/WRN FL PANHANDLE/SWRN

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 

VALID 261912Z - 262015Z

...THERE IS SOME POTENTIAL THIS AFTN FOR ISOLD SVR TSTMS THIS AFTN.
THE MAIN THREATS ARE STRONG/SVR WIND GUSTS OR BRIEF TORNADOES...

DEEPLY SHEARED ENVIRONMENT CONTINUES TO BE FAVORABLE FOR
STRONG/ROTATING UPDRAFTS AS NOTED ON AREA RADARS. OF PARTICULAR
INTEREST WAS A STORM JUST NORTHEAST OF TOI EXITING NRN BULLOCK CO
ALABAMA.  THIS CELL HAD EXHIBITED A PERSISTENT LOW LEVEL
ROTATION...AND EARLIER HAD A REPORT OF FUNNEL CLOUD. ANOTHER
POTENTIAL CELL IS JUST WEST OF TOI...AT THE NRN BREAK IN THE
CONVECTIVE LINE SEGMENT. AREA VAD WIND DATA FROM MONTGOMERY AL AND
ATLANTA IS SUPPORTIVE OF ROTATING CELLS...AND THE MAIN ISSUE THUS
FAR HAS BEEN THE INSTABILITY. SFC DEWPOINTS DROP OFF INTO 40S/50S IN
CNTRL/SRN GA...AND APPEARS THE GREATEST THREAT WILL REMAIN ACROSS
SERN AL AND THE WRN FL PANHANDLE...WHERE DEWPOINTS ARE IN THE
MID/UPPER 60S.

WATCH MAY BE POSSIBLE FOR AREAS WHICH HAVE HEATED UP AHEAD OF THIS
CONVECTIVE LINE NOW EXTENDING INTO THE WRN FL PANHANDLE.

..TAYLOR.. 04/26/2007

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

ATTN...WFO...FFC...TAE...BMX...MOB...

30778459 29788539 30408728 32868605 33718520 33658451
32988391 32058383

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 25, 11:50 PM CDTMesoscale DiscussionSPCMobile, Washington85 min
Apr 26, 12:41 AM CDTTornado WatchSPCBaldwin, Choctaw, Clarke, Mobile, Washington7 hr
Apr 26, 4:46 AM CDTMesoscale DiscussionSPCBaldwin, Choctaw, Clarke, Marengo, Mobile, Monroe and 1 more89 min
Apr 26, 7:12 AM CDTMesoscale DiscussionSPCBaldwin, Clarke, Mobile, Monroe, Washington93 min
Apr 26, 2:42 PM CDTTornado WatchSPCBarbour, Bullock, Coffee, Dale, Geneva, Henry and 3 more3 hr
Apr 26, 4:33 PM CDTMesoscale DiscussionSPCCherokee, DeKalb, Etowah, Jackson, Marshall57 min
Apr 26, 4:53 PM CDTTornado WatchSPCDeKalb, Jackson, Marshall5 hr
Apr 26, 5:26 PM CDTMesoscale DiscussionSPCHenry, Houston64 min

Nearby

Mesoscale Discussions in Georgia, 2007Mesoscale Discussions in Alabama, 2007Mesoscale Discussions in Florida, 2007Every mesoscale discussion in 2007

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.