SWOMCD
SPC MCD 280209
LAZ000-TXZ000-280245-
MESOSCALE DISCUSSION 0613
NWS STORM PREDICTION CENTER NORMAN OK
0909 PM CDT MON APR 27 2009
AREAS AFFECTED...PORTIONS SWRN/S-CENTRAL LA
CONCERNING...SEVERE POTENTIAL...WATCH NEEDED SOON
VALID 280209Z - 280245Z
NRN PORTION QUASI-LINEAR MCS HAS INTENSIFIED OVER EXTREME SE
TX...AND SHOULD CONTINUE TO MOVE EWD OVER PORTIONS SWRN/S-CENTRAL LA
THROUGH 05Z. WHILE INSTABILITY SHOULD DIMINISH IN FOREGOING AIR
MASS WITH TIME...MODIFIED 00Z LCH RAOB INDICATES EFFECTIVE INFLOW
PARCELS WILL REMAIN SFC-BASED FOR A FEW MORE HOURS. SELY BOUNDARY
LAYER WINDS WILL HELP TO MAINTAIN STORM-RELATIVE INFLOW...WHILE
LIFTING ON LEADING EDGE OF COLD POOL HELPS TO MAINTAIN ASCENT OF
VERY MOIST SLAB OF INFLOW AIR SUPPORTING MLCAPE AROUND 500-800 J/KG.
LEWP/QLCS CIRCULATIONS MAY YIELD BRIEF/MRGL TORNADO
THREAT...HOWEVER GREATER SVR MODE SHOULD BE DAMAGING GUSTS.
..EDWARDS.. 04/28/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LCH...SHV...
LAT...LON 29689388 30719359 31299363 31379270 31089194 30169166
29539153 29589170 29459182 29579203 29599218 29539227
29569266 29769320 29689388
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