Q. Consider the following statements:

Jet streams occur in the Northern Hemisphere only.
Only some cyclones develop an eye.
The temperature inside the eye of a cyclone is nearly 10 C lesser than that of the surroundings.

Which of the statements given above is/are correct:

Answer: c) 2 only

Jet streams occur in both the Northern and Southern Hemispheres.
Jet streams are the strong air streams present in the upper troposphere.
They are relatively narrow belts of swift-moving winds having velocity in the range of 100km/hr to 900km/hr.
Jet streams follow curved and meandering path and such path is because of Coriolis effect
And due to the tendency of large scale system to conserve the angular momentum.
They are very strong winds.

Extra-tropical cyclones may not always have an eye, whereas mostly mature storms have well-developed eyes.
- Rapidly intensifying storms may develop an extremely small, clear, and circular eye, sometimes referred to as a pinhole eye.
It is warmer and not colder inside the eye of the tropical cyclone.
- The warmer temperature is what drives the storm.
Conditions to form tropical cyclone
- Large sea surface with a temperature higher than 27° C.
- Presence of the Coriolis force enough to create a cyclonic vortex.
- Small variations in the vertical wind speed.
- A pre-existing weak low-pressure area or low-level-cyclonic circulation.
- Upper divergence above the sea level system.