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Mesoscale Discussion 752
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   Mesoscale Discussion 0752
   NWS Storm Prediction Center Norman OK
   0605 PM CDT Wed May 17 2017

   Areas affected...eastern and northeastern IA...southeastern
   MN...southwest WI

   Concerning...Tornado Watch 233...234...

   Valid 172305Z - 180000Z

   The severe weather threat for Tornado Watch 233, 234 continues.

   SUMMARY...Scattered to widespread severe gusts are forecast with a
   bowing thunderstorm band over eastern portions of IA and this
   feature will move into southeastern MN and southwest WI this

   DISCUSSION...A mature and well-developed QLCS arcs from
   north-central IA into east-central and southeastern IA and it is
   moving north-northeast at 50-55 kt.  The convective band is on the
   leading edge of a mid-level dryslot punching northeastward into the
   middle-upper MS Valley in the base of a migratory shortwave trough. 
   Surface temperatures ahead of the squall line have warmed into the
   upper 70s to around 80 degrees F over much of the discussion area. 
   Marshalltown IA (KMIW) recorded a measured gust of 60-kt at 2212Z
   and Waterloo, IA (KALO) more recently observed a 61-kt gust at
   2253Z.  Expecting the QLCS to continue to result in scattered to
   widespread severe gusts (60-75 kt).  Single site radar imagery has
   also indicated the development of a couple of substantial
   mesovortices in the squall line.  A couple of short-track weak
   tornadoes are possible with any sustained/stronger mesovortex which
   appear to be most likely over northeast IA into adjacent portions of
   MN/WI over the next 1-2 hours.

   ..Smith.. 05/17/2017

   ...Please see for graphic product...


   LAT...LON   43059352 43699285 43909169 43059045 41219078 40709211
               41719186 42879259 43059352 

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