Mount Shuksan and Valley Fog, North Cascades, Washington

Thick fog covers a high mountain valley beneath Mount Shuksan, a 9,127-foot (2,782-meter) peak located in the North Cascades National Park in Washington state. Valley fog, which is a type of radiation fog, can be incredible dense. It forms when air along ridgetops and mountain slopes cools after sunset. The air then becomes dense and sinks into the valley below where it continues to cool and becomes saturated, causing fog to form. Shuksan is derived from a Skagit Indian word meaning "rocky and precipitous."

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Thick fog covers a high mountain valley beneath Mount Shuksan, a 9,127-foot (2,782-meter) peak located in the North Cascades National Park in Washington state. Valley fog, which is a type of radiation fog, can be incredible dense. It forms when air along ridgetops and mountain slopes cools after sunset. The air then becomes dense and sinks into the valley below where it continues to cool and becomes saturated, causing fog to form. Shuksan is derived from a Skagit Indian word meaning "rocky and precipitous."