5 Unusual rainbows | Amazing Weather
Rainbows are formed by light refracting though drops or crystals of water in the atmosphere. And if rainbows weren't rare enough, under rare conditions even rarer rainbow are visible.
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What is Pacific Decadal Oscillation (PDO)?
Pacific Decadal Oscillation is a surface temperature oscillation in the northern Pacific Ocean similar to the El Niño/La Niña oscillation but over a larger area of the Pacific and a longer time frame. It too influences rainfall in western North America and southwestern Pacific.
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What is a Nor'Easter?
An intense low pressure system moving up the Eastern coast of the United States carrying moisture rich tropical air may lead to heavy precipitation inland upon reaching colder northern climes as winter storms know as Nor'easters.
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Different types of rain
Rainfall occurs when warm moist air encounters cold temperatures causing the water vapor to condense in to rain drops.
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