MESOSCALE DISCUSSION 1857
   NWS STORM PREDICTION CENTER NORMAN OK
   0756 PM CDT SAT SEP 01 2012
   
   AREAS AFFECTED...WRN TN THROUGH EXTREME SERN MO...WRN KY AND SRN IND
   
   CONCERNING...TORNADO WATCH 603...605...
   
   VALID 020056Z - 020230Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 603...605...CONTINUES.
   
   SUMMARY...THREAT FOR ISOLATED TORNADOES EXPECTED TO PERSIST MAINLY
   FROM WRN TN...WRN KY AND SRN IND NEXT COUPLE HOURS. WW ISSUANCE EAST
   OF 605 INTO MIDDLE TN MAY NOT BE NECESSARY UNLESS CONVECTIVE TRENDS
   DICTATE OTHERWISE.
   
   DISCUSSION...LINE OF STORMS WITH A FEW EMBEDDED SUPERCELLS CONTINUES
   MOVING EWD THROUGH WRN TN...WRN KY AND SRN IL. LATEST VWP FROM
   PADUCAH SHOWS LLJ HAS INCREASED TO 50 KT NEAR 1 KM...LIKELY IN
   ASSOCIATION WITH VORT MAX ROTATING AROUND SRN PERIPHERY OF UPPER LOW
   CIRCULATION. THIS HAS RESULTED IN AN INCREASE IN HODOGRAPH SIZE.
   WITH A VERY MOIST BOUNDARY LAYER IN PLACE...INSTABILITY WILL LIKELY
   REMAIN SUFFICIENT FOR STRONG TO SEVERE STORMS TO PERSIST NEXT 2-3
   HOURS GIVEN THE FAVORABLE LOW LEVEL HODOGRAPHS. HOWEVER...A SLOW
   DECREASE IN INTENSITIES MAY COMMENCE AS THE EVENING
   PROGRESSES...ESPECIALLY SOUTH OF THE KY BORDER. SEVERE THREAT IN KY
   MIGHT BE A LITTLE MORE PERSISTENT DUE TO PRESENCE OF STRONGER
   FORCING AND LOW LEVEL SHEAR.
   
   ..DIAL.. 09/02/2012
   
   
   ATTN...WFO...OHX...PAH...MEG...
   
   LAT...LON   36028916 37208873 38288831 38388715 37578713 35938823
               36028916