weather elements

Topics: Water, Fog, Weather Pages: 9 (2320 words) Published: October 8, 2014
“ Weather is the condition of the climate in a particular place at a particular time.”

The weather is all around us, all the time. It is an important part of our lives and one that we cannot control. Instead the weather often controls how and where we live, what we do, what we wear and what we eat. Someone who studies the weather is called a meteorologist. Weather predictions are made by forecasters who you see on television.


Weather is the day-to-day conditions of a particular place.
Climate is often spoken about at the same time as weather, but it is something quite different. The climate is the common, average weather conditions at a particular place over a long period of time (for example, more than 30 years). We learn about different climates around the world. Deserts have a hot and dry climate while the Antarctic has a very cold and dry climate. 

The earth’s atmosphere and air around us is always moving. Wind is simply moving air. Sometimes it moves slowly creating a gentle breeze. Other times it can move faster creating stronger, more powerful winds. We cannot see the wind, but we can see what it does to trees outside and kites on the beach. If you are outside on a windy day you can sometimes feel the wind on your face. It may be so windy that it is difficult to walk.Both the direction and speed of the wind should be measured for weather observations. WIND DIRECTION

One of the oldest pieces of equipment used to measure weather is a wind vane. This wind or weather vane is usually made from a strong material, (like metal) and placed above ground, usually on top of a building. The wind vane will show clearly the 4 principle directions of the compass: North, East, South and West, and have a moveable arm that can point in any direction. Once true north is known (using a compass), the wind direction can be found by looking at the direction the arm is pointing from. For example, air moving from east to west will create an easterly wind.  Another way to find out wind direction is by using a wind sock which you may have seen at airports or airfields. WIND SPEED

Wind speed can be measured in miles per hour, kilometres per hour and by knots. The wind force can be identified using the Beaufort scale, which divides wind speeds into 12 forces. Force 0 means calm, Force 4 is a moderate breeze; Force 8 is a gale, while the maximum is hurricane force 12. The wind speed is measured using an ANEMOMETER. Most weather stations measure wind speed using a spinning cup anemometer, which rotates depending on the wind. PRECIPITATION

Precipitation is the release of water from the atmosphere to the earth’s surface as a solid or liquid. It includes rain, snow, hail, sleet and dew.

rainfall is a very common type of weather. Rain starts above us when small droplets of water in the clouds join together until they get too big and heavy and fall from the clouds. However, different cloud types can produce different rainfall. Heavy rainfall after a hot summer day may fall from tall, large white, fluffy cumulonimbus clouds. Light rain, also known as drizzle, may fall from low, grey, layered cloud called stratus. It is useful to measure the amount of rainfall we have, as it provides an important source of water to reservoirs giving us drinking water. Rainfall is easy to measure by recording how much water collects in a rain gauge. The rain gauge is quite accurate as long as it is set up safely at ground level in an exposed place. The amount of rainfall collected in the gauge is measured in millimetres. Rainfall data can be used to work out monthly averages and make comparisons with previous years. SNOW

During the winter months when temperatures are cold, (at or close to 0º Celcius) snow will fall from clouds instead of rain. Snow starts off in the same way as rain, with tiny droplets of water...
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