Question

what measures should be taken at the time of cyclone and after cyclone

Answer 1

When the cyclone strikes
Disconnect all electrical appliances. Listen to your battery radio for updates.
Stay inside and shelter {well clear of windows) in the strongest part of the building,
i.e. cellar, internal hallway or bathroom. Keep evacuation and emergency kits with you.
If the building starts to break up, protect yourself with mattresses, rugs or blankets under a
strong table or bench or hold onto a solid fixture, e.g. a water pipe.
Beware the calm 'eye'. If the wind drops, don't assume the cyclone is over; violent winds
will soon resume from another direction. Wait for the official 'all clear'.
If driving, stop (handbrake on and in gear) - but well away from the sea and clear of trees,
power lines and streams. Stay in the vehicle.

After the cyclone
Don't go outside until officially advised it is safe.
Check for gas leaks. Don't use electric appliances if wet.
Listen to local radio for official warnings and advice.
If you have to evacuate, or did so earlier, don't return until advised. Use a recommended route and don't rush.
Beware of damaged power lines, bridges, buildings, trees, and don't enter floodwaters.
Heed all warnings and don't go sightseeing. Check/help neighbours instead.
Don't make unnecessary telephone calls.
Hope it helps...

Answer 2

Violent tropical storms in which strong wind move in a circle..