Mesoscale Discussion 0691
   NWS Storm Prediction Center Norman OK
   1144 PM CDT Sat Jun 09 2018

   Areas affected...parts of eastern Iowa...southwest Wisconsin...and
   northwest Illinois

   Concerning...Severe Thunderstorm Watch 167...

   Valid 100444Z - 100645Z

   The severe weather threat for Severe Thunderstorm Watch 167
   continues.

   SUMMARY...Local risk for damaging winds, and some potential for hail
   up to an inch in diameter, continues in/near WW 167.

   DISCUSSION...Latest radar loop shows an increasingly
   organized/bowing band of storms crossing east-central Iowa at this
   time, which continues moving east-southeastward.  While the greatest
   instability remains to the southwest of the ongoing cluster (hence
   the tendency for backbuilding updraft development), a secondary axis
   of mixed-layer CAPE near or below 1000 J/kg extends southeastward
   along the warm frontal zone -- roughly demarcated by a developing
   band of convection extending from the main/bowing band of storms
   into north central Illinois.  

   Expect the MCS to continue advancing east-southeast over the next
   couple of hours, fueled by the aforementioned instability axis, and
   aided with respect to organization by enhanced (35-45 kt) flow
   centered near the 700 mb layer per area VWPs.  With surface
   dewpoints near 70 along the boundary, suggestive of only a rather
   weakly stable boundary layer, potential for gusty/locally damaging
   winds persists, and should linger for at least another couple of
   hours.

   ..Goss.. 06/10/2018

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

   ATTN...WFO...LOT...ILX...MKX...DVN...ARX...DMX...

   LAT...LON   41719294 42089209 42259123 43119054 42448881 41438876
               41108907 41159064 41459234 41719294