Storm Prediction Center Mesoscale Discussion 1255

   Mesoscale Discussion 1255
   NWS Storm Prediction Center Norman OK
   0748 PM CDT Thu Jun 13 2024

   Areas affected...Portions of the Midwest

   Concerning...Severe Thunderstorm Watch 408...409...

   Valid 140048Z - 140215Z

   The severe weather threat for Severe Thunderstorm Watch 408, 409
   continues.

   SUMMARY...Severe thunderstorm complex will propagate southeast this
   evening. New Severe Thunderstorm Watch may be warranted downstream.

   DISCUSSION...Numerous robust thunderstorm clusters are gradually
   merging into a larger complex early this evening. Over the last hour
   or so, an expanding precip shield is beginning to evolve and an MCS
   now appears imminent as the convection propagates southeast.
   Sustained southwesterly 1km inflow appears to be aiding new updrafts
   along the western flank of the MCS over northern MO. The majority of
   large hail reports have been noted across this region, and latest
   MESH data suggests this continues. Given the upscale growth and the
   available reservoir of instability immediately downstream over
   east-central MO into central IL, there is increasing confidence the
   leading edge of this activity will spread beyond ww0409 shortly. New
   ww may be warranted soon.

   ..Darrow.. 06/14/2024

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

   ATTN...WFO...LOT...ILX...LSX...DVN...EAX...

   LAT...LON   40868864 39198833 38449087 39859342 40289142 41389057
               40868864