ZCZC SPCSWOMCD ALL ACUS11 KWNS 140253 SPC MCD 140253 SDZ000-NDZ000-MTZ000-WYZ000-140430- Mesoscale Discussion 1280 NWS Storm Prediction Center Norman OK 0953 PM CDT Fri Jun 13 2025 Areas affected...Eastern MT into northeast WY and northwest SD Concerning...Severe Thunderstorm Watch 411...412... Valid 140253Z - 140430Z The severe weather threat for Severe Thunderstorm Watch 411, 412 continues. SUMMARY...At least an isolated severe threat may continue through late evening. WW 411 has been extended to 10 PM MDT. DISCUSSION...An earlier intense supercell cluster has weakened slightly across southeast MT, but likely remains severe as of 0245 UTC, and additional storms have intensified to its north and east. This convection across southeast MT is ongoing within a moderately unstable and favorably sheared environment, and will likely continue to pose at least an isolated severe threat through late evening. There is some indication that the ongoing storms across Rosebud County may evolve into a larger cluster with time. While MLCINH will generally increase with time and eastward extent, any organized upscale growth could support a greater longevity of the severe wind and hail threat into far southeast MT and perhaps northwest SD and vicinity. WW 411 has been extended in time to 10 PM MDT, and trends will be monitored regarding the potential for any downstream watch issuance late tonight. Farther north, a marginal supercell is ongoing across northeast MT, to the northeast of Glasgow. Instability is weaker in this area, but the KGGW VWP depicts a favorably veering wind profile, and an isolated severe threat could accompany this cell before it eventually weakens. ..Dean/Smith.. 06/14/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...BIS...UNR...BYZ...GGW... LAT...LON 45320704 47210659 48620749 48630679 48580602 46600471 45860363 44910295 44710431 44770558 44820626 45320704 MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 95 MPH MOST PROBABLE PEAK WIND GUST...65-80 MPH MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN NNNN