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Mesoscale Discussion 449
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   Mesoscale Discussion 0449
   NWS Storm Prediction Center Norman OK
   1003 PM CDT Thu May 17 2018

   Areas affected...Central South Dakota through much of western and
   central Nebraska

   Concerning...Severe Thunderstorm Watch 100...102...103...

   Valid 180303Z - 180500Z

   The severe weather threat for Severe Thunderstorm Watch 100, 102,
   103 continues.

   SUMMARY...The severe threat will continue across the discussion area
   for the next couple of hours.  Damaging wind gusts are the primary
   threat, although large hail remains possible with cellular
   convection and more dominant cores.

   DISCUSSION...Storms have now mostly congealed into a large,
   forward-propagating MCS extending from central South Dakota (near
   Pierre) south-southwestward to near Sidney, NE currently.  More
   cellular convection was located on the southwestern flank of the
   complex near the Sidney area, with occasional large hail reported
   and indicated on radar.  Elsewhere, occasional severe wind gusts
   have been reported with the MCS, and this activity should continue
   for the next couple of hours or so as storms continue to reside in a
   north-to-south oriented instability axis across the region.  The
   remainder of the severe threat will likely be handled with continued
   local space/time extensions of ongoing watches, which will be
   coordinated with local WFOs as needed.  This threat may persist
   beyond 05Z in portions of Nebraska, where storms will have a longer
   residence time within the axis of moderate instability.

   ..Cook/Hart.. 05/18/2018

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

   ATTN...WFO...FSD...ABR...LBF...UNR...BOU...CYS...

   LAT...LON   41150323 41430282 41950256 42530227 42970195 43590162
               44120120 44490082 44690044 44749997 44619951 44379930
               43909920 43119930 42319935 41639968 41110033 40700127
               40600230 40700291 41150323 

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Page last modified: May 18, 2018
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