Wind in the weather  – a movement of air, characterized by the known velocity. At a speed of 2.8 meters per second is sufficient to ensure that could move a sailing ship at sea. At speeds above 24 meters per second wind becomes a storm. In addition to wind speed is characterized by its strength, that is, pressures them per unit area. Original cause of air movement are the temperature difference of adjacent areas and uneven due to the pressure of the air, the barometric pressure. Air from the high pressure tends to the low, but due to the rotational motion of the earth undergoes a deviation, in the northern hemisphere to the right, to the south to the left (the law of Base points). Wind strength depends on the difference in barometric pressure at two points separated by unit distance, or gradient, which is usually expressed in millimeters of pressure on the degrees (meridian km.). Wind direction is denoted by the country of light, whence it blows. Usually distinguish between the 8 directions, or bearings: N – north, north, E – east, east, S – south, south, W – west, west, and NE – North-East, SE – south-east, SW – south-west NW – north-west. Wind direction is determined by the instrumentation of various devices (weathercocks) speed – anemometer. Speed ​​is denoted by the number of meters per second or kilometers per hour, for short – marks from 0 (calm) to 12 (hurricane) in the so-called Bofortovoy scale scores. Due to uneven heating and cooling during the day and night land surface and water is the constant change of coastal winds (breeze) at night from land to sea at night, in the opposite direction.

Dry southerly winds in the Alps called hairdryer scorching blowing from the deserts of Asia and Africa. Sandstorm – dry, dry wind from the desert to stony Arabia, Syria and Mesopotamia. In Egypt it is called Shamsin . Blows in June, July and August, a few hours a day, carries a lot of fine sand and ash, the temperature reaches 40 ° C and above. It is very harmful to people and animals.

Constant winds in the tropics – Trade winds and monsoons. Trade winds – it winds blowing between the tropics year-round, in the northern hemisphere from the north-east, the south from the southeast., Separated from each other by a strip of calm. With the highest accuracy are blowing on the oceans, on the mainland and coastal seas, are modified under the influence of local conditions. The reason for the Passat is the effect of the daily rotation of the earth and the solar heat. Monsoons – seasonal winds or blowing from opposite directions in summer and winter. In the Indian Ocean: in winter the north-east, the summer southwest monsoon. In the north of Australia and the Malay Archipelago during the summer monsoons blow (in the southern hemisphere – our winter) from the northwest, in the winter from the south-east – African Monsoon on the entire African continent, between 5-17 ° north width, between the Atlantic Ocean and the Red Sea : summer – from the southwest in the winter – from the northeast.