Subtle forcing approaching from the SW could be enough to destabilise the Theta-E ridge as it advects NE-wards through the night hours. There is a lot of uncertainty as to whether this destabilisation occurs and the exact areas most likely affected, but if it does then a few elevated thunderstorms would be possible during the early hours of Tuesday, potentially quite electrically-active, these then persisting beyond this forecast period into East Anglia on Tuesday morning. A low-end SLGT has been issued for now, but this may need adjusting (or removing) based on trends through the day.

Behind the cold front, broad upper trough approaching from the Atlantic will introduce steeper lapse rates and a deep convection regime to northwestern areas towards the end of Monday night. Some sporadic lightning and gusty winds will be possible from scattered heavy showers.