MESOSCALE DISCUSSION 1437
   NWS STORM PREDICTION CENTER NORMAN OK
   0802 PM CDT SAT JUL 04 2009
   
   AREAS AFFECTED...PARTS OF SRN KY AND NRN MIDDLE TN
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 549...
   
   VALID 050102Z - 050130Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 549
   CONTINUES.
   
   NEW WW DOES NOT APPEAR TO BE WARRANTED DOWNSTREAM OF WW 549... GIVEN
   A MARGINALLY UNSTABLE ENVIRONMENT. 
   
   RECENT RADAR IMAGERY INDICATED A WEAKENING BOW ECHO MOVING EWD ALONG
   THE KY/TN BORDER.  THIS RECENT TREND IN RADAR DATA MAY BE INDICATIVE
   OF THIS TSTM COMPLEX BEGINNING TO OUTRUN THE NERN EXTENT OF STRONGER
   INSTABILITY.  ALTHOUGH EFFECTIVE BULK SHEAR /40-50 KT/ REMAINS
   SUPPORTIVE OF ORGANIZED STORMS...WEAKER INSTABILITY WITH EWD EXTENT
   SHOULD LIMIT THE OVERALL SEVERE WEATHER THREAT AS TSTMS PROGRESS EWD
   OF WW 549 BY 0130Z.
   
   FARTHER W...TSTMS OVER WRN TN WERE LOCATED WITHIN A MODERATELY
   UNSTABLE AIR MASS WITH EFFECTIVE SHEAR AROUND 40 KT.  THIS SUGGESTS
   ANY ADDITIONAL STORMS MOVING EWD FROM WRN INTO MIDDLE TN WILL HAVE A
   THREAT TO PRODUCE SEVERE WEATHER...MAINLY STRONG WIND GUSTS AND
   HAIL.  IF WRN TN STORMS REMAIN STRONG...THEN ADDITIONAL MIDDLE TN
   COUNTIES MAY NEED TO BE ADDED TO WW 549.
   
   ..PETERS.. 07/05/2009
   
   
   ATTN...WFO...MRX...JKL...LMK...OHX...HUN...PAH...MEG...
   
   LAT...LON   35358967 36028919 36628802 37078700 36938543 36858485
               36358472 35898470 35328512 35098569 35178696 35238830
               35358967