What were the causes of the bhola cyclone?

Question

What were the causes of the bhola cyclone?

Answer 1

A tropical cyclone is a warm-core, low pressure system without any "front" attached, that develops over the tropical or subtropical waters, and has an organized circulation. Depending upon location, tropical cyclones have different names around the world. In the:

Atlantic/Eastern Pacific Oceans - hurricanes

Western Pacific - typhoons

Indian Ocean - cyclones

Regardless of what they are called, there are several favorable environmental conditions that must be in place before a tropical cyclone can form. They are:

Warm ocean waters (at least 80°F / 27°C) throughout a depth of about 150 ft. (46 m).

An atmosphere which cools fast enough with height such that it is potentially unstable to moist convection.

Relatively moist air near the mid-level of the troposphere (16,000 ft. / 4,900 m).

Generally a minimum distance of at least 300 miles (480 km) from the equator.

A pre-existing near-surface disturbance.

Low values (less than about 23 mph / 37 kph) of vertical wind shear between the surface and the upper troposphere. Vertical wind shear is the change in wind speed with height.

Tropical Cyclone Formation Basin

READ MORE ON CYCLONES

http://www.srh.noaa.gov/srh/jetstream/tr...

Answer 2

cyclones arrive almost exclusively over tropical islands, towards the end of their hot season. conditions that would cause a cyclone would be that the air over the heated area expands, becoming lighter and rising. the surrounding cooler air is drawn in to take its place, the inflowing winds pursuing a spiral course as an effect of the Earth's rotation. the cyclone becomes an eddy or vortex from 100 to 150 miles in diameter, but sometimes as much as 900 miles, the direction of rotation being anti-clockwise in the northern hemisphere and clockwise in the southern hemisphere.

the inflowing winds will blow with considerable force in gales, storms, and hurricanes. such a cyclone is almost perfectly circular, the winds blowing violently round a small calm centre from ten to thirty miles across. this is called 'eye of the storm'. surrounding the 'eye' dense black clouds mark the course of the winds, and here there is torrential rain.

Answer 3

Causes? Not sure. Here are some resources... There will probably be some discussion of the early development of the tropical disturbance.

http://en.wikipedia.org/wiki/1970_Bhola_...

http://www.meteogroup.co.uk/uk/home/weat...

http://www.makefive.com/categories/debat...