Upper trough sliding east will graze the Northern Isles on Sunday afternoon and evening, with cool air aloft helping to steepen mid-level lapse rates. Some isolated lightning will be possible from scattered showers, perhaps organised along a shortwave trough during the second half of the afternoon.

Residual low-level moisture from weak cold front slowly drifting south, combined with some convective overturning / insolation, may allow a couple heavy showers to develop on Sunday afternoon/early evening. Overall convective depth considered too shallow for lightning, and so no LOW threat level included for now.