Gwent Police says officers are concerned about the safety and wellbeing of missing 13-year-old Michael Driver because of his age.
He was last seen at his home in Rogiet, near Chepstow in Monmouthshire, on Saturday 12 October.
Anyone who has seen him or has any information about his whereabouts is urged to ring 101 or Crimestoppers on 0800 555 111.
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An Amber weather warning has been issued for Conwy, Denbighshire, Flintshire, Gwynedd, Isle of Anglesey, Powys, Wrexham and Ceredigion.
Storm Doris will bring a squally band of rain at first with disruptive gales, especially further north.
Winds will strengthen to gale force by dawn, these severe across exposed coasts and hills particularly in the southwest.