Information on update: Warning area expanded to include more parts of Wales and northern England, start time also brought forward. Rain, associated with Storm Goretti, will spread northeastwards across the warning area through Thursday afternoon and evening, transitioning to snow fairly widely overnight and into Friday. Snow initially will begin to accumulate across hills in Wales and then increasingly to lower levels overnight. Whilst not all areas may see accumulating snow, accumulations of 5-10 cm are likely quite widely, with scope for 15-25 cm in places, especially on some hills above 200 metres elevation. There is a chance of 30 cm accumulating over high ground in Wales and/or the Peak District. There is some uncertainty over the exact track of Storm Goretti, which will influence the locations most likely to see disruptive snow. Amounts of snow will also depend quite heavily on both elevation and the intensity of precipitation, and as this becomes somewhat lighter into Friday this will lead to an awkward mix of rain, sleet and snow, gradually clearing away to the east. Therefore there is likely to be a lot of variation, even over relatively short distances. The low pressure system has been named by Meteo France, as the strongest winds associated with Storm Goretti are most likely over northern France. For further details see https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings

Outbreaks of rain will become persistent and heavy through Thursday afternoon, evening and night, before easing and clearing to the east by Friday morning. Heavy showers will follow for a time on Friday morning. Whilst this may fall as snow over hills, covered by a separate snow warning, rain accumulations of 20-40 mm are possible, with perhaps as much as 60 mm in a few places. This, combined with snow melt, may lead to some surface water flooding. For further details see https://www.metoffice.gov.uk/weather/warnings-and-advice/uk-warnings