ZCZC SPCSWOMCD ALL ACUS11 KWNS 252219 SPC MCD 252219 SCZ000-260015- Mesoscale Discussion 1443 NWS Storm Prediction Center Norman OK 0519 PM CDT Wed Jun 25 2025 Areas affected...Central South Carolina Concerning...Severe Thunderstorm Watch 459... Valid 252219Z - 260015Z The severe weather threat for Severe Thunderstorm Watch 459 continues. SUMMARY...The threat for damaging/severe winds is expected to increase over the next couple of hours across central South Carolina as thunderstorm clusters begin to merge within a very unstable environment. DISCUSSION...Two convective clusters have now become apparent over the Carolinas. The first, propagating south/southwest closer to the Carolina coast, appears to be well-balanced with new, deep updrafts developing along the leading edge of a consolidating cold pool. To the west, a secondary cluster is moving south off of the higher terrain and into deeper low-level moisture. Despite being outflow dominant, GOES 1-minute imagery shows robust convection erupting on the immediate cool side of the outflow boundary, hinting that this cluster may attain a more balanced updraft/downdraft convergence zone in the near future as additional cells develop along the leading edge of the cold pool. Both of these clusters are propagating into an environment characterized by MLCAPE values upwards of 3500 J/kg, and while some anvil shading is occurring immediately ahead of the clusters, the lack of widespread boundary-layer cumulus and dewpoints falling into the upper 60s across central SC suggests a dry, deeply mixing environment is downstream of both clusters. These low-level thermodynamic conditions should be very favorable for downdraft accelerations and damaging to severe downburst winds. The severe threat may be maximized where the two clusters merge in the coming 1-2 hours, and potentially along a subtle low-level confluence zone draped across the state. ..Moore.. 06/25/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...ILM...CHS...CAE...GSP... LAT...LON 34868140 34558215 34308229 34108223 33748189 33518165 33308131 33218080 33298011 33407968 33637949 33947950 34217975 34838085 34908122 34868140 MOST PROBABLE PEAK WIND GUST...55-70 MPH MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN NNNN