CYCLONE

TROPICAL CYCLONE OF INDIA

PRESENTED BY

RAJASHREE NAIKM.Sc,Environmental Science

Central University of Rajasthan

CONTENTS

1.Definition2.Cause3.Features4.Structure5.Regions of Occurence6.Factors7.Conditions of Occurence8.Lifecycle9.Categories.

DEFINITION

Literally CYCLONE can be defined as the process of storm formation that ultimately leads to hurricanes,typhoons,tropical cyclone in various parts of the world.

Technically CYCLONE is defined as a LOW PRESSURE SYSTEM of synoptic scale developing over WARM WATER having organised convection persisting for atleast 6hours.

FEATURES

Damaging Storm

Air in the centre is warmer than surrounding air

Heavy PrecipitationStrong Revolving Mass

Falls under SYNOPTIC SCALE

Low Pressure System

Produce Powerful Wind

Develop over Warm Water Bodies

Loose strength moving over land areas

REGIONS of CYCLONE

Those regions where the Cyclonic Activities are Common are known as CYCLONIC BASINS.

There are 8 Basins in WORLD.

All of the basins are Monitered by METEREOLOGICAL ORGANISATIONS

SERIAL SERIAL NO.NO.

BASINSBASINS INSTITUTIONSINSTITUTIONS

1 North Atlantic National Hurrican Centre

2 North-East Pacific National Hurrican Center

3 North Central Pacific Central Pacific Hurrican Centre

4 North-West Pacific Japanese Meteorological Department

5 North Indian Ocean Indian Meteorological Department

6 South-West Indian Ocean Indian Meteorological Department

7 Australian Region Bureau of Meteorology

8 Southern Pacific Fiji meteorology Service

Conditions for Cyclone Formation

Warm water(atleast 26.5 deg.cls)

Atmospher that cools fast with height

Relatively moist layers near about 5km

Minimum 500km from Equator

Pre-exixting disturbance near surface

Little change in wind height

LIFE CYCLE

CATEGORY

SPEED

NATURE

EFFECTS

I. 62-87 MINOR MINIMAL HOUSE AND CROPS DAMAGE

II. 88-117 MODERATE RISK OF POWER FAILUREHEAVY DAMAGE TO CROPS,TREES

III. 118-167 LARGE HIGH BUILDINGS AND SIGN POST DAMAGE

IV. 168-221 EXTENSIVE SIGNIFICANT ROOFING AND STRUCTURAL DAMAGE

V. >222 CATASTROPHIC SEVERE AIR BORN DISEASE,WIDESPREAD DESTRUCTION