ISOLATED thunderstorms and the prospect of heavy rainfall could be on the way for North Devon this week. Earlier today the Met Office issued a yellow warning for rain for Tuesday and Wednesday with an increased risk of torrential downpours in places. But later this morning the warning was changed with the warning being removed from Wednesday. A spokesman for the forecasters said: An area of low pressure is expected to increasingly interact with the plume of hot, humid air resident across parts of southern Britain. Whilst preceding days will have seen relatively isolated thunderstorms, the developing set-up on Tuesday and Wednesday, provides the ingredients for more widespread and energetic storms. Large rainfall totals, falling in short periods (perhaps exceeding 50 mm in three hours) and onto hard-baked ground, may lead to flooding locally, with hail and gusty winds an additional possibility. As is common in such situations, not everywhere will catch the heaviest of the storms, and some places may well escape altogether.