This is also likely to affect roads and rail travel and commuters are asked to consider only taking essential journeys.
According to the Met Office, a 'mix of rain, sleet, snow and hail showers' is likely, and with temperatures plummeting tonight, this will in many cases turn to ice, with 'black ice' on the roads.
"With road temperatures falling to around zero inland, the public should be aware of the risk of ice, chiefly over high ground, but also locally to lower levels where hail showers occur."
The Met Office's Chief Forecasters assessment is: "A cold and showery westerly airstream will become established across England and Wales during Wednesday evening, with the showers turning to a wintry mix overnight. Heavy showers of hail may lead to a temporary covering of hail at lower levels, whilst localised accumulations of 1-3 cm of snow are possible on roads above 200-300 metres."