Satellite imagery can help determine the strength, size and cohesion of a storm. The stronger a storm becomes, the more likely an eye will form in the center. When the eye looks symmetrical, that often means the storm is not encountering anything to weaken it.

The unusual activity is "a lot to happen at once, but not unprecedented," an atmospheric science professor said.

It’s the first time in four years the feat has happened in the region, the limits of which start east of Australia and extend about 5,000 miles from the Coral Sea through the South Pacific Ocean. It last happened as the calendar flipped from January to February in 2021 when tropical cyclones Bina,