What causes weather?

[Dr_metz_livs]

What causes weather?

[fo3nix]

firstly we have an atmosphere (unlike for example the Moon); to this we also spin round, and so get wind. To add to that we have heat from the sun, and water in the seas. the combination of these two create the water cycle, etc.

More to it than that (i'm sure others will point this out), but thats the essence of it.

[brachiopod]

Effectively, differential heating of the Earth, causing air of different temperatures, pressures and humidities to move and interact.

Either that, or I once heard Michael Fish had a lot to do with it.....

[mibn2cweus]

Given the difficulties of predicting it perhaps it would better be call 'whether'.

[brachiopod]

Or when a icy wind is blowing round your chilly regions, it should be called 'wither'.....

[Calvesy]

The amount of water that the air can hold (humidity) varies at different temperates, altitudes and pressures. Different surface and cloud features as well as angle of sunlight affect the way that air is heated, causing higher pressures to blow into lower pressures. The coriolis effect of the earth turning causes a region of low pressure to rotate faster the ground beneath it. If a volume of air loses pressure or temperature it may precipitate out moisture which we see as fog, rain or snow. This is why low pressures attract bad weather.

[lalalahead]

Clouds ARE in fact, the definition of weather, says my 6th grade science teacher. Here's how clouds form.
First off; clouds are condensed water vapor. Ok, so like, there is a process of evaporation. Evaporation is when water in lakes, rivers, puddles, ect., are heated up (from the natural heat) and then they are the particles of water that we actually BREATHE. Once the temperature drops (for example; if there is a LOW pressure center in the area) the particles that had evaporated are then turned into condensed water vapor. This process is called condensation. Once the clouds have a lot of condensed water vapor, it can't hold onto the particles any longer; resulting in precipitation. Precipitation is more commonly known as rain, snow, hail, and sleet. That is how those white, fluffy things turn up in the sky that we all share!