Alert archive / Georgia / Mesoscale Discussions in 2012
Mesoscale Discussion 43
The Storm Prediction Center issued this mesoscale discussion at Jan 21, 2012, 1:57 PM CST for 10 counties in Alabama; 84 counties in Georgia; 19 counties in South Carolina. It was in force for 63 min.
The area
The outline as issued.
The facts
- Issued
- Jan 21, 2012, 1:57 PM CST (19:57 UTC)
- Expired
- Jan 21, 2012, 3:00 PM CST
- In force
- 63 min
- Issued by
- the Storm Prediction Center
All 113 counties
Barbour County, AL, Bullock County, AL, Chambers County, AL, Clay County, AL, Henry County, AL, Lee County, AL, Macon County, AL, Randolph County, AL, Russell County, AL, Tallapoosa County, AL, Baldwin County, GA, Barrow County, GA, Bibb County, GA, Bleckley County, GA, Bulloch County, GA, Burke County, GA, Butts County, GA, Calhoun County, GA, Candler County, GA, Carroll County, GA, Chattahoochee County, GA, Clarke County, GA, Clay County, GA, Clayton County, GA, Columbia County, GA, Coweta County, GA, Crawford County, GA, Crisp County, GA, DeKalb County, GA, Dodge County, GA, Dooly County, GA, Douglas County, GA, Elbert County, GA, Emanuel County, GA, Fayette County, GA, Fulton County, GA, Glascock County, GA, Greene County, GA, Gwinnett County, GA, Hancock County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Houston County, GA, Jasper County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, Laurens County, GA, Lee County, GA, Lincoln County, GA, Macon County, GA, Madison County, GA, Marion County, GA, McDuffie County, GA, Meriwether County, GA, Monroe County, GA, Montgomery County, GA, Morgan County, GA, Muscogee County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Peach County, GA, Pike County, GA, Pulaski County, GA, Putnam County, GA, Quitman County, GA, Randolph County, GA, Richmond County, GA, Rockdale County, GA, Schley County, GA, Screven County, GA, Spalding County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taliaferro County, GA, Taylor County, GA, Terrell County, GA, Treutlen County, GA, Troup County, GA, Twiggs County, GA, Upson County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Webster County, GA, Wheeler County, GA, Wilcox County, GA, Wilkes County, GA, Wilkinson County, GA, Abbeville County, SC, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Calhoun County, SC, Chester County, SC, Colleton County, SC, Edgefield County, SC, Fairfield County, SC, Greenwood County, SC, Hampton County, SC, Laurens County, SC, Lexington County, SC, McCormick County, SC, Newberry County, SC, Orangeburg County, SC, Richland County, SC, Saluda County, SC
The radar
The Robins AFB radar (KJGX), 64 km from the middle of the area, began a volume at 19:57 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 12:00Z, 8.0 hours before the alert went out and 70 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.
- Mixed-layer CAPE
- 238 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 505 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 265 m²/s²
- 0-3 km storm-relative helicity
- 291 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.4
The text
As transmitted, in the capitals the NWS used until 2016.
242 ACUS11 KWNS 211958 SWOMCD SPC MCD 211957 SCZ000-GAZ000-ALZ000-212100- MESOSCALE DISCUSSION 0043 NWS STORM PREDICTION CENTER NORMAN OK 0157 PM CST SAT JAN 21 2012 AREAS AFFECTED...SERN AL...GA...SC CONCERNING...TORNADO WATCH 4... VALID 211957Z - 212100Z THE SEVERE WEATHER THREAT FOR TORNADO WATCH 4 CONTINUES. UPPER SHORTWAVE TROUGH IS PROGRESSING STEADILY EWD ACROSS THE TN VALLEY/GULF STATES AT ROUGHLY 45KT...CURRENTLY EXTENDING FROM A VORT MAX JUST E OF CHA...SWD THROUGH CNTRL GA. A LONGER LIVED COMPLEX OF STORMS THAT EVOLVED OVER CNTRL AL HAS PROPAGATED INTO ECNTRL GA...HANCOCK/WASHINGTON COUNTY...WHERE IT HAS MERGED WITH SEWD-MOVING FRONTAL CONVECTION. THIS LEADING...SOMEWHAT MORE ORGANIZED...COMPLEX IS APPROACHING THE ERN LIMITS OF MORE BUOYANT AIRMASS AS SFC DEW POINTS HAVE STRUGGLED TO RISE THROUGH THE UPPER 50S ACROSS SC. EVEN SO...PRE-FRONTAL BOUNDARY LAYER HAS HEATED ACROSS SRN GA/AL WHERE SFC-3KM LAPSE RATES ARE NOW ON THE ORDER OF 7 C/KM AND THIS MAY ENHANCE THE PROSPECT FOR HAIL/DAMAGING WINDS AS FRONTAL SQUALL LINE SAGS SEWD. IN THE WAKE OF AFOREMENTIONED SHORTWAVE TROUGH IT APPEARS LARGE SCALE SUBSIDENCE WILL GRADUALLY PROVE DETRIMENTAL TO TSTMS AS THEY TRAIL SWWD ALONG WIND SHIFT. ..DARROW.. 01/21/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...CHS...CAE...GSP...FFC...TAE...BMX... LAT...LON 33338615 34848105 32758031 31258544 33338615
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 20, 10:02 PM CST | Mesoscale Discussion | SPC | Colbert, Lauderdale, Limestone | 88 min |
| Jan 20, 10:35 PM CST | Tornado Watch | SPC | Colbert, Fayette, Franklin, Lamar, Lauderdale, Lawrence and 6 more | 8 hr |
| Jan 21, 1:52 AM CST | Mesoscale Discussion | SPC | Autauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 31 more | 113 min |
| Jan 21, 4:20 AM CST | Mesoscale Discussion | SPC | Autauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 35 more | 55 min |
| Jan 21, 4:55 AM CST | Tornado Watch | SPC | Autauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 37 more | 7 hr |
| Jan 21, 7:22 AM CST | Mesoscale Discussion | SPC | Autauga, Bibb, Blount, Bullock, Calhoun, Chambers and 32 more | 83 min |
| Jan 21, 10:01 AM CST | Mesoscale Discussion | SPC | Autauga, Barbour, Bibb, Bullock, Butler, Chambers and 25 more | 59 min |
| Jan 21, 11:28 AM CST | Tornado Watch | SPC | Barbour, Bullock, Chambers, Clay, Henry, Lee and 4 more | 8 hr |
| Jan 21, 4:48 PM CST | Mesoscale Discussion | SPC | Henry | 57 min |
Nearby
Mesoscale Discussions in Georgia, 2012Mesoscale Discussions in South Carolina, 2012Mesoscale Discussions in Alabama, 2012Every mesoscale discussion in 2012
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.