1.) Explain why there is rarely lake effect snow on the northern shores of the g
ID: 287592 • Letter: 1
Question
1.) Explain why there is rarely lake effect snow on the northern shores of the great lakes 2.) Provide at least TWO reasons why very cold polar or arctic airmasses may form over far northern Canada in the winter but are unlikely to form in the summer. 3.) Describe similarities and differences between a blizzard and a ground blizzard 4.) Suppose a thermometer is held outside in a strong wind. Why after the thermometer has equilibrated, does it show the actual temperature? And not the wind chill temperature?Explanation / Answer
1. The phenomenon of lake effect snow is caused by the dynamics of atmospheric circulation involving cold and hot air masses in the vicinity of lakes. The water of the lakes is warm and cold air moves over the warm lake water in the ambience of cold atmospheric conditions. The lower layer of atmospheric air lies just above the warm water of the lakes. When the cold expanse of air moves over the warmer air mass above the lake water, the cold air takes up water vapour from the lakes. This cold air, laden with water vapour, rise up through the successive layers of the atmosphere and form snow on the upper layers. Thus, a lake effect snow is formed. This is characteristics of the great lakes.
However, lake effct snow is not formed on the northern shores of the Great Lakes because the water of the lakes in the vicinity of ther northern shores is not warm. Thus, moving cold air cannot take up water vapour which in turn would rise up in the atmospheric layers to form snow.
2. Very cold arctic airmasses are likely in winter but not in summer in the Northern parts of Canada due to the following two reasons:
3. Similarities between blizzard and ground blizzard:
Differences between blizzard and ground blizzard:
4. The thermometer in such a case shows the actual temperature and not the wind chill temperature because thermometer and wind-chill effect are not inter-related. The wind chill effect can be attributed to a the amount of heat that a body loses. This body was primordially warmer than the surrounding air. On the contrary, thermometer measures just the temperature - thermometer does not cause a body to lose heat as the wind-chill effect does. This is obviously a dry bulb thermometer and it does not conduct away moisture.
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