Elsewhere, frequent showers will pile into western Scotland and the Northern Isles, in an environment with very steep mid-level lapse rates and 300-500 J/kg CAPE. Some sporadic lightning may be possible at times, particularly first thing on Sunday morning and then again for a time on Sunday evening, with a relative lull in activity possible during Sunday daytime. A low-end SLGT has been issued where lightning is considered most likely, but even here many places will probably remain void of lightning activity. The most organised cells will produce some hail and gusty winds.