Packing winds of nearly 290km/h (180mph) and gusts of 350km/h, Bavi is moving over the Pacific islands, according to the US National Weather Service (NWS). BBC reported.
The NWS warned the "very dangerous" storm could cause "catastrophic" damage, with waves potentially nearly 11m (35ft) high. An official told AFP they had received reports of "major damages" on the Northern Mariana Islands.
The western Pacific region is particularly prone to tropical cyclones. While storms of this strength are unusual for the US islands, scientists say climate change is making powerful typhoons more common.
Residents in the region have been moving to emergency shelters and making last-minute preparations before the arrival of the super typhoon.
In the Northern Mariana Islands, Rota - the southernmost inhabited island, about 50km north-east of Guam - is taking a direct hit, according to the NWS.
The mayor's office has published an advisory urging residents to prepare for "destructive winds", adding that "conditions are expected to deteriorate rapidly, making it unsafe to be outdoors".
"We are hanging in there. We are experiencing heavy winds and flooding," a spokesperson for Rota's mayor told AFP, adding that some people had reported "major damages".
On Saipan, north of Rota, wind gusts of more than 161km/h (100 mph) were recorded at the airport, meteorologist Marcus Landon Aydlett told the Associated Press.
