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Storm Prediction Center Mesoscale Discussion 879

Mesoscale Discussion 879
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   Mesoscale Discussion 0879
   NWS Storm Prediction Center Norman OK
   0509 PM CDT Tue May 21 2024

   Areas affected...Central Iowa into northeast Iowa and far southwest

   Concerning...Tornado Watch 277...

   Valid 212209Z - 212345Z

   The severe weather threat for Tornado Watch 277 continues.

   SUMMARY...Intense to potentially violent tornado threat across
   northeast Iowa and into southwest Wisconsin over the next 2 hours

   DISCUSSION...The supercell which formed the intense to potentially
   violent tornado which impacted Greenfield and other portions of
   southwest Iowa this afternoon has re-intensified after storm
   mergers. This storm and another strong supercell to its south are
   moving into an increasingly favorable tornadic environment with a
   STP of 5 to 6 (per SPC mesoanalysis). The backed surface winds and
   vorticity rich environment in the wake of the morning convection
   will provide ample low-level vorticity for a sustained tornado
   threat into the early evening. One or more long-track, potentially
   violent tornadoes are possible in this corridor over the next 90 to
   120 minutes.

   ..Bentley/Thompson.. 05/21/2024

   ...Please see for graphic product...


   LAT...LON   43319094 43149080 42899079 42509117 41569273 41459346
               42039360 42679316 43289233 43499174 43489133 43499120

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