How could a flight crew visually identify that a tropical squall line is about to pass over their destination aerodrome, and
what hazard should they expect to encounter on the approach?

Question

How could a flight crew visually identify that a tropical squall line is about to pass over their destination aerodrome, and 
 what hazard should they expect to encounter on the approach?

Answer

A line of Lenticular cloud will be followed by a rapid drop in temperature and severe rime ice.

Answer

A cloud will increase rapidly from a Cirrus layer, to Cirrostratus then Altostratus and Nimbostratus, producing 
 rain ice

Answer

A band of Stratocumulus clouds will rapidly lower its base into frontal fog.

Answer

A distinct roll cloud will be followed by a sudden, rapid increase in wind.

Crowdly

How could a flight crew visually identify that a tropical squall line is about t...

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