Date: 24 Jan 98 02:53:16 From: "JCSFlyboy" <firstname.lastname@example.org> Organization: INTERNET AMERICA References: 1
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Philip Miller wrote in message ... >Can someone explain how this phenomenon occurs? Is it simply a change >in density of the air due to temperature? 1. Wind shear in the vicinity of upper level wind shifts. 2. Abrupt temperature changes through upper level fronts. 3. Waves formed in a strong wind flow downwind of high terrain or strong thunderstorms. or 4. The abrupt wind and/or temperature change near the Tropopause.