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Mesoscale Discussion 1371
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   Mesoscale Discussion 1371
   NWS Storm Prediction Center Norman OK
   0627 PM CDT Thu Jul 20 2017

   Areas affected...Portions of central/eastern Maine

   Concerning...Severe potential...Watch unlikely 

   Valid 202327Z - 210100Z

   Probability of Watch Issuance...20 percent

   SUMMARY...A relatively short term threat for locally large hail and
   damaging wind will exist this evening.

   DISCUSSION...An intense thunderstorm has recently developed
   northwest of Bangor, with other cells developing across portions of
   central Maine. Steep lapse rates and moderate midlevel
   flow/effective shear will support some organized storm structures
   this evening as an upper trough swings through the region. A couple
   of supercells will be possible with a localized threat of large hail
   and damaging wind. Given the number of cells developing northwest of
   Bangor, some consolidation into a forward-propagating cluster is
   possible, with a continued risk of damaging wind and isolated large
   hail. 

   With the onset of nocturnal cooling this evening, the severe threat
   is expected to peak between now and 01Z, with a diminishing trend
   expected as SBCINH increases later tonight. Given the relatively
   limited spatiotemporal extent of the threat, watch issuance is not
   currently anticipated.

   ..Dean/Guyer.. 07/20/2017

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

   ATTN...WFO...CAR...GYX...

   LAT...LON   45066993 45576966 45756921 45836870 45816794 45466759
               44886767 44486874 44526911 44556966 44836982 45066993 

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