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Mesoscale Discussion 745
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   Mesoscale Discussion 0745
   NWS Storm Prediction Center Norman OK
   0702 PM CDT Thu May 12 2022

   Areas affected...Northwest Iowa

   Concerning...Severe Thunderstorm Watch 206...208...

   Valid 130002Z - 130130Z

   The severe weather threat for Severe Thunderstorm Watch 206, 208

   SUMMARY...The damaging wind threat will persist into the late
   evening/early overnight hours.

   DISCUSSION...A bowing line segment is currently moving through far
   eastern Nebraska where several reports of 65 to 80 mph wind gusts
   have been received in the last 15 minutes. The outflow boundary is
   now well ahead of the convection based on the KOAX WSR-88D. However,
   it appears balanced enough to continue to support additional
   convection and a strengthening cold pool, especially on northern
   portions of the bow where the shear vector is oriented more
   favorably for more upright convection. The environment downstream of
   this bowing segment remains very favorable for severe wind gusts
   with temperatures in the 90s and dewpoints in the low to mid 60s
   yielding MLCAPE around 2000 J/kg. 

   The current trajectory of this bow will take it into northwest and
   eventually northern Iowa later this evening and into the early
   overnight hours. In addition, the last several runs of the WoFs
   suggest severe wind gusts may persist into northern Iowa before
   weakening below severe limits. Therefore, severe thunderstorm watch
   212 has been coordinated with WFO Des Moines to cover the damaging
   wind threat downstream of this ongoing line of storms.

   ..Bentley/Hart.. 05/13/2022

   ...Please see for graphic product...


   LAT...LON   43459341 43259344 42709381 41969439 41569512 41439584
               41889622 42259630 42599641 42729641 43319574 43589375

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