Alert archive / Georgia / Mesoscale Discussions in 2012

Mesoscale Discussion 44

January 21, 2012Henry County, Alabama; 44 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Jan 21, 2012, 4:48 PM CST for Henry County, Alabama; 44 counties in Georgia. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
Jan 21, 2012, 4:48 PM CST (22:48 UTC)
Expired
Jan 21, 2012, 5:45 PM CST
In force
57 min
Issued by
the Storm Prediction Center
All 45 counties

Henry County, AL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brantley County, GA, Bryan County, GA, Calhoun County, GA, Clay County, GA, Clinch County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Crisp County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Effingham County, GA, Evans County, GA, Grady County, GA, Irwin County, GA, Jeff Davis County, GA, Lanier County, GA, Lee County, GA, Liberty County, GA, Long County, GA, Miller County, GA, Mitchell County, GA, Montgomery County, GA, Pierce County, GA, Randolph County, GA, Tattnall County, GA, Telfair County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Toombs County, GA, Turner County, GA, Ware County, GA, Wayne County, GA, Wheeler County, GA, Wilcox County, GA, Worth County, GA

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 10.8 hours before the alert went out and 154 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 2012-01-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2012-01-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 173 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1043 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
173 m²/s²
0-3 km storm-relative helicity
220 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.

249 
ACUS11 KWNS 212249
SWOMCD
SPC MCD 212248
SCZ000-GAZ000-ALZ000-212345-

MESOSCALE DISCUSSION 0044
NWS STORM PREDICTION CENTER NORMAN OK
0448 PM CST SAT JAN 21 2012

AREAS AFFECTED...SRN GA

CONCERNING...TORNADO WATCH 4...

VALID 212248Z - 212345Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 4 CONTINUES.

ISOLATED DAMAGING WIND/BRIEF TORNADO AND MARGINAL HAIL THREATS
SHOULD PERSIST FOR THE NEXT COUPLE OF HOURS...BUT WILL LIKELY WANE
IN BOTH INTENSITY AND SPATIAL EXTENT ESPECIALLY AFTER 00-01Z. A
DOWNSTREAM WW IS NOT ANTICIPATED ATTM.

AS OF 2235Z...MOST INTENSE PART OF LONG-LIVED QLCS EXTENDED IN A
NEARLY W/E-ORIENTATION FROM RANDOLPH TO TELFAIR COUNTIES...WITH
BROADENING/WEAKENING OF HIGHER REFLECTIVITY CORES NOTED FARTHER E
TOWARDS FAR SRN SC. 0-1 KM SRH AROUND 150-250 M2/S2 HAS BEEN
SUPPORTIVE OF EMBEDDED MESOCYCLONES WHICH WILL REMAIN CAPABLE OF
PRODUCING ISOLATED DAMAGING WINDS AND PERHAPS A BRIEF TORNADO. WITH
SHORT WAVE IMPULSE NOW CROSSING WRN NC/SC...UPSTREAM RIDGING WILL
LEAD TO DIMINISHING LOW-LEVEL KINEMATIC FIELDS AND MID-LEVEL
SUBSIDENCE/WARMING...RESULTING IN AN OVERALL WEAKENING TREND TO THE
QLCS. IN ADDITION...SOMEWHAT DRIER DOWNSTREAM SURFACE DEW POINTS
/GENERALLY IN THE MIDDLE TO UPPER 50S/ ALONG WITH ONSET OF NOCTURNAL
COOLING SHOULD PROVE DETRIMENTAL TO INTENSIFICATION OF THE QLCS THIS
EVENING.

..GRAMS.. 01/21/2012

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

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

LAT...LON   31798513 32048366 32328193 32558120 32088111 31548144
            31238184 30908257 30828348 30888468 31098509 31378538
            31588540 31798513

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 20, 10:02 PM CSTMesoscale DiscussionSPCColbert, Lauderdale, Limestone88 min
Jan 20, 10:35 PM CSTTornado WatchSPCColbert, Fayette, Franklin, Lamar, Lauderdale, Lawrence and 6 more8 hr
Jan 21, 1:52 AM CSTMesoscale DiscussionSPCAutauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 31 more113 min
Jan 21, 4:20 AM CSTMesoscale DiscussionSPCAutauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 35 more55 min
Jan 21, 4:55 AM CSTTornado WatchSPCAutauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 37 more7 hr
Jan 21, 7:22 AM CSTMesoscale DiscussionSPCAutauga, Bibb, Blount, Bullock, Calhoun, Chambers and 32 more83 min
Jan 21, 10:01 AM CSTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Bullock, Butler, Chambers and 25 more59 min
Jan 21, 11:28 AM CSTTornado WatchSPCBarbour, Bullock, Chambers, Clay, Henry, Lee and 4 more8 hr
Jan 21, 1:57 PM CSTMesoscale DiscussionSPCBarbour, Bullock, Chambers, Clay, Henry, Lee and 4 more63 min

Nearby

Mesoscale Discussions in Georgia, 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.