Upslope fog forms through a process called orographic lifting. π¬
οΈ When warm, moist air hits a mountain, it is pushed upwards. As the air goes higher, it cools down because it gets farther from the warm ground. β
οΈ When the air cools to its dew point, the water vapor in the air condenses into tiny water droplets, creating fog. This is why you can often find fog on mountainous days! Mountains like
Mount Rainier in Washington State often show this fog beautifully. π²
The rising air can also carry tiny bits of dust, which can help fog form faster!