An instrument used to measure water vapour content of the atmosphere. The thermometers are ventilated to cause evaporation off the wet bulb thermometer. An instrument package connected to a weather balloon that collects, and transmits by radio, meteorological data as it ascends through the atmosphere. Lush forests growing in regions of high precipitation. Most well known are the tropical rainforests or jungles such as in the Amazon basin.
Rainforests also grow along the northern Pacific coast of North America.
These great northern and temperate rainforests covered much of coastal regions of southern Alaska, British Columbia, and Washington State. The region on the lee side of a mountain or mountain range, where precipitation is decreased compared to the windward side. The rain shadow results when moisture-laden air is forced to ascend the encircling mountains and thus drops most of that moisture on the windward side of the range summits. As the air descends from the ridge, it is drier and warmer. Not only does the compression of descent warm the air, it also evaporates much of the liquid water, causing clouds to disappear.