Quimbra Wave

A wind speed on its own says little about what the water will actually feel like. This tool takes a wind speed and turns it into the whole picture — the force, the state of the sea, the height of what you will be crossing, and a plain verdict for the craft you actually plan to take out. It begins with a slider. Drag it to the wind speed you expect, and everything else updates as you move: the Beaufort force, a written description of how the sea behaves at that force, the significant wave height and the maximum wave height you could realistically meet. Two further controls shape the reading. A gust toggle accounts for wind that does not hold steady, and a water exposure setting distinguishes a sheltered stretch from open water, because the same wind builds very differently depending on how much room it has to work with. Units stop being an obstacle. Whatever figure you start from, the reading appears simultaneously in knots, metres per second, kilometres per hour and miles per hour, so a forecast quoted one way and a limit written another no longer need converting in your head. All four equivalents sit together, which makes it straightforward to compare a marine forecast with a land-based one, or to talk through conditions with someone who thinks in different units from you. The comfort reading puts the numbers in context. Rather than leaving you to interpret a force rating, the tool weighs the conditions against your vessel and describes them as comfortable, choppy or rough for that craft. A craft that shrugs off a moderate chop and one that does not have no business sharing the same threshold, and the verdict reflects that difference instead of flattening it. Any reading worth keeping can be given a name and filed into a crossing log. Over time that log becomes a record of what you have actually been out in. It totals your crossings by condition — comfortable, choppy and rough — and holds on to the roughest crossing you have logged, which is a more honest measure of your experience than memory tends to be. It also makes patterns visible: whether you consistently turn back at the same force, or whether the conditions you call moderate have quietly been getting stronger. The approach throughout is to show the working rather than hand down a single figure. You can see the force, the sea description and both wave heights at once, adjust gusts or exposure, and watch how sensitive the outcome is to each. It is an estimate from wind speed alone, meant to sit alongside the official marine forecast rather than replace it. That is useful for thinking through a specific crossing, and just as useful for building an instinct for what a given wind speed really means on the water. Suited to kayakers, dinghy sailors, paddleboarders, small-boat owners and anyone who has stood at a slipway trying to work out whether a forecast in knots describes a pleasant afternoon or a long one.

Quimbra Wave