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The main factors that determine cloud detection by airborne weather radar are the…

  • A
    range from cloud, wavelength and frequency used.
  • B
    rotational speed of the radar scanner and range from cloud.
  • C
    size of the water drops, wavelength and frequency used.
  • D
    size of the water drops and diameter of the radar scanner.

Airborne Weather Radar is a type of radar used to provide an indication to pilots of the intensity of convective weather. Modern weather radars are mostly doppler radars, capable of detecting the motion of rain droplets in addition to intensity of the precipitation.
Typically, the radar antenna is located in the nose of the aircraft. Signals from the antenna are processed by a computer and presented on a screen which may be viewed by the pilots. Droplet size is a good indicator of strong updrafts within cumulonimbus clouds, and associated turbulence, and is indicated on the screen by patterns, colour coded for intensity. It needs to be noted that the frequency band of the radio waves (X band) is selected not to detect any cloud, small precipitation such as drizzle, fog or wind, as the droplets are too little or don’t exist. Some airborne weather radar systems may also be able to predict the presence of wind shear.

*Green: light precipitation
*Yellow (or amber): medium precipitation
*Red: heavy precipitation
*Magenta: Extremely high precipitation

Radar Mode:

  • Weather only Mode (WX)

  • Weather + Turbulent Mode( WX+T): The areas which have strong turbulence will be showing in magenta on the display. This area is formerly showed in green on WX only Mode.

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