SPC MD 977

MD 0977 CONCERNING SEVERE POTENTIAL...WATCH UNLIKELY FOR PORTIONS OF CENTRAL/EASTERN SOUTH DAKOTA Mesoscale Discussion 0977 NWS Storm Prediction Center Norman OK 0126 PM CDT Thu Jun 04 2026 Areas affected...portions of central/eastern South Dakota Concerning...Severe potential...Watch unlikely Valid 041826Z - 042000Z Probability of Watch Issuance...20 percent SUMMARY...A few instances of small to marginally severe hail and strong wind gusts may occur with with convection along a surface frontal boundary through early-to-mid afternoon. Storm coverage and severe potential are the expected to increase later this afternoon/evening. DISCUSSION...Latest regional radar imagery depicts isolated thunderstorms ongoing along a surface frontal boundary ahead of a weak surface low analyzed southeast of Pierre, South Dakota. IR satellite imagery has depicted brief periods of cooler cloud tops indicative of marginally stronger/deeper updraft development. Steep mid-level lapse rates (as sampled by the 18z UNR/ABR observed soundings) and effective shear of 25-35 kts may support isolated small to marginally severe hail and strong wind gusts with this activity over the next 1-2 hours. Latest objective analysis also indicates MLCIN continues to erode, with deepening cumulus noted on visible satellite imagery south of the frontal boundary amid warming surface temperatures. This should promote a gradual increase in storm coverage and severe threat later this afternoon. ..Chalmers/Mosier.. 06/04/2026 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...FSD...ABR... LAT...LON 44519958 44729942 44929901 44929888 45009825 45059758 44969717 44769696 44539688 44269687 43889703 43739722 43619777 43589825 43579876 43629924 43829951 44219964 44519958 MOST PROBABLE PEAK WIND GUST...UP TO 60 MPH MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN Read more