3. A Cyclone is an area of closed,
circular fluid motion rotating in the
same direction as the Earth.
4. ALSO KNOWN AS…..
5. TYPES OF CYCLONES
TROPICAL CYCLONES: these are cyclones that
occur over tropical ocean regions.
Tropical Disturbance: Winds weak and
Tropical Depression: Winds less than 39 mph
Tropical Storm: Winds 39 to 74 mph
Hurricane: Winds greater than 74 mph
6. POLAR CYCLONES: are cyclones that occur
in polar regions like Greenland, Siberia and
MESOCYCLONES: is when part of a
thunderstorm cloud starts to spin, which
may eventually lead to a tornado.
7. NAMING OF A CYCLONE
Cyclones derive their names through a
systematic procedure laid down by the World
Meteorological Organization (WMO).
Eight north Indian Ocean countries -
Bangladesh, India, the Maldives, Myanmar,
Oman, Pakistan, Sri Lanka and Thailand - have
prepared a list of 64 names.
10. ♣ Once the cyclone is fully developed, well-defined
♣ A front is defined as the transition zone between
two air masses of different density.
♣ Fronts extend not only in the horizontal direction,
but in the vertical as well
An air mass is a large body of air that
has similar temperature and moisture
The best source regions for air masses
are large flat areas where air can be
stagnant long enough to take on the
characteristics of the surface below
14. IMPACTS OF CYCLONES
LOWERING OF SEA SURFACE TEMPERATURES
DISRUPTING INTERNATIONAL SHIPPING
MAINTAINS GLOBAL HEAT BALANCE
16. BEFORE THE CYCLONE
Check the house; secure loose tiles, carry out
repair works for doors and windows
Remove dead woods or dying trees close to the
house; anchor removable objects like lumber
piles, loose tin sheds, loose bricks, garbage
cans, sign boards etc which can fly in strong
Keep some glass boards ready so that glass
windows can be boarded if needed.
Demolish condemned buildings
Keep some dry non perishable food always
ready for emergency use.
17. WHEN THE CYCLONE STARTS
Listen to the radio about weather warnings
Keep monitoring the warnings.
Pass on the information to others, believe in the
official information only.
Ignore rumors and do not spread them; this will help
to avoid panic situation.
Be sure that a window and door can be opened only
on the side opposite to the one facing the wind.
If the centre of the cyclone is passing directly over
your house there will be a lull in the wind and rain
lasting for half and hour or so. During this time do not
go out; because immediately after that very strong
winds will blow from the opposite direction.
18. Switch off electrical mains in your house.
Believe in the official information when a cyclone
alert is on for your area, continue normal working
but stay alert to the radio warnings.
Remember that a cyclone alert means that the
danger is within 24 hours. Stay alert.
If your house is securely built on high ground take
shelter in the safer part of the house. However, if
asked to evacuate do not hesitate to leave the
Provide strong suitable support for outside doors.
Keep torches handy
19. WHEN EVACUATION IS INSTRUCTED
Pack essentials for youeself and your family
to last you a few days, including medicines,
special foods for babies, children or elders.
Head for the proper shelter or evacuation
points indicated for your area.
Do not worry about your property
At the shelter follow instructions of the
person in charge
Remain n the shelter until you have been
informed to leave.
20. POST CYCLONE MEASURES
You should remain in the shelter until
informed that you can return to your home.
Strictly avoid any loose and dangling wires
from the lamp posts
If you are to drive, drive carefully.
Clear debris from your premises immediately.
Report the correct loss to appropriate