Mesoscale Discussion 307

Issued

Mar 20, 2012, 2:26 PM CDT (19:26 UTC)

Expired

Mar 20, 2012, 4:00 PM CDT

In force

94 min

Issued by

the Storm Prediction Center

Counties Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Cameron Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Union Parish, LA, Vernon Parish, LA, Winn Parish, LA

430 
ACUS11 KWNS 201927
SWOMCD
SPC MCD 201926
LAZ000-TXZ000-202100-

MESOSCALE DISCUSSION 0307
NWS STORM PREDICTION CENTER NORMAN OK
0226 PM CDT TUE MAR 20 2012

AREAS AFFECTED...MUCH OF NORTHERN/SOUTHWEST LA

CONCERNING...TORNADO WATCH 92...

VALID 201926Z - 202100Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 92 CONTINUES.

TORNADO WATCH 92 REMAIN IN EFFECT ACROSS MUCH OF
NORTHERN/WEST-CENTRAL/SOUTHWEST LA...WITH POTENTIAL FOR BOUTS OF
DAMAGING WINDS ALONG WITH A FEW TORNADOES AND LOCALLY
HEAVY/REPETITIVE RAINFALL.

A NNE-SSW ANGLING COMPOSITE OUTFLOW BOUNDARY CONTINUES TO SERVE AS A
FOCUS FOR PERSISTENT QUASI-LINEAR CONVECTION ACROSS LA AT MID
AFTERNOON...AND THIS TREND SHOULD CONTINUE AS IT MAKES A SLOW
EASTWARD-PROGRESSION INTO A RELATIVELY MOIST/WARM BOUNDARY LAYER IN
THE PRESENCE OF STRONG/DEEP SOUTHERLY FLOW. OWING TO BACKING
MID-LEVEL FLOW AND A LESS EXTENSIVE COLD POOL /RELATIVE TO FARTHER
NORTH/...THE PORTION OF THE QLCS ACROSS SOUTHWEST LA HAS APPEARED TO
HAVE SLOWED SOMEWHAT/REMAIN TEMPERED IN ITS EASTWARD PROGRESSION. A
MORE BALANCED COLD POOL/SHEAR INTERACTION COULD YET ALLOW FOR A BIT
OF AN UPSWING IN POSSIBLE LINE-EMBEDDED MESOVORTICES/SUPERCELLS
ACROSS SOUTHWEST LA...WITH THE LATEST WSR-88D VWP DATA FROM LAKE
CHARLES /MODIFIED FOR IMMEDIATE PRE-QLCS CONDITIONS/ INDICATIVE OF
0-1 KM SRH IN EXCESS OF 300 M2/S2. WIND DAMAGE/ISOLATED TORNADO
POTENTIAL WILL OTHERWISE PERSIST ACROSS CENTRAL/NORTHERN LA THIS
AFTERNOON IN ASSOCIATION WITH THE ADVANCING QLCS ITSELF...AND
PERHAPS A FEW IMMEDIATE PRE-QLCS STORMS/SUPERCELLS.

..GUYER.. 03/20/2012

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

ATTN...WFO...JAN...LCH...SHV...

LAT...LON   32879281 32939198 31589204 29429291 29499395 30889354
            31599290 32879281

Mesoscale Discussions in Louisiana, 2012Every mesoscale discussion in 2012

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.