Mesoscale Discussion 1295
   NWS Storm Prediction Center Norman OK
   0428 AM CDT Sat Jun 29 2019

   Areas affected...Richland County Montana into northwest North Dakota

   Concerning...Severe Thunderstorm Watch 459...

   Valid 290928Z - 291115Z

   CORRECTED FOR HEADER

   The severe weather threat for Severe Thunderstorm Watch 459
   continues.

   SUMMARY...Storms have trended toward supercell mode over the last
   hour. Large hail, and perhaps a brief tornado are possible.

   DISCUSSION...Storms that formed along the outflow boundary have
   gradually increased in intensity, with supercells now noted on
   radar. Once such storm over Richland County MT has broad rotation,
   with a very high echo top. Another supercell now exists over western
   McKenzie County ND, just northeast of the Richland cell. Both these
   cells are near the outflow boundary. Additional cells also continue
   to strengthen northeastward into Mountrail County.

   Given supercellular mode, low-level shear may more easily become
   incorporated into the updrafts despite moderate boundary layer CIN.
   Storms may also utilize enhanced vorticity as they interact with the
   outflow boundary, and a brief tornado cannot be ruled out. Large
   hail remains likely with steep lapse rates aloft and ample moisture
   (PWAT up to 1.50").

   ..Jewell.. 06/29/2019

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...BIS...GGW...

   LAT...LON   47640438 47970390 48300318 48550269 48760231 48780185
               48570138 48130132 47860203 47650261 47600328 47520389
               47530409 47640438