The ITCZ and Thunderstorm Tops

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Which direction does the circulation of a tropical cyclone flow in the northern hemisphere?

Clockwise

Upwards

Counterclockwise (correct)

Downwards

What is the term used to describe a severe tropical low in the Southern Hemisphere?

Cyclone (correct)

Typhoon

Hurricane

Tropical Cyclone

What is the primary weather feature of the Inter-Tropical Convergence Zone (ITCZ)?

Clear skies

CB clouds with thunderstorms and heavy showers (correct)

Fog

Snow

What is the minimum water temperature required for the formation of a hurricane?

79°F Signup and view all the answers

Which layer of the atmosphere is significant for flight crews as it indicates the vertical limit of most weather and the likely location of the jet stream?

Troposphere Signup and view all the answers

What is Runway Visual Range (RVR) used to measure?

Visibility in the runway environment Signup and view all the answers

When are RVR values reported?

When visibility is less than 2,000 m Signup and view all the answers

What is the thin layer between the troposphere and stratosphere called?

Tropopause Signup and view all the answers

Which term is used to describe expected temporary fluctuations to meteorological conditions which reach specified threshold criteria and last for a period of less than 1 hr in each instance?

TEMPO Signup and view all the answers

What is the purpose of a SNOWTAM?

To provide information about runway contamination Signup and view all the answers

What is the maximum validity of a SNOWTAM?

8 hrs Signup and view all the answers

What are SIGMETs issued for?

Areas of active thunderstorms Signup and view all the answers

Which of the following clouds are classified as high level clouds?

Cirrus Signup and view all the answers

What is the main factor that determines the position of a jet stream?

Temperature Signup and view all the answers

What is Clear Air Turbulence (CAT) often associated with?

Cirrus clouds Signup and view all the answers

What is the Intertropical Convergence Zone (ITCZ)?

The area near the equator where trade winds converge Signup and view all the answers

Which aviation forecast centre issues SIGMET and AIRMET bulletins?

The National examples shown in the text Signup and view all the answers

What does the alphanumeric code in a SIGMET indicate?

The sequential issuance of a SIGMET Signup and view all the answers

How long are SIGMET validity periods generally?

4 to 6 hours Signup and view all the answers

Where can flight crews source additional weather information and updates?

All of the above Signup and view all the answers