Sentences with phrase «when updraughts»

Not exact matches

However water vapour is not pulled away from cloud forming regions when only deep 15 km updraughts are present.

Observations show when water vapour is taken up by the atmosphere through evaporation, the updraughts can either rise to 15 km to form clouds that produce heavy rains or rise just a few kilometres before returning to the surface without forming rain clouds.

Hailstones are created so it is believed, by a more or less continuous loop of being caught in violent updrafts as found in thunderstorms, ie; above glider example, and then falling out of the updraught cell back down to lower levels where they might be caught up again in another or the same updraft cell and so accumulate water and ice on the core of the frozen hailstone over a period of anywhere from just one passage in the updraft to a number of passages which can be ascertained and recognised by the number of rings when a hailstone is dissected across its diameter.