information regarding the direction and the speed of wind with valid examples
Answers
Answer: When air develops pressure and begins to flow disturbing your hairstyle it is called wind
Types of Wind
1. Planetary Winds:
The winds blowing throughout the year from one latitude to another in response to latitudinal differences in air pressure are called “planetary or prevailing winds”. They involve large areas of the globe.
2. Trade Winds:
These are extremely steady winds blowing from sub-tropical high pressure areas (30°N and S) towards the equatorial low pressure belt. These winds should have blown from the north to south in Northern Hemisphere and south to north in Southern Hemisphere, but, they get deflected to the right in Northern Hemisphere and to the left in Southern Hemisphere due to Coriolis effect and Ferrel’s law. Thus, they blow as north eastern trades in Northern Hemisphere and south eastern trades in Southern Hemisphere.
3. The Westerlies:
These winds blow from sub tropical high pressure belts towards sub-polar low pressure belts. The westerlies of Southern Hemisphere are more stronger and constant in direction than Northern Hemisphere. These winds develop between 40° and 65°S latitudes and these latitudes are known as Roaring Forties, Furious Fifties and Shrieking Sixties.
4. Periodic Winds:
Periodic winds change their direction periodically with the change in season, e.g., Monsoons, Land and Sea Breezes, Mountain and Valley Breezes.
5. Local Winds:
The local difference in temperature and pressure causes local winds. It is of four types: hot, cold, convectional and slope.
explanation:
Air will move from areas of high pressure to low pressure approximately parallel to the isobars as these pressure regions drift. Counter clockwise around a low in the northern hemisphere and vise versa in the southern hemisphere. As this air motion moves with pressure regions, it will mechanically interact with the local landscape and the weather processes.
The difference of pressure determines wind speed and direction. Air flow from high to low pressure; it makes sense.
What determines wind speed and direction?
Warm air rises and cold air sinks because denser. If it wasn’t for the Coriolis effect, the tropical rising air would move to the cold poles before sinking. But the Coriolis spins to the right-hand side any displacement in the northern hemisphere.
It causes a clockwise wind around a high pressure but an anti-clockwise wind around a low pressure. The reason is that, a low pressure is much more intense and as the gradient force combines with the Coriolis, it forms what we call, the geostrophic wind; anti-clockwise around the center of the low pressure, in the northern hemisphere.
On the ground, that wind is affected by the drag of the terrain. This is called, the Buys-Ballot law. Seafarers have a saying about it. It says: If you are standing with the wind from behind and see the clouds coming from the left-hand side, a low pressure moves towards you and you can expect an increasing wind.
Having sailed all my life I will add: Yes but you can’t see the direction of the clouds in a moving platform that a small vessel is. Try it when on land, before departure!