What is a tropical cyclone and what do all the categories mean?
Tropical cyclones get energy from very warm ocean water they sit above which needs to be at least 26.5C or higher to form.
Photo: The Solomon Islands Meteorological Service
Explainer - The South Pacific tropical cyclone season is due to start in November and will run until the last day of April.
On average there's nine each season and tropical cyclones can straddle either end of the season, as seen last year with Lola in October.
But what actually is a tropical cyclone and what do all the categories mean?
Here's everything you need to know.
What is a cyclone?
New Zealand's National Institute of Water and Atmospheric Research (NIWA) describes tropical cyclones as rotating storms, characterised by a low-pressure centre, strong winds, and thunderstorms that produce heavy rain.
NIWA meteoro...