Mangkhut has weakened since blasting into the Philippine coast on Saturday, but was packing sustained winds of 175 kilometres per hour (110 miles per hour) as it hurtled toward China's heavily populated southern coast. This means that heavy rain has fallen or is expected to fall generally over Hong Kong, exceeding 50mm in an hour, and is likely to continue.
The government and casinos are taking extra precautions after Macau was battered by Typhoon Hato past year, which left 12 dead.
"The suspension of gaming operations is for the safety of casino employees, visitors to the city, and residents", the Macau government said in a statement.
Shop windows were taped up and the normally traffic-clogged streets were deserted as the storm drew nearer. In the Philippines, economic losses could reach 6.6 per cent of gross domestic product, or more than $20 billion, he said.
"I'm so anxious also nervous because of course they are our church members as well as our relatives, our families are there because according to them this is one of the strongest typhoon that visited the Ilocos Norte", Corpuz said.
Super Typhoon Mangkhut - the biggest storm of the year - smashed through the Philippines on Saturday, claiming its first victims as two women were killed when a rain-drenched hillside collapsed on them, while another person drowned in Taiwan.
Mangkhut's peak winds have been stronger than those of Hurricane Florence, which killed five people and halted power supply to more than 900,000 us homes and businesses in the Carolinas, before it was downgraded to a tropical storm.
Apart from Mangkhut, those include an impending food crisis and an inflationary upsurge which has hit the country's poorest families the hardest.
Storm chaser James Reynolds, who was in a hotel in Santa Ana, in Cagayan, when the storm hit, described how the winds ripped through the hotel's interior, leaving it uninhabitable.
While the state weather agency PAGASA downgraded the threat level, it also said storm surges and heavy rain could still cause widespread flooding and landslides.
Three more deaths have been reported in northeastern Cagayan province, where the typhoon made landfall.
Manila Electric Co. said 430,000 customers in the capital region and nearby provinces are without electricity.
The storm tore off roofs, felled trees, triggered 42 landslides and caused extensive flooding.
The storm caused almost 150 flights, a third of them worldwide, to be cancelled and sea travel to be halted.
Eva Air's Taipei-Hong Kong flights BR828, BR867, BR868, BR809, and BR810 are canceled for September 17.
Train, bus and ferry services to the airport were also suspended, though the airport remains open for passengers who have nowhere else to go. Residents in the low-lying area of Tai O on Lantau Island would be taken to temporary shelters on Saturday.
Flights from Hong Kong International Airport were delayed or canceled Sunday, disrupting the travel plans of thousands of passengers.
"According to the present forecast track, Mangkhut will be closest to the Pearl River Delta around noontime (local time)", the Hong Kong Observatory said.
Taiwan's EVA Air have canceled all flights to and from Guangzhou, Kong Kong, Macau and Shenzen. Philippines Airlines Inc. scrapped 41 Saturday flights, including those to Hangzhou and Tokyo, it said on Facebook.
Mangkhut could affect as many as 30.5 million people across Asia, according to the United Nations Global Disaster Alert and Coordination System.
Mangkhut, known locally as Ompong, has been described by the World Meteorological Organisation as the strongest tropical cyclone the world has faced so far this year.