Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0734 PM CDT Sat Mar 21 2026 Valid 220100Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Ongoing thunderstorms across the southern Appalachians will continue to pose a threat for lightning into the Carolinas this evening. ... 01Z Update ... Showers and thunderstorms associated with a subtle mid-level trough will continue to move across the southern Appalachians into the Carolinas this evening. Recent mesoanalysis suggests deep-layer shear is around 30 knots and most-unstable CAPE up to 500 J/kg. However, ongoing convection has struggled to maintain robust updrafts within this environment. Given weak forcing for ascent, increasing convective inhibition, and decreasing instability this evening, any severe wind or hail potential should remain less than 5% coverage. Thunderstorms should dissipate later this evening into the early morning. ..Marsh.. 03/22/2026Read more