Weather at sea by Houghton David 1928-;Sanders Frederick 1923- & Sanders Frederick 1923-

Author:Houghton, David, 1928-;Sanders, Frederick, 1923- & Sanders, Frederick, 1923-
Language: eng
Format: epub
Tags: Marine meteorology
Publisher: Camden, ME : International Marine Pub. Co.
Published: 1988-06-15T00:00:00+00:00

sea, at least five miles from land, and the wind is lighter than it should be, it is advisable to sail on port tack (or jibe) until you find the stronger wind. Having found it, change to starboard tack to stay in the stronger wind as long as possible.

Figure 10.1.

Figure 10.2.

Geostrophic win

Surface wind

Bands move to left

106 Weather at Sea

If the geostrophic wind is less than about ten knots the bands tend to deform, and sometimes large (five to ten miles across) eddies appear in the wind. Don't throw the weather forecast overboard in disgust. It cannot include this sort of detail. Look for a return to the original wind within an hour or two.

Changes in

water temperature

A sudden change in water temperature of a few degrees is almost as significant as a coastline in influencing the wind. Over colder water the surface air will be cooled and become more stable; there will therefore be less vertical mixing and friction will cause the wind to back and slow down. Over warmer water the surface air will be heated and become less stable, there will be more vertical mixing, and the effect of friction will be more easily overcome, so the wind will be stronger and more veered.

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