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Mesoscale Discussion 689
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   Mesoscale Discussion 0689
   NWS Storm Prediction Center Norman OK
   0811 PM CDT Sat Jun 09 2018

   Areas affected...portions of central MT

   Concerning...Severe Thunderstorm Watch 166...

   Valid 100111Z - 100245Z

   The severe weather threat for Severe Thunderstorm Watch 166
   continues.

   SUMMARY...Storms have intensified along the eastern periphery of WW
   166 this evening. A severe threat may spread into adjacent Fergus
   and Blaine Counties and the watch has been extended into these
   counties.

   DISCUSSION...Storms have increased in intensity over the last hour
   just to the west of LWT to HVR. Moist upslope flow into the higher
   terrain of Judith Basin and Chouteau Counties is evident per recent
   increasing dewpoints at HVR and LWT into the low to mid 50s. As a
   result, storms moving off of higher terrain will be encountering a
   more moist and unstable airmass, and additional strengthening is
   possible. As such, a local extension in watch area has been
   collaborated with WFO Great Falls. Large hail and strong wind gusts
   will be the main threat with these storms as they quickly track
   northeast.

   ..Leitman.. 06/10/2018

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

   ATTN...WFO...BYZ...GGW...TFX...

   LAT...LON   48981108 49010825 46830866 46760898 46690954 46660990
               46791033 47031064 47741091 48981108 

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Page last modified: June 10, 2018
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