By: A. Smith
An anemometer is an instrument which measures wind. They come in two main types, those which measure wind speed and those which measure wind pressure. Many anemometers also show wind direction. Wind speed and direction are part of the data collected by weather stations to...
Lightning conductors and thunderclouds
By: Laura S.
Most of us are in awe of lightning. We often sit by the window and watch, as lightning dances across the heaven. But it isnt until the thunder and lightning happen simultaneously that we begin to appreciate the power of our world's electrical forces. Even...
By: A. Smith
In the 8 hours prior to and during the opening ceremony of the 2008 Summer Olympics, the Beijing Municipal Meteorological Bureau shot 1,104 rockets into the air to prevent rain during the ceremony. Rain was forecast, the humidity was 90%, and Beijing usually receives...
By: Jane Allyson
Put very simply: Clouds are formed from condensed water or ice. This occurs when the rising and expanding air cools enough to allow a proportion of the water vapour molecules to "stick" together, which then condense to form visible cloud droplets or ice crystals.The...
By: Perry McCarney
Thunderstorms are fairly frequent meteorological events. Brilliantly illuminating darkened skies with the flash of lightning and shaking our windows with the subsequent thunder. Frequent squalls of heavy rain inundate the land below them. But on rare occasions in winter, instead of raindrops, thunderstorms drop snow...
Lightning conductors and thunderclouds
By: A. Smith
A lightning conductor (United Kingdom) or lightning rod (United States) protects a building from lightning. It is designed to be struck instead of the building, so that it can channel the lightning safely down to the ground. Because the rod does not itself draw the...
The effects of sunlight on our lives
By: Cynthia Wall
Earth is a perfect planet. It has an atmosphere with the perfect mix of oxygen, nitrogen and other gases to sustain life. It has a moon to control the ocean tides. Most important, it has a big bright sun to give life to all the...
By: A. Smith
Heat lightning is distant lightning without thunder or rain. It usually occurs when the weather is hot and muggy. For this reason, it is also sometimes called summer lightning.Heat lightning usually belongs to a storm which is too far away for the thunder to...
How clouds form
By: Perry McCarney
Clouds form when air with a relative humidity close to 100% cools. They are composed of that air and micro-droplets of liquid water, with either larger droplets of liquid water, centered around some type of solid particulate, or ice crystals, sometimes both. It is the...
By: A. Smith
Absolute humidity is the amount of water vapor in the air. Relative humidity measures the amount of water vapor in the air relative to the amount of water the air can hold. The lower the percentage, the drier the air. Very arid areas have single...

 

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