While we have to fill air into the bicycle tube to keep it tight. Also, you know that a bicycle tube overfilled with air may burst. This experiences tell us that the air exerts pressure.
Due to the air exerts pressure that the leaves of trees, banners, or flags flutter when the wind is blowing. The pressure of air inside the can decreases than the pressure exerted by the air from outside the can.
The increased wind speed is, indeed, accompanied by a reduced air pressure.
As we have already leant that when air moves, it is called wind. Air moves from the region where the air pressure is high to the region where the pressure is low. The greater the difference in pressure, the faster the air moves.
The warm air is, therefore, lighter than the cold air. That is the reason that the smoke goes up. In nature there are several situations, where warm air rises at a place. The air pressure at that place is lowered. The cold air from the surrounding areas rushes in to fill its place.
The word monsoon is derived from the Arabic word ‘mausam’, which means ‘season’.
The winds from the oceans carry water and bring rain. It is a part of the water cycle.
The monsoon winds carry water and it rains.
In nature itself there are certain situations that can sometimes create disasters and pose threat to humans, animals and plant life.
The swift movement of the falling water droplets along with the rising air create lightning and sound. It is this event that we call a thunderstorm.
The air tends to rise and causes a drop in pressure. More air rushes to the centre of the storm and cycle is repeated the formation of a very low-pressure system with very high-speed winds revolving around it. It is this weather condition that we call a cyclone.
Factors like wind speed, wind direction, temperature and humidity contribute to the development of cyclones.
Cyclones can be very destructive. Strong winds push water towards the shore even if the storm is hundred s of kilometres away. These are the first indications of an approaching cyclone.
The water waves produced by the wind are so powerful that a person cannot overcome them. The low pressure in the eye lifts water surface in the centre. The rising water may be as high as 3−12 metres. It appears like a water-wall moving towards the shore. As a result, the seawater enters the low-lying coastal areas, causing severe loss of life and property. It also reduces the fertility of the soil.
There are various way of safety Measurements here:-
A cyclone forecast and warning service.
Rapid communication of warnings to the Government agencies, the ports, fishermen, ships and to the general public.
Some other precautions, if you are staying in a cyclone hit area −
Do not drink water that could be contaminated. Always store drinking water for emergencies.
Do not touch wet switches and fallen power lines.
Do not go out just for the sake of fun.
Do not pressurise the rescue force by making undue demands.
Cooperate and help your neighbours and friends.
These days we are better protected. Thanks to satellites and radars, a Cyclone alert or Cyclone watch is issued 48 hours in advance of any expected storm and a Cyclone warning is issued 24 hrs in advance. The message is broadcast every hour or half hour when a cyclone is nearer the coast.
Several national and international organisations cooperate to monitor the cyclone-related disasters.