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Questions and Answers
Match the following cloud types with their respective coding in the observation report:
Match the following cloud types with their respective coding in the observation report:
Altocumulus perlucidus or Stratocumulus perlucidus (mackerel sky) = N = 7 or less Blue sky or stars seen through fog without any trace of cloud = N = 0 Persistent condensation trails and cloud masses developed from them = CH or CM code figure Clouds observed through fog or analogous phenomena = Evaluated as if phenomena were non-existent
Match the following cloud characteristics with their reporting instructions:
Match the following cloud characteristics with their reporting instructions:
Altocumulus perlucidus or Stratocumulus perlucidus (mackerel sky) = Report using N = 7 or less Blue sky or stars seen through fog without any trace of cloud = Code N as 0 Clouds observed through fog or analogous phenomena = Evaluate and report as if phenomena were non-existent Persistent condensation trails and cloud masses developed from them = Report as cloud using appropriate CH or CM code figure
Match the following wind reporting guidelines with their descriptions:
Match the following wind reporting guidelines with their descriptions:
ddff notation = Mean direction and speed of wind over preceding 10-minute period Discontinuity in wind characteristics during 10-minute period = Use data obtained after discontinuity for mean values reporting Absence of wind instruments = Estimate wind speed based on Beaufort wind scale Rapidly dissipating condensation trails = Not included in total cloud cover amount
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