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A map showing the force of the mistral one day in November 2008. The wind reached a speed of 80 km/h (50 mph), with average speeds of more than 50 km/h (31 mph) near Marseille. The mistral takes place each time there is an anticyclone, or area of high pressure, in the Bay of Biscay, and an area of low pressure around the Gulf of Genoa.
He found the energy transfer from the wind to the water surface is proportional to the curvature of the velocity profile of the wind at the point where the mean wind speed is equal to the wave speed. Since the wind speed profile is logarithmic to the water surface, the curvature has a negative sign at this point. This relation shows the wind ...
A Wind generated current is a flow in a body of water that is generated by wind friction on its surface. Wind can generate surface currents on water bodies of any size. The depth and strength of the current depend on the wind strength and duration, and on friction and viscosity losses, [1] but are limited to about 400 m depth by the mechanism, and to lesser depths where the water is shallower. [2]
A short burst of high speed wind is termed a wind gust; one technical definition of a wind gust is: the maxima that exceed the lowest wind speed measured during a ten-minute time interval by 10 knots (19 km/h; 12 mph) for periods of seconds. A squall is an increase of the wind speed above a certain threshold, which lasts for a minute or more.
Wind setup, also known as wind effect or storm effect, refers to the rise in water level in seas, lakes, or other large bodies of water caused by winds pushing the water in a specific direction. As the wind moves across the water’s surface, it applies shear stress to the water, generating a wind-driven current.
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Mistral wind blowing near Marseille. In the center is the Chateau d'If. The winds of Provence, the region of southeast France along the Mediterranean from the Alps to the mouth of the Rhone River, are an important feature of Provençal life, and each one has a traditional local name, in the Provençal language.
It also reported the mean wind speed record of 131kmh (81mph) set in 1945 in Foynes has been broken during the storm, with up to 135kmh (84mph) at Mace Head at 04:00 local time. Thousands without ...