SPC MESOSCALE DISCUSSION 1892 FOR
CONCERNING...SEVERE THUNDERSTORM WATCH 698...

VALID 270042Z - 270200Z

00Z SOUNDING FROM MPX INDICATES AN IMPRESSIVE LOW LEVEL WARM
ADVECTION PROFILE WITH FAIRLY STEEP LOW-MID LEVEL LAPSE RATES. 
UPSTREAM SOUNDING AT ABR SUGGESTS WEAK CAPPING ABOVE THE BOUNDARY
LAYER WHICH MAY BE SUPPRESSING MORE VIGOROUS UPDRAFTS AHEAD OF
UPPER TROUGH.  SINCE 00Z A NEW THUNDERSTORM HAS DEVELOPED WNW RWF. 
OTHER SCATTERED SHOWERS ARE DEVELOPING NORTHEAST OF WW AROUND BRD. 
IT APPEARS ELEVATED THUNDERSTORMS WILL EVENTUALLY ORGANIZE WITH
SHEAR PROFILES STRONGLY IN FAVOR OF ROTATION AND ISOLATED
SUPERCELLS.


..DARROW.. 08/27/01