MESOSCALE DISCUSSION 0426
   NWS STORM PREDICTION CENTER NORMAN OK
   0225 PM CDT TUE APR 03 2007
   
   AREAS AFFECTED...SRN/SERN MO...SRN IL...WRN KY AND SWRN IND
   
   CONCERNING...TORNADO WATCH 111...
   
   VALID 031925Z - 032030Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 111 CONTINUES.
   
   THREAT FOR TORNADOES INCREASING ACROSS WW 111...AND ESPECIALLY FOR
   THE SRN/SERN MO INTO SRN IL PART OF THIS WW FOR THE NEXT FEW HOURS.
   
   REGIONAL RADARS AND VISIBLE SATELLITE IMAGERY INDICATED EXPLOSIVE
   TSTM DEVELOPMENT ALONG A PRE-FRONTAL CONVERGENCE BOUNDARY WHICH
   EXTENDED FROM NEAR STL SWWD TO THE VICINITY OF UNO.  THIS
   DEVELOPMENT IS INDICATIVE OF AN ERODING CAP...WITH ADDITIONAL
   DEVELOPMENT LIKELY AS THE COLD FRONT ADVANCES EWD.  A VERY UNSTABLE
   AIR MASS ACROSS SOUTH CENTRAL/SERN MO...WITH OBJECTIVE ANALYSES
   INDICATING INCREASING DEEP LAYER /0-6 KM OF 40 KT/ AND LOW LEVEL
   SHEAR VALUES /0-1 KM SRH VALUES OF 150-250 M2/S2/ ARE SUPPORTIVE OF
   TORNADIC SUPERCELLS.
   
   ..PETERS.. 04/03/2007
   
   
   ATTN...WFO...LMK...OHX...IND...PAH...ILX...MEG...LSX...SGF...
   
   36729446 37929246 38779153 39098754 38558743 38508711
   36628709 36559036 36549454