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Mesoscale Discussion 918
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   Mesoscale Discussion 0918
   NWS Storm Prediction Center Norman OK
   1252 AM CDT Fri Jun 11 2021

   Areas affected...eastern SD/ND and northeast NE

   Concerning...Severe potential...Severe Thunderstorm Watch likely 

   Valid 110552Z - 110645Z

   Probability of Watch Issuance...95 percent

   SUMMARY...A line of severe thunderstorms with a history of producing
   severe thunderstorm wind gusts and hail will continue spreading
   eastward across the Dakotas and parts of northern Nebraska
   overnight. New severe thunderstorm watches will be needed in the
   next 1-2 hours.

   DISCUSSION...Well-organized bowing segments with strong rear-inflow
   jets have been noted in radar imagery over the past hour, and have
   produced numerous severe wind gust reports. This activity will
   continue tracking generally eastward at around 40-50 kt the next
   several hours. This should bring these storms to edges of WW 253 and
   WW 254 between 07z-08z. Moderate to strong instability remains
   downstream across the eastern Dakotas into northeast NE, along with
   a southerly 850 mb jet around 35-45 kt. While low level inhibition
   exists due to nocturnal cooling of the boundary layer, very steep
   lapse rates remain between 2-6 km. As a result, a favorable
   thermodynamic and kinematic parameter space should continue to
   support a well-organized QLCS capable of severe/damaging gusts into
   portions of eastern ND/SD and northeast NE during the overnight
   hours.

   ..Leitman/Thompson.. 06/11/2021

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

   ATTN...WFO...FGF...FSD...OAX...ABR...BIS...LBF...UNR...

   LAT...LON   48420008 48829965 48929895 48839815 48309761 47169705
               45319683 43959664 42769680 41979722 41909820 41919898
               42249970 43509988 45520016 48130010 48420008 

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