The Met Office says many parts will see a good deal of dry weather, but areas of thunderstorms are likely to continue to develop over parts of the UK on Wednesday, particularly later in the afternoon. This includes Devon and Cornwall but we are not sure of exactly where.
Many places will stay dry. However, where the storms occur they will be intense.
Rainfall totals of 30-40 mm may fall in less than an hour, with a small chance of 60 mm falling in an hour and 70-100 mm falling in 2-3 hours.
Large hail, frequent lightning and gusty winds will be additional hazards.
Most thunderstorms will die out during the evening though a few may continue in to the night.