Tropical Cyclone Narelle.

Even though cyclones are a familiar part of life across northern Australia, they’re still one of nature’s most powerful and fascinating systems.

Cyclones don’t just “appear” — they build step by step. They begin over warm ocean waters (usually above 26–27°C), where heat and moisture rise into the atmosphere. As this warm air lifts, it leaves behind an area of low pressure at the ocean’s surface. Air from surrounding areas rushes in to fill that gap… and that’s where things start to spin.

Here’s the interesting part:

Because of the Earth’s rotation — known as the Coriolis effect — the incoming air doesn’t move in a straight line. It curves, causing the system to rotate.

In the Southern Hemisphere (like around Groote Eylandt), cyclones spin clockwise.

In the Northern Hemisphere, they spin anticlockwise.

As more warm, moist air rises, the system feeds itself — growing stronger, tighter, and more organised. At the centre is the eye, a surprisingly calm zone surrounded by the most intense winds and rain in the eyewall.

Another key driver is pressure.

Cyclones are essentially giant low-pressure systems. The lower the central pressure drops, the stronger the cyclone becomes. That pressure difference is what pulls in more air, accelerating wind speeds and intensifying the storm.

 And here’s why coastal areas pay close attention:

Cyclones don’t just bring wind and rain — they can push ocean water inland in what’s called a storm surge, often causing more damage than the winds themselves.

Living in the north, these systems are part of the seasonal rhythm. But understanding how they form gives a new respect for just how much energy is moving through the atmosphere above us.

 As Tropical Cyclone Narelle passed north of Groote Eylandt on the weekend, one thing became clear once again — when the storm rolls in, radio steps up. Our own Percy Bishop stayed on-air for more than 24 hours, keeping the community informed, entertained and up to date with emergency information.

The story didn’t go unnoticed, with ABC Darwin and other news outlets picking up on the effort — a powerful reminder that in remote communities, radio isn’t old technology… it’s essential.