Isolated heavy showers could develop almost anywhere, but the main focus being highlighted by the LOW areas, but even here the chance of lightning is still considered quite low. Slow storm-motion and/or back-building will result in some locally prolonged heavy downpours, perhaps causing some localised surface water flooding - especially across parts of NE England and S/SE Scotland. A highly-sheared environment across these areas as a northerly jet encroaches from the Atlantic suggests that environmental conditions will be more favourable for lightning across N + E England and S Scotland. Small hail may accompany any stronger cells.