This story has been made freely available as a public service to our readers. Please consider supporting SCMP’s journalism by subscribing.Intense thundery showers are approaching Hong Kong under the influence of a trough of low pressure, even as authorities expect residents to flock to family graves for the Ching Ming Festival.The Hong Kong Observatory said at 10am on Sunday that a band of intense thundery showers over the seas south of the city was gradually edging closer to the vicinity of...