Storm Prediction Center Mesoscale Discussion 1445

   Mesoscale Discussion 1445
   NWS Storm Prediction Center Norman OK
   0341 PM CDT Thu Jul 02 2026

   Areas affected...east-central South Dakota

   Concerning...Severe Thunderstorm Watch 439...

   Valid 022041Z - 022215Z

   The severe weather threat for Severe Thunderstorm Watch 439
   continues.

   SUMMARY...A cluster of supercells will continue slowly eastward this
   afternoon and evening.

   DISCUSSION...Very large hail (up to 3 inches) and brief tornadoes
   have been reported with the supercell that began in Brule county and
   has moved slowly northeastward. The tornado threat will likely
   remain as this supercell moves along the stalled outflow boundary.
   The cluster of supercells from the west is moving eastward quickly
   and will likely overtake this supercell within the hour. Additional
   convection to the south (with a recent measured 69 mph wind gust)
   indicates the potential for additional development and some upscale
   growth. If this occurs and the cluster accelerates east/southeast,
   watch 439 may need to be expanded.

   ..Bentley.. 07/02/2026

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

   ATTN...WFO...FSD...ABR...UNR...

   LAT...LON   44200004 44359866 44499818 44539736 44269715 43999740
               43749821 43589904 43669967 43960022 44200004 

   MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 90 MPH
   MOST PROBABLE PEAK WIND GUST...65-80 MPH
   MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN