List of weather conditions

Smog is a layer of airborne pollution that forms a haze over cities. Sometimes pollution can be so thick that it is a health hazard to people breathing it.

When the weather is severe we call it a storm. During a storm there is usually strong wind, thunder and lightning, heavy rain or snow and sometimes hail.

A tornado is a kind of extreme weather where a thin, rotating column of air is created. Tornados can be seen all over the world but are most common in the United States. Tornados can be very dangerous, and can destroy houses and crops and kill farm animals.

Wind is just the large scale movement of air. Wind happens because some parts of the world get heated up more than others by the sun, and it makes the air there get bigger, so the air has to try and move somewhere it has more room. Where it is cold, the air gets smaller, so wind is always moving between places that are different temperatures. When it is very windy it is called a storm. Wind can be very dangerous, but it can also be turned into electricity using wind turbines or used for other purposes using windmills. There are lots of words that mean different kinds of wind, like breeze for a gentle wind, gust for a sudden burst of wind, or gale for a very strong wind.