MESOSCALE DISCUSSION 1202
   NWS STORM PREDICTION CENTER NORMAN OK
   0144 AM CDT MON JUN 13 2011
   
   AREAS AFFECTED...SD...NEB
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 470...
   
   VALID 130644Z - 130745Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 470
   CONTINUES.
   
   SEVERE WATCH 470 WILL EXPIRE AT THE TOP OF THE HOUR. NO ADDITIONAL
   WATCHES ARE CURRENTLY ANTICIPATED ACROSS THIS REGION AT THIS TIME
   BUT STORMS ALONG THE SD/NEB BORDER WILL CONTINUE TO BE MONITORED FOR
   FURTHER UPSCALE GROWTH.
   
   A SHORT WAVE TROUGH AND CONVECTIVE UPSCALE DEVELOPMENT EARLIER
   SUNDAY EVENING RESULTED IN A WELL FORMED CYCLONIC VORTEX NOW LIFTING
   ACROSS ND ATTM. DEEP CONVECTION ALONG THE SRN FLANK OF THIS SYSTEM
   HAS PERSISTED WHERE MESOSCALE FORCING FOR ASCENT IS LIKELY ENHANCED
   IN THE PRESENCE OF STRONGER INSTABILITY. CONTINUED MASS AND MOISTURE
   FLUX INTO THIS REGION ON THE NOSE OF THE LOW LEVEL JET MAY ALLOW
   STORMS TO PERSIST IN THE FORM OF A SMALL MCS FOR SEVERAL MORE HOURS.
   WHILE ISOLATED LARGE HAIL AND/OR A DAMAGING WIND GUST WILL BE
   POSSIBLE WITH THIS ACTIVITY...THE LIMITED SPATIAL EXTENT...AND
   UNCERTAINTY REGARDING LONGEVITY SUGGEST THAT A NEW WATCH IS NOT
   LIKELY AT THIS TIME.
   
   ..CARBIN.. 06/13/2011
   
   
   ATTN...WFO...ABR...LBF...UNR...
   
   LAT...LON   43759951 42969962 42960119 43780127 44240007 44389939
               43759951