Alert archive / Georgia / Mesoscale Discussions in 2014

Mesoscale Discussion 21

January 11, 2014Henry County, Houston County, Alabama; 12 counties in Florida; 29 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Jan 11, 2014, 12:53 PM CST for Henry County, Houston County, Alabama; 12 counties in Florida; 29 counties in Georgia. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
Jan 11, 2014, 12:53 PM CST (18:53 UTC)
Expired
Jan 11, 2014, 2:30 PM CST
In force
97 min
Issued by
the Storm Prediction Center
All 43 counties

Henry County, AL, Houston County, AL, Bay County, FL, Calhoun County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Wakulla County, FL, Washington County, FL, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brooks County, GA, Calhoun County, GA, Clay County, GA, Colquitt County, GA, Cook County, GA, Crisp County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Irwin County, GA, Lee County, GA, Miller County, GA, Mitchell County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Sumter County, GA, Telfair County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Webster County, GA, Wilcox County, GA, Worth County, GA

The radar

The Tallahassee radar (KTLH), 68 km from the middle of the area, began a volume at 18:54 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 6.9 hours before the alert went out and 68 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, Tallahassee Rgnl, FL at 12:00Z on 2014-01-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 15 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, Tallahassee Rgnl, FL at 12:00Z on 2014-01-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 195 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
15 J/kg
Mixed-layer CIN
-123 J/kg
Mixed-layer LCL
578 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
195 m²/s²
0-3 km storm-relative helicity
206 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

Open this sounding in Storm Lab

The text

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

586 
ACUS11 KWNS 111853
SWOMCD
SPC MCD 111853 
GAZ000-FLZ000-ALZ000-112030-

MESOSCALE DISCUSSION 0021
NWS STORM PREDICTION CENTER NORMAN OK
1253 PM CST SAT JAN 11 2014

AREAS AFFECTED...GA,,,FL

CONCERNING...SEVERE THUNDERSTORM WATCH 3...

VALID 111853Z - 112030Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 3 CONTINUES.

SUMMARY...INTENSE/SEVERE TSTMS WERE MOVING INTO ERN PORTIONS OF SVR
TSTM WATCH 3 AND WILL LIKELY BE OUT OF MOST OF THE WATCH AREA IN THE
NEXT 1-2H. LOCALLY DAMAGING WIND GUSTS MAY ACCOMPANY THE STRONGER
CORES/LINE SEGMENTS.

DISCUSSION...LATEST INDICATIONS BASED ON LIGHTNING AND CAPPI SHOW
STRONGEST CONVECTION IN WATCH 3 IS CONFINED TO THE FL BIG BEND
REGION WITH A LEADING CELL RECENTLY MOVING ACROSS TAYLOR COUNTY AND
MORE LINEAR STRUCTURE EVIDENT FARTHER WEST...FROM LEON TO FRANKLIN
COUNTY. THIS ACTIVITY WILL CONTINUE TO POSE A THREAT OF STRONG TO
DAMAGING WINDS GIVEN ITS JUXTAPOSITION WITH A VERY MOIST TROPICAL
AIRMASS AND STOUT MID-LEVEL FLOW ON THE ORDER OF 60KT.

..CARBIN.. 01/11/2014

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

ATTN...WFO...JAX...FFC...TAE...BMX...

LAT...LON   32068394 32068266 30858333 29638401 29648526 29638651
            30858586 32068522 32068394

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 10, 11:41 PM CSTMesoscale DiscussionSPCChoctaw, Washington2 hr
Jan 11, 3:18 AM CSTMesoscale DiscussionSPCAutauga, Baldwin, Butler, Choctaw, Clarke, Conecuh and 13 more117 min
Jan 11, 7:03 AM CSTMesoscale DiscussionSPCBarbour, Bullock, Butler, Chambers, Coffee, Conecuh and 12 more27 min
Jan 11, 7:07 AM CSTTornado WatchSPCBarbour, Bullock, Chambers, Lee, Macon, Montgomery and 2 more7 hr
Jan 11, 10:04 AM CSTSevere Thunderstorm WatchSPCDale, Geneva, Henry, Houston6 hr
Jan 11, 2:35 PM CSTMesoscale DiscussionSPCAlachua, Baker, Bradford, Clay, Columbia, Duval and 3 more55 min
Jan 11, 8:22 AM CSTMesoscale DiscussionSPCHart23 min
Jan 11, 8:30 AM CSTSevere Thunderstorm WatchSPCColumbia, Elbert, Lincoln, McDuffie6 hr
Jan 11, 10:50 AM CSTTornado WatchSPCBurke, Richmond6 hr
Jan 11, 11:17 AM CSTMesoscale DiscussionSPCAppling, Bacon, Baldwin, Ben Hill, Bleckley, Bryan and 32 more58 min
Jan 11, 12:51 PM CSTTornado WatchSPCAppling, Atkinson, Bacon, Brantley, Bryan, Bulloch and 20 more3 hr
Jan 11, 1:04 PM CSTMesoscale DiscussionSPCRichmond56 min

Nearby

Mesoscale Discussions in Georgia, 2014Mesoscale Discussions in Florida, 2014Mesoscale Discussions in Alabama, 2014Every mesoscale discussion in 2014

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.