CPL Meteorology and Weather Interpretation

Question 1

What causes wind to flow around high and low pressure systems?

Accepted Answer

Pressure gradient and Coriolis effect

Answer

Wind flows from areas of high pressure to areas of low pressure due to the pressure gradient force. However, the Coriolis effect, caused by the Earth's rotation, deflects this wind. In the Northern Hemisphere, it deflects winds to the right, leading to the characteristic clockwise flow around high-pressure systems and counter-clockwise flow around low-pressure systems.

Question 2

What does a METAR report provide to pilots?

Accepted Answer

Current weather conditions

Answer

A METAR (Meteorological Aerodrome Report) is a routine aviation weather report that provides a snapshot of the current weather conditions at an airport. It includes vital information such as wind speed and direction, visibility, sky conditions, temperature, dew point, and altimeter setting. Pilots use METARs for pre-flight planning and to assess real-time conditions.

Question 3

Which weather phenomenon is most hazardous during landing?

Accepted Answer

Wind shear

Answer

Wind shear, a sudden and drastic change in wind speed and/or direction over a short distance, is particularly hazardous during landing. A sudden decrease in headwind or increase in tailwind due to wind shear can cause a rapid loss of airspeed and lift, potentially leading to a dangerous sink rate, a hard landing, or even a stall close to the ground.

Question 4

What does a SIGMET alert pilots to?

Accepted Answer

Severe weather conditions

Answer

A SIGMET (Significant Meteorological Information) is a weather advisory that alerts pilots to severe weather phenomena that are potentially hazardous to all aircraft. These include severe turbulence, severe icing, widespread dust storms, sandstorms, or volcanic ash. SIGMETs are issued for conditions that are widespread or of significant intensity, requiring immediate attention from pilots for flight safety.

Question 5

What indicates potential aircraft icing conditions?

Accepted Answer

Visible moisture and subfreezing temperatures

Answer

Aircraft icing occurs when supercooled water droplets (visible moisture like clouds or rain) come into contact with an aircraft surface that is at or below freezing temperatures. These droplets then freeze upon impact, accumulating ice on wings, propellers, and other surfaces. Both visible moisture and subfreezing temperatures are necessary conditions for structural icing to form.

(CPL) Commercial Pilot Licence Practice Test

(CPL) Commercial Pilot Licence Practice Test

CPL Meteorology and Weather Interpretation