Patchy, dense fog is expected to develop during Saturday night with the visibility falling to less than 50 metres in places. Fog is expected to become increasingly widespread within this area during the second half of the night before only slowly clearing during Sunday morning; slowest across parts of the West Country and central southern England. For further details see https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings

Information on update: Parts of East Anglia removed from warning, which has also been extended a little further west and northwest to account for latest observations and data. Clearing skies over southeast England this evening and overnight, which has already led to the development of mist and some patchy fog, is likely to allow increasingly widespread and in places dense fog to form. Visibility will fall below 100m in some places. The fog will gradually lift and clear to mist and haze during Saturday morning, persisting longest where visibilities are poorest early on. For further details see https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings