Storm Prediction Center Mesoscale Discussion 412

   Mesoscale Discussion 0412
   NWS Storm Prediction Center Norman OK
   0757 PM CDT Mon Apr 13 2026

   Areas affected...West-central into central Wisconsin

   Concerning...Tornado Watch 103...

   Valid 140057Z - 140230Z

   The severe weather threat for Tornado Watch 103 continues.

   SUMMARY...A threat for tornadoes will continue into the evening as
   low-level shear increases. Furthermore, upscale growth of ongoing
   supercells  will also lead to an increase threat for severe winds.

   DISCUSSION...Two supercells are ongoing west and northeast of Black
   River Falls. The high-precipitation character of these storms has
   become more apparent over the last couple of hours. The storm west
   of BRF shows a strong, but broad mesocyclone along with a strong
   rear flank downdraft signal on radar. With continued warm advection
   and upscale growth, an increasing threat for severe winds may
   develop as they progress east-southeast. To the east, cooler air is
   noted in surface observations which would suggest the strongest
   activity may turn slightly southward into greater buoyancy. The
   tornado threat will continue, however, as large low-level hodographs
   are evident on KARX and KMKX. Large hail could occur on an isolated
   basis, but storm mode will likely become less favorable with time.

   ..Wendt.. 04/14/2026

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

   ATTN...WFO...GRB...MKX...ARX...MPX...

   LAT...LON   44189145 44659094 44909017 44698951 43988866 43698884
               43508916 43488972 43859068 44189145 

   MOST PROBABLE PEAK TORNADO INTENSITY...100-130 MPH
   MOST PROBABLE PEAK WIND GUST...55-70 MPH
   MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN