21.   Thunderstorms and cloud formations have fascinated Ashton since childhood.

22.   A hurricane hunter aircraft checked the system after a swirling cloud formation developed Monday morning.

23.   A pilot may become confused by cloud formations or from the motion of his plane.

24.   It describes images of striking sky and cloud formations on black-and-white film.

25.   The combination of these two parameters has resulted in a suppression of cloud formation and hence little or no rain.

26.   The half-ton of iron filings used also caused a three-fold increase in dimethyl sulphide particles, which have a key role in cloud formation.

27.   While the possibility of the front turning into a cyclone on Tuesday was remote, the mountainous terrain of Tawi-Tawi could encourage cloud formation, he said.