1. There has been a lot of turbulence, a lot of unpredictability.

2. The incident came one day after a United Airlines flight encountered severe turbulence that injured five people.

3. The stock market turbulence and increasing downside risks from the world economy did affect the consumers mood apparently, he said.

4. But aviation experts say it would be unusual for a lightning strike or severe turbulence to damage a modern commercial aircraft.

5. There could have been turbulence, lightning and vertical as well as horizontal strong winds within such clouds, he said.

6. The same principles of turbulence apply to both fields, however, as air currents play a large role in weather forecasting.

7. But there is plenty of turbulence ahead.

8. Now, there are hints of turbulence creeping back into the market.