Weather is the state of the atmosphere, to the degree that it is hot or cold, wet or dry, calm or stormy, clear or cloudy.
Cause of difference in Weather
- Weather occurs primarily due to air pressure (temperature and moisture) differences between one place to another. These differences can occur due to the sun angle at any particular spot, which varies by latitude from the tropics. In other words, the farther from the tropics one lies, the lower the sun angle is which causes those locations to be cooler due to the indirect sunlight.
Causes of Seasons
- Weather systems in the tropics are caused by different processes. Since the Earth's axis is tilted relative to its orbital plane, sunlight is incident at different angles at different times of the year. In June the Northern Hemisphere is tilted towards the sun, so at any given Northern Hemisphere latitude sunlight falls more directly on that spot than in December .This effect causes seasons.
Different Weather Disturbances
- A weather disturbance is a term used to describe a change in atmospheric conditions or weather patterns.
- According to the World Meteorological Organization, the different weather disturbances are tropical cyclones, intense tropical cyclones, low-pressure areas, very intense tropical cyclones, tropical waves, tropical disturbances, tropical depressions and zones of disturbed weather.
- Weather Disturbances are also referred to as natural disasters, as they are capable of wreaking havoc on roads, power lines and buildings.
Jet Stream and Tropical cyclones
- The strong temperature contrast between polar and tropical air gives rise to the jet stream. Instabilities of the jet stream flow in the mid-latitudes cause extra tropical cyclones.
- Tropical cyclones are classified as tropical storms, tropical depressions and typhoons.
- When a tropical cyclone occurs in the part of the Northwest Pacific Ocean that is west of the dateline and reaches wind speeds of at least 74 mph, it is called a typhoon.
- If a tropical cyclone of that intensity occurs in the North Atlantic, in the Northeast Pacific east of the dateline or the South Pacific east of the 160th meridian east, it is called a hurricane.
- In some cases, weather disturbances may cause severe weather conditions. Tropical cyclones tend to produce strong winds and heavy rainfall that may cause flash flooding.
Thunderstorms, which kill more people than hurricanes and tornadoes, produce thunder, lightning and sometimes hail. Violent storms such as tornadoes and hurricanes are equally destructive.