'Mass Devastation' Predicted In Super Storms Florence and Mangkhut

"Catastrophic" conditions expected in the U.S. and Asia

Mass devastation is expected for millions of people as Hurricane Florence and Super Typhoon Mangkhut make landfall in the U.S. and Asia in the coming days.

ten daily spoke to Ten Eyewitness News' weather expert Josh Holt on what those in the firing line can expect.

Hurricane Florence

Hurricane Florence is currently hitting the east coast of the United States. Despite being downgraded to a Category Two storm, the threat to the Carolina States is still immense.

Two factors will come into play when Florence hits that will make it incredibly dangerous, Holt said.

Neighborhoods are empty of residents as the effects of Hurricane Florence begin to bear down Atlantic Beach (Photo by Chip Somodevilla/Getty Images)

The first factor is the "catastrophic" flash flooding that will come as Florence is expected to hover over North and South Carolina for some time.

"The storm will hover for a pro-longed period of time, and will dump a significant amount of rain, 800 millimetres of rain is expected," he told ten daily.

The second factor that will make Florence potentially deadly is the risk of storm surges.

"The way Florence is spinning, storm surges could be around four metres higher than normal sea level," said Holt.

Waves crash underneath the Oceana Pier as the outer bands of Hurricane Florence being to affect the coast in Atlantic Beach, United States (Photo by Chip Somodevilla/Getty Images)

Unlike hurricanes that head inwards on land and become less powerful without a water mass to feed them, Florence will linger along the coast, meaning it is not expected to lose its ferocity for some time as it moves south-east.

Super Typhoon Mangkhut

Super Typhoon Mangkhut is expected to hit the Philippines on Saturday, and is the strongest typhoon in the west Pacific this season.

Widespread and significant damage will be caused by strong generated winds, Holt said.

"While it's hard to gauge the winds while it is over water, the winds near the core are well over 300 kilometres per hour," he said.

Philippine President Rodrigo Duterte is briefed on Magkhut while visiting the National Disaster Risk Reduction and Management Council (NDRRMC) Operations Center in Manila (Photo credit should read NOEL CELIS/AFP/Getty Images)

The north of the Philippines is expected to feel the full force of Mangkhut, but could possibly weaken as it heads towards South China and Hong Kong.

Even so, Holt said widespread flash flooding can be expected as it moves into those areas on Sunday and Monday.