This story has been made freely available as a public service to our readers. Please consider supporting SCMP’s journalism by subscribing. Hong Kong issued an amber rainstorm warning on Sunday afternoon in response to intense thundery showers influenced by a trough of low pressure, coinciding with the city’s marking of the Ching Ming Festival. The Observatory said in the morning that a band of intense thundery showers over the seas south of the city had been gradually edging closer to the...