Mesoscale Discussion 1945
   NWS Storm Prediction Center Norman OK
   0749 PM CDT Mon Sep 09 2019

   Areas affected...Parts of northeast Iowa and adjacent southeast
   Minnesota...southwest Wisconsin...northwest Illinois

   Concerning...Tornado Watch 639...

   Valid 100049Z - 100215Z

   The severe weather threat for Tornado Watch 639 continues.

   SUMMARY...Strong to severe thunderstorm development may continue
   across parts of northeastern Iowa another couple of hours, but
   storms spreading to the northeast of the watch are expected to
   weaken and result in diminishing severe weather potential.  A new
   severe weather watch probably will not be needed.

   DISCUSSION...Lift, aided by low-level warm advection along the
   frontal zone, and continuing inflow of seasonably moist air
   characterized by CAPE of 2000-3000 J/kg, may maintain vigorous
   thunderstorm development northwest through northeast of Cedar Rapids
   into the 02-03Z time frame.  Otherwise, as the forward/northeastward
   propagating portion of the convective system continues to spread
   above/to the cool side of the front, instability within the inflow
   to this activity likely will decrease and result in diminishing
   intensity to storms, as well as lessening potential for strong
   surface gusts.

   ..Kerr.. 09/10/2019

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

   ATTN...WFO...MKX...DVN...ARX...DMX...

   LAT...LON   43739212 43629084 42719011 42129082 42059204 42249281
               42989298 43739212