Dozens of flights and ferry services were cancelled, while several highways across the island were shut amid fears of landslides and floods.
A massive pro-democracy rally in downtown Hong Kong ended early after violence broke out, with police firing tear gas and a water cannon after protesters threw bricks and Molotov cocktails at government buildings.
The difficult relationship between two key US allies in Asia-Pacific has become a full-blown trade war, which is bound to have an impact on the global economy.
Taiwan's termination of relations with the Solomon Islands comes after the pacific nation's decision to switch diplomatic recognition to China. Taipei is accusing Beijing of using "dollar diplomacy" to buy off its few remaining allies.
China has already denounced the sale, one of the biggest yet by the United States to Taiwan, which Beijing considers a renegade province, warning of unspecified "countermeasures."
The one-China policy, mainly aimed at Taiwan, maintains that there is only one Chinese government, and it is a key diplomatic point accepted by most nations in the world, including the US.
The chair of the influential Foreign Affairs Committee has suggested giving Hong Kong citizens full nationality as a show of support, saying it should have happened in 1997.
China's ambassador to the United Kingdom said Beijing would use its power to quell Hong Kong protests if the situation deteriorates further.
The brands are the latest to get into hot water over political issues with Beijing, which has been more assertive in its territorial claims and how it expects foreign companies doing businesses in China to describe them.
The National Meteorological Centre warned that 24-hour rainfall levels across eastern China could reach around 250-320 millimetres from Friday afternoon to Saturday afternoon.
Beijing issues its first white paper since 2012 that gives rare insight into the world's largest army and China's military ambitions.
The multi-billion dollar deal has angered Beijing, which considers Taiwan to be its province.
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