Monday, December 10, 2012

Weather around the world


Weather is changed daily, because of many different elements. These elements are; solar radiation, pressure systems, ocean currents, and topography. These all can have a very big impact on the weather of an area and can change a day from sunny and dry, to a stormy and humid day. Knowing how all of these work is very important when planing on what you are going to do that day. 

Solar radiation causes the earth's surface to heat up or cool down, thus deciding how cool or how warm it will be that day. Solar radiation heats the air, this determines its stability, which affects cloud development and precipitation. Unequal heating of the earth's surface creates pressure gradients that result in wind. Almost all of the characteristics of climate are related to solar radiation.

Pressure systems have a direct impact on the precipitation characteristics of different climate regions. In general, places dominated by low pressure tend to be moist, while those dominated by high pressure are dry. Climates located at a low latitude get a very large period of wet weather from the Intertropical convergence zone and a dry period when the subtropical high moves into this region.

Ocean Currents are caused by air masses moving across an ocean. Climates boarding cold currents tend to be drier because the cool ocean water helps keep the air stable.  Air traveling over cold ocean currents lose energy to water and, therefore, the temperature along the coast is controlled.    

Topography causes an air mass to become more controlled, using the land shape. Windward slopes, those facing into the wind, get more precipitation due to orographic uplift of the air. Leeward sides of mountains are in the rain shadow, therefore, they receive less precipitation. Air temperatures are affected by slope and orientation as slopes facing into the sun will be warmer than those facing away. Temperature also decreases as one moves toward higher elevations. 

These are all sizable reasons that weather can change quickly, or over a period of time. Everything ends up effecting the air mass, which is the basic climate of an area. Solar radiation, pressure systems, ocean currents, and topography change over time, thus causing the air mass itself to change. knowing how most of these work will definitely help you plan out your day. 

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