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Mesoscale Discussion 1334
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   Mesoscale Discussion 1334
   NWS Storm Prediction Center Norman OK
   0622 PM CDT Mon Jul 17 2017

   Areas affected...MN...northwest WI

   Concerning...Severe Thunderstorm Watch 418...

   Valid 172322Z - 180015Z

   The severe weather threat for Severe Thunderstorm Watch 418
   continues.

   SUMMARY...Severe thunderstorm threat will focus across the southern
   and eastern portions of WW418 over the next several hours.

   DISCUSSION...Multiple thunderstorm clusters are congealing into a
   larger complex of storms over the western half of WW418. As this
   complex matures over the next few hours a larger precip shield will
   likely evolve and with it perhaps a strengthening outflow boundary.
   In the short term, several supercells have evolved ahead of a
   surface low from Douglas County MN to Morrison County MN. MRMS data
   suggests very large hail (possibly around 2 inch in diameter) is
   noted with the Morrison County supercell. While large hail is the
   primary severe threat, SRH is locally enhanced near an old outflow
   boundary that is currently draped across northern WI west along the
   southern fringe of WW418. Strongest storms should focus along/near
   this boundary and a tornado can not be ruled out; although complex
   storm mode is not particularly favorable for this development.

   ..Darrow.. 07/17/2017

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

   ATTN...WFO...DLH...MPX...FGF...

   LAT...LON   47089618 47459160 45879160 45509620 47089618 

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