An unusual meteorological phenomenon was seen in Switzerland on Wednesday, when a "river of clouds" descended through the Grimsel pass in the Swiss Alps and into a nearby valley.

Known as inversion, the phenomenon takes place when the normal temperature profile with altitude is inverted, meaning air temperature increases with height as opposed to the usual decrease in temperature in higher altitudes.

Warmer air then flows above cooler air, resulting in what looks like a river of clouds.

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