Quick answer
Use official marine forecasts and radar, note predicted wind strength, wind change, swell and wave height, visibility and any warnings; then match those conditions against your boat’s capability, your crew’s experience and the local area (shorelines, tides, channels). If the forecast suggests conditions you or your boat aren’t comfortable with, don’t go.
Practical checklist (use before leaving the dock)
- Check the Bureau of Meteorology (BOM) marine forecast for your specific zone and the short-term radar/observations: BOM Marine and MetEye.
- Look at current conditions and trends: recent observations, radar for rain/squalls, and satellite for cloud cover.
- Note wind direction, average speed and gusts, plus any expected wind shifts or fronts that will cross your area.
- Check wave and swell height and period — short, steep seas feel much rougher than long, rolling swell of the same height.
- Look for warnings: gale, strong wind, severe thunderstorm, flash-flood, or local harbour advisories. If any apply to your area, give them full weight.
Why this matters
Weather forecasts give you the probable conditions, but your decision is a judgement call: a forecasted 20–25 kt wind might be easy for a well-sailed, heavy displacement cruiser but uncomfortable or dangerous for a light dinghy or inexperienced crew. Sudden wind shifts, squalls or short steep waves increase risk even when average numbers look acceptable.
Common mistakes to avoid
- Relying on a single source or a general land forecast instead of the marine forecast for your exact zone.
- Ignoring gusts and wind changes; a steady breeze is very different from frequent gusts or a swinging wind.
- Underestimating the effect of local features (heads, channels, reefs, sea-breezes and katabatic winds from hills) which can amplify wind and waves.
- Forgetting the return trip: conditions can change; plan conservatively so you aren’t trying to beat a change back to harbour.
Useful tools and where to look
- Official forecasts and warnings: BOM Marine and BOM MetEye.
- Short‑term radar and lightning: the BOM radar pages for your area.
- High-resolution visualization of winds and swell: services like Windy or the BOM charts; these help visualise fronts and wind fields.
One practical next step
Before you leave, spend five minutes: open the BOM marine forecast for your exact zone, check the latest observations or radar, and ask your crew if everyone is happy with the predicted conditions. If anyone feels exposed or the forecast has warnings or rapidly changing winds, postpone or choose a more sheltered plan.
Note: for the latest and location‑specific warnings and observations always consult the official BOM pages and local harbour authorities — this answer does not replace those sources.