Weather impacts on aviation :)

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Across
  1. 4. The formation of ice on an aircraft, ship, or other vehicle
  2. 6. Caused by the relative movement of disturbed air through which an aircraft is flying
  3. 7. The amount of work to be done by someone or something
  4. 8. (of a surface or object) Difficult to hold firmly or stand on because it is smooth, wet, or slimy
Down
  1. 1. Cloud forming a towering mass with a flat base at fairly low altitude and often a flat top, as in thunderstorms
  2. 2. Pellets of frozen rain which fall in showers from cumulonimbus clouds
  3. 3. When the flight changes its destination, when the pilot decides to land at a different airport
  4. 5. When the flight changes its path, in order to avoid a CB or flock of birds