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• n  a signal announcing the approach of a storm (particularly a storm of marked violence)

News & Articles

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• Hong Kong Weathers Hail as Year’s Worst Rainstorm Sweeps City
  Heavy rain swept Hong Kong yesterday evening with hail shattering windows as the city issued its highest rainstorm warning this year. The Hong Kong Observatory declared the black rainstorm signal yesterday evening as wind speeds reached 100 kilometers (62 miles) an hour. The hail broke part of the glass facade at Mapletree Greater China Commercial Trust (MAGIC)'s Festival Walk mall in the ...
  March 31, 2014 - Bloomberg via Yahoo! Finance