The deep depression over the southeast Bay of Bengal that has intensified into a cyclonic storm ‘Amphan’ on Saturday is likely to intensify into a severe cyclonic storm and move north-northwestwards on Sunday.
- According to the India Meteorological Department, the Amphan is expected to re-curve north-northwestwards across the northwest Bay of Bengal towards West Bengal and adjoining north Odisha coasts on Monday and Tuesday.
Warning of Tropical Cyclones
- Detection of any unusual phenomena in the weather leading to cyclones has three main parameters: fall in pressure, increase in wind velocity, and the direction and movement (track) of the storm.
- There is a network of weather stations monitoring pressure fall and wind velocities in all countries of the world, including the Arctic and Antarctic regions.
- The islands attain special significance in this as they facilitate monitoring of these developments.
- In India, there are detection radars along both the coasts.
- Monitoring is also done by aircraft which carry a number of instruments including weather radar.
- Cyclone monitoring by satellites is done through very high-resolution radiometers, working in the visual and infra-red regions (for night view) of the spectrum to obtain an image of the cloud cover and its structure.
- Remote sensing by radars, aircraft, and satellites helps predict where exactly the cyclone is going to strike. It helps in taking advance steps in the following areas:
- a.) closing of ports and harbors,
- b.) suspension of fishing activities,
- c.) evacuation of the population,
- d.) stocking of food and drinking water, and
- e.) provision of shelter with sanitation facilities (safety homes).
- Today, it is possible to detect a cyclone right from its genesis in the high seas and follow its course, giving a warning at least 48 hours prior to a cyclone strike.
- However, the predictions of a storm course made only 12 hours in advance do not have a very high rate of precision