Snow's been falling for most of the night in parts of south-east Wales, and the Met Office says there's more to come.
An amber 'be prepared' warning will remain in place until 9am, with a yellow warning of ice across the whole country.
Cardiff and Vale University Health Board has cancelled the majority of outpatient appointments.
David Wood reports from Porth, in the Rhondda.
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A yellow warning for snow and ice on Thursday night and Friday has been issued.
Some wintry showers and staying windy with a significant wind chill and widespread frost developing