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Refer to figure.
For an aircraft making an approach to an airfield located in square 3B, the most likely weather conditions are:
  • A
    low cloud, mist.
  • B
    scattered AC base 2 000 ft, good visibility.
  • C
    showers of rain and hail.
  • D
    moderate continuous rain.

Refer to figure.

The figure depicts a Cross-section of a Polar depression frontal system.
-A cold front is illustrated in column “A”
-A warm front is illustrated diagonally from “3C” to “1E”.

COLD FRONT.

  • Typical cloud types for a cold front are CU and CBs – column “A”
  • We can also find AC or AS clouds at medium levels – “2A”
WARM FRONT.
  • Cl (cirrus) clouds at FL250-350 as far as 600 NM ahead of the front – “1E”
  • CS (cirrostratus) clouds at FL200-250 – “1D”
  • AS (altostratus) clouds at around FL150-200 – “2D”
  • NS (nimbostratus) clouds between 6000 – 8000 – “2C” and “3C”
  • ST or SC (stratus or stratocumulus) clouds can be encountered the NS – “3B”
  • Frontal FOG can sometimes be encountered ahead of the frontal ground surface – “3B” and “3C”
Therefore, in square 3B we may found a Stratus/stratocumulus cloud or frontal fog. Stratus/stratocumulus have low bases and may cause misty conditions/drizzle => usually IMC.

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