Module 13 of 17
Meteorology
Shipping forecasts, Beaufort scale, weather systems, and broadcast meteorological information.
Weather and the Sailor
Weather is one of the most critical factors in safe seamanship. Wind strength and direction determine sailing conditions, sea state affects comfort and safety, and visibility impacts navigation. As a Day Skipper, you need to obtain, interpret, and act on weather forecasts before and during every passage.
Key Points
- Check the weather forecast BEFORE every passage
- Monitor conditions and forecasts throughout the passage
- Be prepared to change plans if weather deteriorates
The Beaufort Scale
The Beaufort Scale describes wind force from 0 (calm) to 12 (hurricane). It links wind speed to observed sea and land conditions. For Day Skipper purposes, the most relevant forces are: Force 1–3 (light to gentle breeze, pleasant sailing), Force 4–5 (moderate to fresh breeze, good sailing but choppy), Force 6 (strong breeze, reefing required, inexperienced crews should seek shelter), Force 7+ (near gale and above, most yachts should be in harbour).
Key Points
- Force 0: Calm (< 1 knot), sea like a mirror
- Force 3: Gentle breeze (7–10 kn), large wavelets
- Force 4: Moderate breeze (11–16 kn), small waves, whitecaps
- Force 5: Fresh breeze (17–21 kn), moderate waves, many whitecaps
- Force 6: Strong breeze (22–27 kn), large waves, spray. Reef sails.
- Force 7: Near gale (28–33 kn), sea heaps up. Seek shelter.
- Force 8+: Gale and above. Dangerous for small craft.
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