|Weather is the
day-to-day or hour-to-hour change in the atmosphere. Weather
includes wind, lightning, storms, hurricanes, tornadoes, rain, hail,
snow, and lots more. Energy from the Sun affects the weather.
Climate tells us what kinds of weather usually happen in an area at
different times of the year. Changes in weather can affect our mood.
We wear different clothes and do different things in different
weather conditions. We choose different foods in different seasons,
like ice cream in the summer, or hot chocolate in the winter.
Weather stations around the world measure different parts of
weather. Ways to measure weather are wind speed, wind direction,
temperature, barometric pressure, and humidity. People try to use
these measurements to make weather forecasts for the future. These
people are scientists that are called meteorologists. They use
computers to build large mathematical models to follow weather
trends. Bad weather can hurt people and their property. It can
also just be a bother.
happens because different parts of the Earth get different amounts
of heat from the Sun. This makes different climates. The tropics get
the most heat because the Sun shines straight down on them, while
the poles get the least heat because the Sun shines on them from a
low angle. Warmer air is lighter than cooler air and rises higher in
The air always has some water mixed with it. This is called
humidity. When it cools, the water can change from a gas to a liquid
through condensation. Then the water can fall from the sky as rain
or snow. After the air rises, it gets colder and goes back towards
the ground. Because the air lost its water before, it is dry when it
comes back to the ground. Wind is made when two areas of air of
different temperatures meet. This is called a warm front or cold
front. The hot air is forced to rise over the cold causing
condensation which forms rain. The ways that the air moves around
the Earth are called atmospheric circulation.