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Mesoscale Discussion 920
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   Mesoscale Discussion 0920
   NWS Storm Prediction Center Norman OK
   0728 AM CDT Fri Jun 11 2021

   Areas affected...portions of eastern NE and western IA

   Concerning...Severe Thunderstorm Watch 257...

   Valid 111228Z - 111400Z

   The severe weather threat for Severe Thunderstorm Watch 257
   continues.

   SUMMARY...Damaging wind gusts are possible for another couple of
   hours across parts of eastern Nebraska and perhaps far southwest
   Iowa

   DISCUSSION...A south/southeastward-advancing bow is producing
   near-severe level wind speeds this morning across northeast NE.
   Recently, a 49 kt gust was measured at KOFK. Velocity data from KOAX
   also shows strong inbound signatures while the VWP from KFSD
   indicated a rear-inflow jet up to 65 kt around 1-2 km. The bowing
   segment will tracking along a stronger instability gradient amid
   modest shear and strong low level inhibition. Nevertheless, wind
   gusts around 45-55 kt appear possible at least in the short term,
   and could persist another 1-2 hours. A local extension of WW 257 or
   a new downstream watch is being considered.

   ..Leitman.. 06/11/2021

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

   ATTN...WFO...FSD...OAX...GID...

   LAT...LON   41889827 42339792 42489730 42539660 42469629 42249595
               41459549 40809553 40729609 40809734 41179816 41889827 

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Page last modified: June 11, 2021
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