Date: 24 Jan 98 02:53:17 From: Paul Hathaway <Paul_Hathaway@ML.Com> Organization: Merrill Lynch References: 1
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Philip Miller wrote: > Can someone explain how this phenomenon occurs? Is it simply a change > in density of the air due to temperature? As far as I understand it can be caused by high velocity air masses such as the jetstream dipping lower than usual. Paul.