Reading Ripples – Spotting Wind on the Thames
pmrsailing.uk blog
Ask any experienced sailor how they know a gust is coming, and they’ll likely point to the water. Learning to read the river’s surface is one of the most useful – and underrated – skills you can develop.
On the River Thames, where the wind shifts with every bend, hill, and tree line, spotting changes in the ripples can give you a crucial advantage over the fleet.
Why the Surface Tells the Story
Water doesn’t lie. When a gust is on its way, it touches the surface before it touches your sail.
A darker patch of water, small choppy patterns, or smooth flat water in a lull – each tells you something.
Being able to read these signals means you can:
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Hike before the gust hits
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Ease or trim sails in advance
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Prepare to tack or gybe smartly
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Avoid getting caught out mid-manoeuvre
What to Look For
1. Dark Patches of Water
These are usually signs of stronger wind approaching. The surface becomes textured and broken as the breeze ruffles it.
If you see a dark patch moving toward you – get ready.
2. Smooth, Glossy Areas
This is a lull. The wind has dropped or been blocked by trees or buildings. Prepare for a sudden change in speed or steering.
3. Ripples Moving at Angles
If ripples approach at a diagonal to your current heading, the wind direction is shifting. Anticipate a change in sail trim or course.
4. Sudden Gaps in Ripple Patterns
A sign that you're entering a dead patch. Keep your sails loose and your weight central until the wind picks up again.
Local Knowledge Is Everything
Certain parts of the Thames near Cookham, Bourne End, or around the tree-lined bends can funnel wind, or kill it completely.
Watch what happens to the ripples in these zones each time you sail. You’ll start building a mental map of where gusts lurk — and where calm patches steal your speed.
Practice on Shore Too
Even if you're on safety boat duty or watching from the bank, train your eyes.
Try spotting gusts travelling across the water. Predict when and where they’ll hit the sails. Then see who’s prepared… and who’s about to swim.
📖 Learn more tips for river sailing at: https://pmrsailing.uk
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