Hong Kong woke this morning to the first T8 signal of the year, which closed schools, suspended trading and led to dozens of flight cancellations.
Gusts of up to 166km/h were recorded by the Hong Kong Observatory as Typhoon Kalmaegi passed Hong Kong on its way towards Guangdong and Hainan Island.
The T8 remained on Tuesday morning and was lowered to T3 at 10.40 am.
Classes were suspended at schools all day, according to Education Bureau.
The MTR was running limited frequency rail services on its lines, with trains running every 10 to 20 minutes.
The government said it had received 44 reports of fallen trees, while the Drainage Service Department received four reports of flooding, in Eastern District, Kwun Tong, North District and Islands District.
“It is expected that local winds will moderate later in the morning,” said the Observatory.
"Although Kalmaegi is moving gradually away, its associated squally showers will affect Hong Kong intermittently."
A total of 39 flights in and out of Hong Kong Airport had been cancelled and more than 500 delayed as of 6am.
Trading was suspended for the morning session.
Eleven men and six women had sought hospital treatment for typhoon-related injuries, the Hospital Authority said.
The Observatory raised the T8 tropical cyclone signal at 10.30pm on Monday, after a day that began with a very hot weather warning quickly deteriorated as the fast-moving storm neared Hong Kong.