Alert archive / Georgia / Mesoscale Discussions in 2012

Mesoscale Discussion 79

January 26, 20129 counties in Florida; 20 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Jan 26, 2012, 9:38 PM EST for 9 counties in Florida; 20 counties in Georgia. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
Jan 26, 2012, 9:38 PM EST (02:38 UTC)
Expired
Jan 26, 2012, 10:45 PM EST
In force
67 min
Issued by
the Storm Prediction Center
All 29 counties

Baker County, FL, Columbia County, FL, Dixie County, FL, Gilchrist County, FL, Hamilton County, FL, Lafayette County, FL, Madison County, FL, Suwannee County, FL, Taylor County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Ben Hill County, GA, Berrien County, GA, Brantley County, GA, Brooks County, GA, Charlton County, GA, Clinch County, GA, Coffee County, GA, Cook County, GA, Echols County, GA, Irwin County, GA, Jeff Davis County, GA, Lanier County, GA, Lowndes County, GA, Pierce County, GA, Telfair County, GA, Ware County, GA, Wheeler County, GA

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 2.6 hours before the alert went out and 118 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 00:00Z on 2012-01-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 376 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 00:00Z on 2012-01-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 257 square meters per square second.1939587897Sfc1 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
376 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
504 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
257 m²/s²
0-3 km storm-relative helicity
252 m²/s²
Significant tornado parameter
0.5
Supercell composite
3.1

Open this sounding in Storm Lab

The text

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

607 
ACUS11 KWNS 270239
SWOMCD
SPC MCD 270238
GAZ000-FLZ000-270345-

MESOSCALE DISCUSSION 0079
NWS STORM PREDICTION CENTER NORMAN OK
0838 PM CST THU JAN 26 2012

AREAS AFFECTED...SOUTHEAST GA/NORTH FL

CONCERNING...TORNADO WATCH 19...

VALID 270238Z - 270345Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 19 CONTINUES.

TORNADO WATCH 19 WILL LIKELY BE ALLOWED TO EXPIRE AS SCHEDULED AT
03Z...WITH ANY LINGERING TORNADO/DAMAGING WIND THREAT EXPECTED TO
REMAIN LOCALIZED WITHIN/NEAR WW 19.

INTEGRITY OF THE SQUALL LINE CROSSING SOUTH-CENTRAL GA/NORTH FL HAS
CONTINUED TO WANE OVER THE PAST FEW HOURS...WITH A GENERAL ABSENCE
OF CG LIGHTNING AND A CONTINUED TREND OF WARMING CLOUD TOPS OVER
INLAND AREAS PER IR SATELLITE IMAGERY. THESE FACTORS INDICATE THAT
ANY LINGERING SEVERE THREAT IN/NEAR TORNADO WATCH 19 WILL REMAIN
MARGINAL/LOCALIZED...SUCH THAT NO ADDITIONAL WATCHES ARE CURRENTLY
ANTICIPATED FOR SOUTHEAST GA/NORTHEAST FL THIS EVENING.

..GUYER.. 01/27/2012

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

ATTN...WFO...TBW...JAX...FFC...TAE...

LAT...LON   29628398 31208352 32168317 32178239 30948187 29388295
            29628398

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 26, 7:29 PM ESTMesoscale DiscussionSPCColumbia, Dixie, Hamilton, Jefferson, Lafayette, Leon and 4 more91 min

Nearby

Mesoscale Discussions in Georgia, 2012Mesoscale Discussions in Florida, 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.