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Greenhouse effect
belt of cloud and rain. Fronts can be warm fronts, cold fronts, or occluded fronts. An observer can recognise a warm front because the air changes from cold to warm, while a cold front produces a change from warm to cold air.
An occluded front is usually marked by cold air becoming quickly colder. Warm fronts are
broader and make less intense rain than cold fronts.
(See also: Depression.)
Frost
Occurs when moisture in the air freezes onto surfaces, producing a thin film of ice crystals.
Freezing normally occurs when the temperature of the surface falls to 0°C. (See also: Hoar frost and Rime.)
G
Gale
A strong wind blowing between force 7 (near gale) through force 9 (severe gale) up to force 10 (full gale or storm) on the Beaufort scale.
 Greenhouse effect – The Sun’s rays can reach the ground without being absorbed by the air. However, radiation from the ground is reflected by clouds and absorbed by carbon dioxide and water vapour in the air, so less gets out than comes in and the air heats up.
 Frost – As moisture-laden air blows gently past the cold surfaces, it forms ice crystals.
Glaze
A coating of ice due to freezing rain or to rain that freezes overnight, when temperatures are often lower. (See also: Black ice.)
Greenhouse effect
The gradual warming of the world’s atmosphere due to the increase in the amount of carbon dioxide in the air.
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