Tag: precautions for natural disasters

The naming of cyclones in the North Indian Ocean is a collaborative effort by the member countries of the WMO/ESCAP Panel on Tropical Cyclones, which includes India, Sri Lanka, Bangladesh, and others.

Water Spout is a phenomenon that results in the formation of vertical water funnel at sea. A rotating column of water and spray formed by a whirlwind occurring over the sea or other body of water.

Since sea surface temperatures and humidity both directly correlate with chances of cyclone formation, the Bay of Bengal is a more likely target because it gets higher rainfall, and because the sluggish winds around it keep temperatures relatively high: about 28 degrees around the year. Warm air currents enhance this surface temperature and aid the formation of cyclones.

In addition, the Bay receives higher rainfall and constant inflow of freshwater from the Ganga and Brahmaputra rivers. This means that the Bay’s surface water keeps getting refreshed, making it impossible for the warm water to mix with the cooler water below, making it ideal for depression. 

Western disturbances are extratropical storms originating in the Mediterranean region that bring winter rainfall to the northwestern parts of India, particularly Punjab, Haryana, and Rajasthan.

Cyclone and anticyclone are two important types of cyclonic activity. The atmospheric disturbance which involves a closed circulation about a low-pressure center, anticlockwise in the northern hemisphere and clockwise in the southern hemisphere, are called cyclones. On the other hand, anticyclone plays a much less important role in the weather-drama at the surface of the earth in comparison with the cyclone. It denotes on atmospheric system that is just opposite of the cyclonic system.

When the wind is spirally moving in towards a low-pressure center then it is called a cyclone. A cyclone has a low pressure at its center and high pressure on the surrounding sides. The wind movement is anti-clockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere.

When the wind blows from the high-pressure center towards the low-pressure center this atmospheric disturbance is known as a cyclone. Cyclone blows anticlockwise in the southern hemisphere. It blows anticlockwise because of the Coriolis force produced by the rotation of the earth.

An area of closed, circular fluid motion rotating in the same direction as the Earth is known as a cyclone. It has a lower pressure inside and higher pressure outside. The center of the cyclone is known as the eye. It has a diameter of 20-50 km. It is the point about which the rest of the storm rotates. It has the lowest atmospheric pressure.

When high speed wind blows from high pressure towards the low pressure centre is known as cyclone. Their frequency, direction and intensity varies from place to place. In terms of direction it blows clock wise in southern hemisphere and anti-cyclone wise in  northern hemisphere. The frequncy and intensity also varies with its location and depending on that cyclones are known in different names in different places.

An anti-cyclone originates when a mass of air with high pressure is encircled by that with low pressure. When such condition occurred the relatively cool and dry wind from high pressure blows out to the surrounding low pressure.  While blows out, the wind turns round and round. In anti-cyclone  there exits high pressure at the center, it is called the center or eye of anti-cyclone.