Hong Kong emergency crews worked around the clock with robotic “water-pumping dragons” to clear widespread flooding in the northern New Territories after intense downpours triggered a brief red rainstorm warning early Thursday. The red rainstorm signal was issued at 2.40am, following an amber warning that had been in force since 9pm on Wednesday and a flooding alert for the northern New Territories. The signal was downgraded to amber at 5.15am, which was later cancelled at 9.30am, along with the...