The Met Office has forecasted patchy fog, which will be particularly dense in places, will form after dark today and last until tomorrow morning. It adds that freezing fog is also a possibility during the evening and visibility could be less than 100m in places. The chief forecaster said: With light winds and clear skies across southern Britain this evening, as well as wet ground (following recent heavy rain), quickly falling temperatures are likely to lead to formation of fog patches. Once formed these are likely to persist overnight into Tuesday morning. However, a front moving northwards across the English Channel may introduce sufficient cloud and breeze to disperse the fog across southern England towards morning.