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Mesoscale Discussion 976
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   Mesoscale Discussion 0976
   NWS Storm Prediction Center Norman OK
   0708 PM CDT Fri Jun 09 2017

   Areas affected...Portions of ND and northwestern MN

   Concerning...Severe Thunderstorm Watch 309...

   Valid 100008Z - 100115Z

   The severe weather threat for Severe Thunderstorm Watch 309
   continues.

   SUMMARY...A damaging wind and large hail threat continues across WW
   309. A local extension in area of the watch into parts of
   northwestern MN may be needed within the next hour.

   DISCUSSION...As of 00Z, multiple measured severe wind gusts of
   83-104 mph have occurred over the past hour with a supercell
   thunderstorm evolving into a small bow across Pierce into Benson
   Counties in ND. A separate supercell in Wells County ND has recently
   produced multiple large hail reports, some as large as 2 inches in
   diameter. Finally, another supercell producing measured severe wind
   gusts is moving southeastward along to perhaps just north of a
   surface warm front draped across ND into western MN. The environment
   downstream of this ongoing activity into eastern ND will remain
   favorable for continued severe storm maintenance, with large hail,
   damaging winds, and perhaps a tornado or two all possible. If any
   supercell can remain discrete, the tornado threat may become
   maximized near the warm front with locally backed surface winds
   enhancing effective SRH. The warm front should serve as an eastward
   limit to the more substantial surface-based supercell threat. Based
   of its current position, a small eastward extension in area for the
   ongoing Severe Thunderstorm Watch may be warranted for parts of
   northwestern MN based on current radar trends.

   ..Gleason.. 06/10/2017

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

   ATTN...WFO...FGF...BIS...

   LAT...LON   46620006 49040012 49019623 46589627 46620006 

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