MESOSCALE DISCUSSION 2013
   NWS STORM PREDICTION CENTER NORMAN OK
   1052 PM CDT SUN SEP 13 2009
   
   AREAS AFFECTED...ERN MT
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 740...
   
   VALID 140352Z - 140445Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 740
   CONTINUES.
   
   AN ISOLATED SEVERE THREAT MAY CONTINUE WITH THE CONVECTION ONGOING
   IN FAR ERN MT. RUC ANALYSIS SUGGESTS VERTICAL SHEAR AND INSTABILITY
   WILL CONTINUE TO SUPPORT ORGANIZED STORMS FOR ANOTHER 1-2 HOURS.
   HOWEVER...THE THREATS SHOULD BECOME INCREASINGLY MARGINAL WITH TIME.
   ANY SEVERE THREAT IS EXPECTED TO STAY WEST OF THE NORTH DAKOTA
   STATE-LINE. A LOCAL WATCH EXTENSION MAY BE NECESSARY FOR THE ONGOING
   SEVERE THREAT IN NE MT FOR PART OF THE OVERNIGHT PERIOD.
   
   ..BROYLES.. 09/14/2009
   
   
   ATTN...WFO...GGW...
   
   LAT...LON   47380413 47080499 47090573 47220606 47730645 48230644
               48740623 48960565 49050520 48970452 48650418 48450416
               47380413