Why is it so windy some days and not windy at all other days?
2007-03-05 06:39:34 · 7 answers · asked by mirageoflove34 2 in Science & Mathematics ➔ Weather
Air in motion is called wind.It has both velocity and direction.The velocity is measured in knots or Km per hour or metres per second.The wind direction is measured in degrees from North through the East.The direction is always the direction from which the wind blows in meteorological convention.The wind at a place is seldom steady.Sometimes rapid fluctuations occur which are known as gusts and lulls.Gust is a sudden increase in wind speed and lull is the sudden decrease in wind speed.These gusts and lulls are caused by turbulance in the atmosphere.
The turbulance in turn is caused either by mechanical obstruction due to buildings or small hills or by a marked convection in the atmosphere.The former is called mechanical turbulance and the latter thermal turbulance.The turbulance is usually minimum in the night and morning and maximum in the afternoon and evening.Accordingly wind speed is more or less.These changes in a day is called diurnal variation of the wind.Coastal stations experience the well known diurnal variations in the form of sea-breeze and land-breeze.
When winds change in the clockwise direction they are said to veer.Change in the reverse direction is said to be backing.
Sometimes when there is a low pressure system over a place wind speed may increse with change in direction.
2007-03-06 01:16:31 · answer #1 · answered by Arasan 7 · 0⤊ 0⤋
Moving air. Pressure differences in the atmosphere.
Think of water in a bathtub. Pull the drainplug and the water starts to move. The water moves from a high pressure area, the bathtub, to a low pressure area, the drain. Air moves the same way between high and low pressure areas in the atmosphere.
2007-03-05 14:45:19 · answer #2 · answered by joe s 6 · 0⤊ 0⤋
Wind is the movement of air from higher pressure to lower pressure.
2007-03-05 14:44:30 · answer #3 · answered by tentofield 7 · 0⤊ 0⤋
Hi. Wind is air responding to pressure.
2007-03-05 14:43:37 · answer #4 · answered by Cirric 7 · 0⤊ 0⤋
Wind is the air motion relative to the earth's surface
2007-03-06 14:40:38 · answer #5 · answered by m_p_dicerbo 1 · 0⤊ 0⤋
It's caused by uneven heating of the earth. If it was cold yesterday and then mild today there will be some degree of wind.
2007-03-05 14:43:54 · answer #6 · answered by cotton~candy 4 · 0⤊ 0⤋
air is responding to pressure and temperature.
2007-03-05 15:07:27 · answer #7 · answered by Jonathan R 2 · 0⤊ 0⤋