The Weather Handbook by Alan Watts & Alan Watts

Author:Alan Watts & Alan Watts
Language: eng
Format: epub
ISBN: 9781472913883
Publisher: Bloomsbury Publishing
Published: 2014-06-13T04:00:00+00:00

As the sun gets high enough to be about 30° over the horizon it will, in spring and summer, have enough power to set off thermals. These parcels of warm air will be inhibited from rising too far by the inversion but eventually they will have enough strength to burst through the inversion and break it up. The first signs of this happening are when hill slopes in the direct sun grow some puffs of cumulus cloud.

The break-up of the inversion allows the stronger wind above to be brought down and mixed with the slow surface wind. The effect is a sudden increase in the wind and often a change of direction as well. The latter is usually a veer. The wind will now strengthen and should continue to do so all the way through the morning and into the early afternoon. The morning wind will however be the most variable of the day and if sailing you may be treated to some strange direction shifts and sudden puffs. As the wind strengthens towards its afternoon maximum speed so the scale of these variations will decrease. The wind will be stronger but the shifts within it will seem less noticeable.

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