The air pressure is the atmospheric air which presses down on planet. Meteorologists examine air pressure to predict weather conditions. Factors that change it are height and temperature. The fall of the temperature brings increase of air pressure. Changes of air pressure bring either hot or cold weather. For example, when we rise higher on the air balloon, pressure becomes lower. It happens, because air doesn’t press on the Earth very hard. Because of the changes in surface heating, air pressure differs according to the territory. Near the sea, there is more air than in the mountains, for example. That’s why the pressure would be higher here. As Miami is situated close to the sea, air pressure is usually high here. That’s why it is always sunny and warm here. Only once in history in 1977 abnormally cold arctic air came to the East and Centre of the USA. The high pressure cell pushed the mass of wind towards the south. Low pressure resulted in heavy snow with rain (The weather almanac, 2002). Air moving from areas with high pressure to those with low pressure causes the formation of winds.
Air pressure also influences the speed and strength of wind. It depends on the difference between low and high pressure. Thus, storms often occur in New York, and are usually investigated from the satellite. It represents high moisture concentration in the centre of low pressure (Gothamist, 2007). New York is an area of low pressure, which means regular rains and cloudy weather during the day. As a rule, weather forecasts are based on the fact that high pressure brings warm and dry weather, while low pressure causes cold, windy and wet conditions.