- A river valley, where fog forms or persists
- W973057Z
- Where fog forms or persists. A thin veil of mist hangs on from early morning fog. This deep river valley shelters the cooling, early morning air, allowing the radiation fog to form and persist only here. The temperature fell just below the dewpoint bringing the moisture in the air to saturation while nearby unprotected open land remained warmer and fog free in a light breeze.
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