Mesoscale Discussion 0736
   NWS Storm Prediction Center Norman OK
   0353 PM CDT Tue May 26 2020

   Areas affected...Central Iowa through southeastern Minnesota

   Concerning...Tornado Watch 229...

   Valid 262053Z - 262200Z

   The severe weather threat for Tornado Watch 229 continues.

   SUMMARY...Potential for additional tornadoes is becoming more
   unclear, but what potential lingers appears maximized across the
   Fort Dodge to Mason City vicinity of north central Iowa through 4-5
   PM.  It is not certain that a new Tornado Watch will be needed north
   of WW 229, but trends will continue to be monitored for this
   possibility.

   DISCUSSION...The surface low center has migrated to the north of the
   Kansas City metropolitan area, with latest Rapid Refresh suggesting
   that strongest ambient low-level vertical vorticity remains focused
   along a frontal zone to its northeast, roughly along the I-35
   corridor, southwest through north of the Des Moines area.  Strongest
   2-hourly surface pressure falls have shifted to the north-northeast
   of Des Moines, with the progression of the sheared mid-level
   perturbation, and the nose of a weakening (but still 30+ kt)
   southerly 850 mb jet is approaching the eastern Iowa/Minnesota
   border area.

   In general, strongest low-level vertical shear appears to have
   weakened somewhat, and may be more displaced from the stronger
   ambient near surface vertical vorticity. Given current trends, the
   risk for additional tornadoes remains more unclear, but what
   potential lingers during the next hour or two seems maximized across
   the Fort Dodge through Mason City vicinity.

   ..Kerr.. 05/26/2020

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

   ATTN...WFO...ARX...MPX...DMX...

   LAT...LON   41879487 43009460 43799380 44499290 43869199 42409263
               41899283 41099309 41009438 41879487