As we are well aware, the earth is spinning and the Coriolis effect causes air to be deflected to the right in the northern hemisphere. Buys-Ballot told us that pressure is lower to the left when standing back to the wind. These diagrams show how the sea breeze forms and how the sea breeze front creates convection. The convective cloud is a result of the sea breeze dynamics.
At dawn, pressure is uniform over a wide area. At a height of, around m, the pressure will also be uniform. The sun heats the ground which then heats the lowest levels of the air.
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The air expands. Above the m level there is now a greater mass of air exerting a greater pressure. The pressure gradient created at m leads to a flow of air at that level from land to sea. This reduces the weight of air above the land and increases the weight of air over the sea. The result is a flow of air at sea level from sea to land. Continued heating of the land keeps the sea breeze going and spreading further and further inland. The air coming off the sea is cooler and moister than the air over the land.
This difference is often referred to as a "sea breeze front". The ascent of air at this front creates a line of cumulus cloud.
This moves inland during the day. With a fairly low lying coast, the sea breeze usually sets in straight onto the coast. Shortly after setting in, it then veers due to Coriolis over a period of a couple of hours or so. We had a very marked example of this along the east coast of Italy between Vieste and Brindisi, see below. In settled weather with a high pressure area to the north, the night wind is off the land.
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During the morning, heating of the land starts up the sea breeze more or less in an opposite direction to the night time land breeze. This causes a weakening of the offshore wind.
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Maybe a reversal. The name Vent Solaire used by many sailors is, in fact, a misnomer.
The sea breeze then becomes northwest and strengthens. But, as the land cools in the late afternoon and evening the sea breeze effect weakens and the wind reverts to the northwest around the high to the north. During the night the cooling land and the channelling effect of the Vilaine valley funnel the offshore wind and increases it to a good force 4 or so.
See below. Someone deterred by the sea breeze from anchoring to the west of Houat might seek shelter on the eastern side only to have a disturbed night in the land breeze. The western side would have been better after the sea breeze died away! Airmont, Soft cover. Softback, First Edition of this Edition. Published by Junior Deluxe Editions About this Item: Junior Deluxe Editions, Published by E. About this Item: E.
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Yet, he is brought only to a shadow of the real country at the back of the North Wind. The real country is open for him only after his death. At the end of the book, Diamond dies, finally able to see the country. Copy and paste this code into your Wikipedia page. Need help? Last edited by ImportBot.
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