000
ACUS11 KWNS 210107
SWOMCD
SPC MCD 210107
MOZ000-ILZ000-ARZ000-210130-

MESOSCALE DISCUSSION 0737
NWS STORM PREDICTION CENTER NORMAN OK
0807 PM CDT MON MAY 20 2013

AREAS AFFECTED...FAR W-CNTRL IL / CNTRL-SWRN MO

CONCERNING...TORNADO WATCH 190...193...

VALID 210107Z - 210130Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 190...193...CONTINUES.

SUMMARY...DAMAGING WINDS ARE BECOMING THE PREDOMINATE THREAT AS
STORMS CONTINUE TO GROW UPSCALE INTO A QLCS.  A TORNADO REMAINS
POSSIBLE WITH ANY STRONGER/LONGER-LIVED EMBEDDED MESOCYCLONE OR
MESOVORTEX.

DISCUSSION...RADAR MOSAIC SHOWS STORMS CONGEALING INTO A QLCS DURING
THE PAST HOUR AS CONVECTIVE MERGERS AND DIFFERENTIAL STORM MOTIONS
ACT TO FAVOR UPSCALE GROWTH.  THE 00Z/20 SGF RAOB EXHIBITED A VERY
MOIST BOUNDARY LAYER CONTRIBUTING TO MODERATE INSTABILITY /2400 J/KG
MLCAPE/ AND AN INCREASING/VEERING WIND PROFILE WITH HEIGHT.  STORMS
THAT CAN ORIENT PERPENDICULAR TO THE FLOW IN THE LOWEST 0-3 KM WILL
POSE AN ENHANCED THREAT FOR WIND DAMAGE.

..SMITH.. 05/21/2013

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

ATTN...WFO...ILX...LSX...LZK...SGF...

LAT...LON   37439314 39959133 39779059 39399040 36979226 36479308
            36669367 37439314