Mesoscale Discussion 0975 NWS Storm Prediction Center Norman OK 0809 PM CDT Wed Jun 03 2026 Areas affected...Parts of south-central into southeast SD Concerning...Tornado Watch 271... Valid 040109Z - 040245Z The severe weather threat for Tornado Watch 271 continues. SUMMARY...Some threat for tornadoes, large to very large hail, and localized severe gusts will continue through dusk. DISCUSSION...A long-lived supercell with a history of producing a tornado is ongoing this evening between Chamberlain and Winner, SD. A general increase in convection has been noted to the east/northeast of this cell, and also to its south along a cold front. While low-level flow is generally modest across the region, some increase has recently been noted in the KABR VWP. Also, surface observations indicate strengthening southeasterly surface winds to the east of the primary supercell and expanding area of convection, suggesting some localized increase in low-level shear/SRH. As a result, some tornado threat will continue with this increasing storm cluster through dusk. Increasing storm coverage may result in modest upscale growth and an increasing severe-wind threat, though cell mergers could also briefly enhance tornado potential. Otherwise, large to very large hail will continue to be a threat with any sustained supercells. ..Dean.. 06/04/2026 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...FSD...ABR...UNR... LAT...LON 43099989 43639971 44289864 44459772 44289756 43869750 43559762 43299792 43109841 43109894 43099989 MOST PROBABLE PEAK TORNADO INTENSITY...100-125 MPH MOST PROBABLE PEAK WIND GUST...55-70 MPH MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN
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