MESOSCALE DISCUSSION 0520
   NWS STORM PREDICTION CENTER NORMAN OK
   0848 AM CDT THU APR 18 2013
   
   AREAS AFFECTED...PORTIONS LOWER MI.
   
   CONCERNING...SEVERE POTENTIAL...WATCH NEEDED SOON 
   
   VALID 181348Z - 181415Z
   
   PROBABILITY OF WATCH ISSUANCE...95 PERCENT
   
   SUMMARY...WW ANTICIPATED FOR PORTIONS SRN/ERN LOWER MI.
   
   DISCUSSION...THOUGH CURRENTLY STABLE...WARM FRONTAL
   PASSAGE...WAA...MOIST ADVECTION AND SFC DIABATIC HEATING ARE
   EXPECTED TO CONTRIBUTE TO FAVORABLE DESTABILIZATION ACROSS THIS AREA
   PRIOR TO ARRIVAL OF MAIN CONVECTIVE BAND NOW OVER SRN LM. 
   DEEP-LAYER WIND FIELDS SUGGEST DAMAGING WIND AS MAIN THREAT...AND
   QLCS/BOW-ECHO TORNADOES CANNOT BE RULED OUT.
   
   ..EDWARDS/KERR.. 04/18/2013
   
   
   ATTN...WFO...DTX...APX...IWX...GRR...
   
   LAT...LON   43478640 44038281 42918242 42568257 42678261 42668276
               42508283 42318299 42218312 42058314 41958320 41808345
               41748347 41718478 42078477 42038623 42258623 42248634
               42548622 42968620 43178629 43478640