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Mesoscale Discussion 1006
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   Mesoscale Discussion 1006
   NWS Storm Prediction Center Norman OK
   1114 PM CDT Mon Jun 12 2017

   Areas affected...Western...central and northern SD and northwest NE

   Concerning...Tornado Watch 320...

   Valid 130414Z - 130545Z

   The severe weather threat for Tornado Watch 320 continues.

   SUMMARY...All severe hazards remain possible with the storms moving
   northeast through northwest NE and southwest SD.  Meanwhile, a
   bowing line has recently formed in the SD counties of Jackson and
   Bennett.  This bowing line and at least one additional bowing line
   expected to form in southwest SD overnight will pose a threat for
   damaging winds across parts of central and northern SD, where a new
   WW will be coordinated soon.  Additional storms may form in
   northeast SD ahead of the lead bow with a threat for hail and strong
   wind gusts.

   DISCUSSION...CAPE/shear parameter space including strong effective
   SRH remains favorable for discrete/semi-discrete supercells with an
   attendant tornado threat across the valid portions of WW 320 in
   northwest NE to western SD.  Mosaic radar imagery indicated the
   recent development of a bow in Jackson and Bennett Counties SD, with
   this bow tracking toward the northeast.  Last several runs of the
   HRRR continued to suggest upscale development of one or two bows
   tracking from southwest to central and northern SD through the
   overnight.  

   This downstream environment was supporting of sustained bow
   structures as strengthening southerly low-level winds result in
   further poleward theta-e advection across SD.  This combined with
   forcing for ascent with height falls ahead of the
   northeastward-moving Great Basin upper low will support storm
   development through tonight.

   ..Peters/Edwards.. 06/13/2017

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

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

   LAT...LON   45859797 45489734 44389772 43589879 43139968 42140037
               41740168 42110243 42070360 42650397 43430391 44320337
               45510197 45710142 45899966 45859797 

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Page last modified: June 13, 2017
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