Five vital checks from BOM

If you’re preparing to head out on the water this summer, check the Bureau’s round-the-clock forecast service for all Australian coastal waters.

There are five things to take note of when planning your Jet Skiing trip:
Warnings current for your area
Weather conditions affecting safe navigation and comfort
Wind conditions
Wave conditions
Tide times

1. Warnings current for your area

Warnings are the highest priority forecasts. They warn of potentially dangerous wind conditions expected during the next 24 hours. Winds of 26 knots or more indicate rough conditions for Jet Skis.

Type of warning   – Average wind speeds indicated
Strong wind   26 to 33 knots
Gale   34 to 47 knots
Storm force   48 to 63 knots
Hurricane   64 knots or more

2. Weather conditions affecting safe navigation and comfort

Our coastal water forecasts provide information about conditions that may affect safe Jet Skiing.

Take note of forecasts indicating reduced visibility from fog or rain, or risks to safety and comfort from thunderstorms, lightning or squall conditions.

Some forecasts will also include information on UV levels and the times of day to use sun protection.

3. Wind conditions

To plan your trip for the best conditions, look for forecast trends in wind speeds and shifts in wind direction over the day. Forecast winds are average wind speeds, with gusts being up to 40 per cent stronger.

4. Wave conditions

Also take note of swell and sea wave conditions and how your Ski reacts to short, sharp sea waves against longer and flatter, but more powerful, swell waves. Forecast waves are average wave heights, and you should be prepared to experience maximum waves of twice the average heights.

Swell waves don’t enter enclosed waterways, but do have a dramatic effect on entrances to these areas.

Enclosed waterways are affected by sea waves — waves produced by the wind blowing across the region. A sea height of half a metre may create enough chop to swamp a small Ski. For coastal waters, you need to consider swell and sea waves. Swell waves can be of considerable danger near reefs and breakwaters.

The combination of sea and swell heights indicates the wave conditions you may experience. But you can’t just add one to the other. For instance, a 2.5 metre swell and 2 metre seas results in wave conditions over 3.2 metres. See how to calculate combined sea and swell height.

5. Tide times

Knowing when high and low tide will occur is important for Jet Skis entering and exiting river entrances and crossing bars. The combination of an outgoing tidal flow or low tide can cause waves to become steeper than usual, making your Ski difficult to navigate.

The changing tide over the day can cover rock platforms or reefs at high tide, whilst exposing them and creating a hazard at low tide.

Fishing on rock platforms may become dangerous at high tide as waves start to wash over or break onto the rock platform.

Happy Jet Skiing from the Bureau of Meteorology!

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