What should pilots do if icing is detected while also experiencing a rolling condition?

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How much colder than standard temperature is the forecast temperature at 9,000 feet, as indicated in the following excerpt from the Winds and Temperature Aloft Forecast?

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6,000 ft 9,000 ft
0737-04 1043-10

What is the most likely reason for buffeting or vibrations after extending the flaps during or exiting icing conditions?

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