Alert archive / Mississippi / Mesoscale Discussions in 2012

Mesoscale Discussion 224

March 2, 20125 states

The Storm Prediction Center issued this mesoscale discussion at Mar 2, 2012, 7:18 PM CST for 5 states. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
Mar 2, 2012, 7:18 PM CST (01:18 UTC)
Expired
Mar 2, 2012, 8:15 PM CST
In force
57 min
Issued by
the Storm Prediction Center
All 75 counties

Blount County, AL, Cullman County, AL, DeKalb County, AL, Fayette County, AL, Greene County, AL, Jackson County, AL, Lamar County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Dade County, GA, Catahoula Parish, LA, Concordia Parish, LA, Franklin Parish, LA, Grant Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Tensas Parish, LA, Adams County, MS, Attala County, MS, Choctaw County, MS, Claiborne County, MS, Clarke County, MS, Clay County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Hinds County, MS, Holmes County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Lowndes County, MS, Madison County, MS, Marion County, MS, Monroe County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Warren County, MS, Winston County, MS, Yazoo County, MS, Bledsoe County, TN, Coffee County, TN, Cumberland County, TN, Franklin County, TN, Grundy County, TN, Hamilton County, TN, Lincoln County, TN, Marion County, TN, Moore County, TN, Rhea County, TN, Sequatchie County, TN, Van Buren County, TN, Warren County, TN, White County, TN

The radar

The Columbus AFB radar (KGWX), 55 km from the middle of the area, began a volume at 01:21 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 1.3 hours before the alert went out and 112 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, Birmingham, AL at 00:00Z on 2012-03-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 754 joules per kilogram.LCLEL10008507005003002001001 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, Birmingham, AL at 00:00Z on 2012-03-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 231 square meters per square second.1939587897117136Sfc1 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
754 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
1391 m above ground
0-6 km bulk shear
67 kt
0-1 km storm-relative helicity
231 m²/s²
0-3 km storm-relative helicity
315 m²/s²
Significant tornado parameter
0.9
Supercell composite
7.4

Open this sounding in Storm Lab

The text

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

345 
ACUS11 KWNS 030119
SWOMCD
SPC MCD 030118
TNZ000-GAZ000-ALZ000-MSZ000-LAZ000-030215-

MESOSCALE DISCUSSION 0224
NWS STORM PREDICTION CENTER NORMAN OK
0718 PM CST FRI MAR 02 2012

AREAS AFFECTED...MIDDLE TN / NRN AL / CNTRL MS / NERN LA

CONCERNING...TORNADO WATCH 59...60...64...

VALID 030118Z - 030215Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH
59...60...64...CONTINUES.

ISOLD TORNADO POTENTIAL WILL LIKELY REMAIN HIGHEST OVER SRN MIDDLE
TN AND OVER NRN AL THE NEXT FEW HOURS COMPARED TO LOCATIONS FARTHER
SW OVER CNTRL MS AND NERN LA.

RADAR MOSAIC SHOWS SCATTERED SEMI-DISCRETE STORMS /SOME
SUPERCELLULAR/ OVER E-CNTRL MS NEWD INTO NRN AL.  THIS ACTIVITY IS
AHEAD OF AN APPROACHING DRYLINE THAT WILL SOON BE OVERTAKEN BY A
COLD FRONT MOVING SLOWLY SEWD ACROSS THE AREA.  THE JAN 00Z RAOB
FEATURED A WELL-MIXED BOUNDARY LAYER WITH RELATIVELY MODEST LCL/S
AND LOW LEVEL SHEAR /EFFECTIVE SRH AROUND 100 M2/S2/.  ALTHOUGH
SURFACE SPREADS WILL CONTINUE TO LOWER --OWING TO DIURNAL COOLING--
THE LLJ WILL LARGELY BE FOCUSED E OVER AL NEWD INTO THE SRN
APPALACHIANS.  THIS WILL TEND TO LIMIT /NOT NEGATE/ TORNADO
POTENTIAL OVER CNTRL MS...WITH THE PRIMARY SEVERE HAZARDS OVER THE
NERN LA/SWRN MS RELEGATED TO ISOLD DMGG WINDS/LARGE HAIL.

FARTHER NE OVER NRN AL AND SRN MIDDLE TN...CLUSTERS OF STORMS /SOME
SUPERCELLS/ ARE SITUATED IN A MORE FAVORABLE LOW LEVEL SHEAR
ENVIRONMENT.  THIS IS MOST APPARENT IN BMX 00Z RAOB --WITH
STRENGTHENING LOW LEVEL SHEAR OVER THE PAST HOUR AT KBMX AND KHTX
VAD/S SHOWING /300-500 0-1 KM SRH/.  GIVEN A SUFFICIENTLY
MOIST/UNSTABLE AIRMASS...AN ISOLD TORNADO RISK /FEATURING POSSIBLE
STRONG TORNADOES/ WILL CONTINUE...ALONG WITH DMGG WINDS AND LARGE
HAIL.

..SMITH.. 03/03/2012

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

ATTN...WFO...MRX...FFC...OHX...BMX...HUN...MOB...MEG...JAN...
LIX...LCH...SHV...

LAT...LON   33478705 31588885 31218982 31229270 31819249 34508763
            35988558 36298485 35368486 34188607 33478705

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 2, 10:07 PM CSTMesoscale DiscussionSPCAutauga, Bibb, Calhoun, Chambers, Cherokee, Chilton and 25 more113 min
Mar 2, 10:56 PM CSTTornado WatchSPCAutauga, Baldwin, Barbour, Bibb, Bullock, Butler and 31 more6 hr
Mar 3, 4:47 AM CSTMesoscale DiscussionSPCCoffee, Covington, Dale, Geneva, Henry, Houston58 min
Mar 3, 6:35 AM CSTTornado WatchSPCGeneva, Houston6 hr
Mar 2, 7:15 PM CSTMesoscale DiscussionSPCCatoosa, Dade, Fannin, Gilmer, Murray, Rabun and 4 more90 min
Mar 2, 8:36 PM CSTMesoscale DiscussionSPCBaker, Calhoun, Colquitt, Cook, Decatur, Dougherty and 6 more54 min
Mar 2, 9:54 PM CSTTornado WatchSPCBanks, Barrow, Bartow, Butts, Carroll, Catoosa and 61 more6 hr
Mar 2, 11:40 PM CSTMesoscale DiscussionSPCBanks, Barrow, Bartow, Carroll, Cherokee, Clarke and 30 more95 min
Mar 3, 2:58 AM CSTMesoscale DiscussionSPCBurke, Columbia, Glascock, Jefferson, Jenkins, Lincoln and 6 more92 min
Mar 3, 3:39 AM CSTSevere Thunderstorm WatchSPCBurke, Columbia, Lincoln, McDuffie, Richmond4 hr
Mar 3, 9:12 AM CSTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Berrien, Brantley, Brooks and 24 more93 min
Mar 3, 11:45 AM CSTMesoscale DiscussionSPCBrantley, Brooks, Camden, Charlton, Clinch, Echols and 3 more60 min
Mar 3, 12:04 PM CSTTornado WatchSPCAtkinson, Brantley, Brooks, Camden, Charlton, Clinch and 12 more5 hr
Mar 3, 3:30 PM CSTMesoscale DiscussionSPCCharlton90 min

Nearby

Mesoscale Discussions in Mississippi, 2012Mesoscale Discussions in Alabama, 2012Mesoscale Discussions in Tennessee, 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.