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Wind direction is reported by the direction from which it originates. For example, a northerly The way a weather vane is pointed by prevailing winds indicates the direction from which the wind is blowing. that the wind is blowing from; its tail, with the smaller opening, points in the same direction as the wind is blowing. Using isobars on weather maps is completely accurate. Wind derives its initial speed and direction from changes in air pressure over distance. Weather is the day-to-day fluctuation of temperature, moisture and wind currents. The Four Forces That Influence Wind Speed & Wind Direction Wind, in its interdependent relationship with the other cycles of the Earth, like.
The weight of the acrobat on top puts more pressure on the one below. Then another acrobat climbs up and stands on the second acrobat's shoulders.
Now there's even more pressure on the acrobat on the bottom because he is under the weight of the two acrobats above him. It's the same with air. Yes, air has weight, and probably more than you think. In fact, the weight of the air on your desk at school weighs about 11, pounds.
- Wind direction
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That's about the same weight as a school bus! Since air pressure pushes in all directions, the air pressure pushing up from under your desk balances out the air pushing down on it, so the desk doesn't collapse under the weight.
Wind Speed and Direction
Just like an acrobat with two people stacked on his shoulders would want to move to where there wasn't so much pressure on him, air moves from areas where the pressure is higher to where it is lower. What causes Air Pressure? Air pressure depends on the density of the air, or how close together its molecules are.
You know that a hard rubber ball is more dense than a Styrofoam ball and that ice cream is more dense than whipped cream. Air lower in the atmosphere is more dense than air above, so air pressure down low is greater than air pressure higher up. Remember those acrobats; there's a lot more pressure on the one on bottom than on the one on top. Temperature also makes changes in air pressure. Sciencing Video Vault Wind Belts and Wind Direction Simply put, the direction of wind flow associated with wind belt zones flows from the direction indicated within its name.
Weather Elements that Affect Fire Behavior
The northeast trade winds flow from northeast to southwest. The southeast trade winds flow from the southeast to the northwest.
The Coriolis Effect If it were not for the Earth's rotation, the winds would simply flow in relatively straight paths from north to south or from south to north respectively.
But the Earth does rotate, and as a result the winds are deflected to the right in the northern hemisphere and to the left in the southern hemisphere. This effect is known as the Coriolis effect and adds greatly to the atmospheric airflow mixture and weather variability.
Sea and Canyon Breezes Localized winds like those found along a coastline are created by similar forces. As the sun rises, the water and the land absorb the sun's heat at different rates. As a result, high and low pressure systems are created. In the morning, the land will heat up faster than the water.
As the land heats up it, radiates heats to the surrounding area.
Wind & Air Pressure
Hot air is less dense than cold air, so the warming air begins to rise, pulling the cooler air over the water inland. As the heated air rises, it begins to cool, flowing out to sea until it grows cold and dense and falls. This cycle reverses as the day closes and sun begins to set. Not only does the land warm faster but it also cools faster than does water. As a result, the circle of air flow reverses as the warmer air above the water flows toward the cooler air above the land.