Cairns International Airport turbulence forecast
Cairns, Australia
CNS (Cairns, Australia) sits at 16.89°S, 145.76°E, 10 ft elevation — coastal with the Great Dividing Range nearby.
About CNS
Major airport serving Cairns, Australia.
- Climate
- Tropical coastal — warm, humid, convective
- Nearby terrain
- Great Dividing Range
- Geography
- Coastal — marine-influenced airmass
What to expect on departures
Computed from CNS's geography and climate
At tropical latitude the jet stream is rarely directly overhead, so clear-air turbulence is less of a routine concern from CNS. Convective weather closer to the surface is the dominant turbulence source instead. The Great Dividing Range sit upwind of CNS on prevailing flow days, generating mountain-wave turbulence that can extend several hundred kilometres downwind at cruise level. The lee-wave risk is highest when June–August winds at FL300 cross the Great Dividing Range at near-perpendicular angles. Cairns's tropical climate means convective build-up is a year-round concern — afternoon and early-evening departures from CNS encounter the most cell activity. Morning slots and red-eye departures are typically the smoothest of the day.
Climbout notes
Standard Instrument Departures (SIDs) often route around terrain; on strong-wind days, low-level turbulence in the lee of the hills is common in the first few thousand feet.
Seasonal pattern
Convective turbulence cycles with the local wet/dry season rather than a strict calendar month — check regional rainy-season dates for the most accurate risk window. Mountain-wave activity near the Great Dividing Range peaks in the cold season when upper-level winds blow hardest across the range.
- Peak turbulence
- Regional wet season
- Typically calmest
- Regional dry season
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CNS turbulence FAQ
Is turbulence common on flights from CNS?
Cairns International Airport is best described as a mountain-wave sensitive airport. At tropical latitude the jet stream is rarely directly overhead, so clear-air turbulence is less of a routine concern from CNS.
When is turbulence worst for Cairns flights?
Convective turbulence cycles with the local wet/dry season rather than a strict calendar month — check regional rainy-season dates for the most accurate risk window. Peak turbulence window: Regional wet season. Typically calmest: Regional dry season.
Does the terrain around Cairns affect turbulence?
Yes — the Great Dividing Range lie close enough to generate mountain-wave turbulence on days with strong upper-level winds. These waves can propagate hundreds of kilometres downwind, so they sometimes affect cruise even after you've left the immediate area.
How accurate are Turbcast forecasts?
We combine live NOAA Aviation Weather Center data (PIREPs, SIGMETs, AIRMETs) with physics-based Ellrod and Richardson-number calculations derived from Open-Meteo pressure-level wind and temperature data. If a source is unavailable for a waypoint we show an em dash rather than invent a number.
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