Lee Wave - Sailing

Sailing

Bermuda rigged sailing boats are vulnerable to lee waves. In the worst case lee waves appear behind high islands. For example, in the Adriatic Sea (Dalmatia) or the Aegean Sea (Greece) relatively small islands can be very high and have a good steady wind such as the Meltemi/Etesian in the Aegean during the dry summer season. The direction of the wind on the lee side of the island may be downwards, and this is feared because it causes instability in controlling the boat and in the worst case pushes the sail under water, which can lead to disastrous capsizing. This is not possible with ordinary winds, because the push of an ordinary wind in a sail disappears when the sail becomes horizontal. Many use the expression downburst for this extreme sailing weather condition, but it is certainly more related to lee waves.

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