Alert archive / Alabama / Mesoscale Discussions in 2012

Mesoscale Discussion 333

March 23, 20128 counties in Alabama; Holmes County, Florida; Quitman County, Georgia

The Storm Prediction Center issued this mesoscale discussion at Mar 23, 2012, 10:19 AM CDT for 8 counties in Alabama; Holmes County, Florida; Quitman County, Georgia. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued
Mar 23, 2012, 10:19 AM CDT (15:19 UTC)
Expired
Mar 23, 2012, 11:15 AM CDT
In force
56 min
Issued by
the Storm Prediction Center

Counties Barbour County, AL, Bullock County, AL, Coffee County, AL, Dale County, AL, Geneva County, AL, Henry County, AL, Pike County, AL, Russell County, AL, Holmes County, FL, Quitman County, GA

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 3.3 hours before the alert went out and 186 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 2012-03-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 758 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 2012-03-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 86 square meters per square second.1939Sfc1 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
758 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
800 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
86 m²/s²
0-3 km storm-relative helicity
108 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.1

Open this sounding in Storm Lab

The text

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

866 
ACUS11 KWNS 231520
SWOMCD
SPC MCD 231519
GAZ000-ALZ000-FLZ000-231615-

MESOSCALE DISCUSSION 0333
NWS STORM PREDICTION CENTER NORMAN OK
1019 AM CDT FRI MAR 23 2012

AREAS AFFECTED...SERN AL

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY

VALID 231519Z - 231615Z

TORNADO THREAT SHOULD REMAIN SPATIOTEMPORALLY CONFINED TO THE NEXT
HOUR OR SO IN SERN AL. A WW ISSUANCE IS NOT ANTICIPATED ATTM.

SMALL TSTM CLUSTER WITH A HISTORY OF PRODUCING A TORNADO NEAR TOI
HAS SHOWN PERSISTENT LOW-LEVEL ROTATION DURING THE PAST HOUR.
LOW-LEVEL FLOW IS MODERATE /0-1 KM SHEAR AROUND 15-20 KT/ IN THE
EOX/MXX VWP DATA...BUT SUFFICIENT FOR MAINTAINING MESOCYCLONES
WITHIN THE PRESENCE OF A NEARLY SATURATED THERMODYNAMIC PROFILE
CHARACTERIZED BY 66-68 DEG F SURFACE DEW POINTS. GIVEN THE PRESENCE
OF ABUNDANT LEADING STRATIFORM PRECIPITATION MITIGATING DOWNSTREAM
DESTABILIZATION AMIDST A MARGINALLY FAVORABLE WIND PROFILE...THE
TORNADO THREAT DOES NOT APPEAR LIKELY TO BE SUSTAINED BEYOND THE
NEXT HOUR OR SO.

..GRAMS.. 03/23/2012

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

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

LAT...LON   32238567 32348545 32378500 31948488 31468508 30888561
            30688598 30768641 30998652 31578621 32238567

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 23, 4:03 PM CDTMesoscale DiscussionSPCAutauga, Calhoun, Chambers, Cherokee, Chilton, Clay and 10 more87 min

Nearby

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