Factors of ice accretion

 

 

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If wind force increases above force 6, the rate of ice accretion increases because:

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Wind chill factor increases.

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Increase of shipping sprays

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Air temperature falls below -2°C

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Sea temperature decreases

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Shipping seas and sprays increases

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Excessive ship's speed

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Unsuitable ship's course

 

 

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Rate of ice accretion on a slow moving ship with the wind ahead or on the beam, given wind and sea temperature, can be estimated using "Icing Nomograms" given in mariner's handbook (reproduced below):