Steven Goddard
Having been burned by their “snow is a thing of the past” predictions, alarmists changed tack recently and started claiming that “global warming causes more snow because there is more moisture in the air” - and that they predicted it all along.
This is a remarkably dense (and dishonest) assertion for many reasons, and I will cover a few of them briefly.
The recent snowy winters have been cold, not warm. During the warm winters in the late 1990s, there was very little snow. Since the turn of the century, temperatures have been plummeting in Alaska, the US, western Canada, Europe, Russia Asia and the Pacific Ocean – as seen below, and that has brought near record snow. The Sahara desert has warmed, but it doesn’t have any water to evaporate and add to the atmosphere.
Second, most of the claimed warming has been in the Arctic and in winter, where temperatures are too cold to evaporate much water. March, 2010 was the “hottest” month in the GISS record, and most of the anomalously “warm” areas were colder than -10C. Those regions don’t add water vapour to the atmosphere during the winter, rather they remove it. Deserts don’t add moisture to the atmosphere either, and the tropics have shown very little warming over the last 30 years.
Third, cold air can’t hold much water. Snow happens when cold air arrives and condenses the little bit of water which is in the air.
Every child understands that snow is associated with cold – only an adult could be stupid enough to think otherwise. Snow does not occur in the deep south because of global warming. It occurs because of cold air – which holds less moisture. Cold air causes snow to precipitate, which is why snow occurs after a cold front passes.
Link:
http://www.real-science.com/
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