Abertawe Bro Morgannwg University Health Board says it has seen a high number of emergency admissions, and its A&E departments are extremely busy and under pressure.
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Fine and dry at first but becoming largely cloudy with outbreaks of rain or drizzle.
First Minister Carwyn Jones says Wales must not get a bad deal in Brexit negotiations. He was speaking at meeting of British-Irish Council.
Isolated showers may last into the late evening, but a dry night.