What is Weather?
[[File:ParmaMelor AMO TMO 2009279 lrg.jpg|thumb|Weather]] '''Weather''' is the [[day]]-to-day or [[hour]]-to-hour change in the [[Atmosphere of Earth|atmosphere]]. Weather includes [[wind]], [[lightning]], [[storm]]s, [[hurricane]]s, [[tornado|tornadoe]]s, [[rain]], [[hail]], [[snow]], and lots more. [[Energy]] from the [[Sun]] affects the weather too. [[Climate]] tells us what kinds of weather usually happen in an area at different times of the year. Changes in weather can affect the [[mood|mood and life]] of many living things. People wear different [[Clothing|clothes]] and do different things in different weather conditions. They also choose different food in different seasons. [[Weather station]]s around the [[world]] measure different parts of weather. Ways to measure weather are [[wind]] [[speed]], [[wind]] [[direction]], [[temperature]] and [[humidity]]. People try to use these [[measurement]]s to make [[weather forecast]]<nowiki/>s for the future. These people are scientists that are called ''[[meteorology|meteorologists]]''. They use [[computer]]s to build large [[mathematical model]]s to follow weather trends. Severe weather can hurt people and their property. It can also just be a bother. Some examples of severe weather are: * [[Tropical cyclone]]s * [[Rainstorm]]s * [[Drought]] * [[Heat wave]]s * [[File:F5 tornado Elie Manitoba 2007.jpg|thumb|Tornado]][[Tornado]]es ==Causes of weather== Weather happens because different parts of the [[Earth]] get different amounts of [[heat]] from the [[Sun]]. This makes different [[climate]]s. 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 sky by [[convection]]. 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 sk