Mt Hood Sunrise Over Radiation Fog

Mount Hood 3,426m (11,239ft) viewed from Portland, Oregon. The left skyline is the Northwest Ridge (named Cathedral Ridge); the right skyline is the Southeast Ridge. The bulge in the Southeast Ridge is called the Steel Cliff. Mount Hood is a stratovolcano in the Cascade Volcanic Arc of Northern Oregon. Sunrise provides backlighting glow to radiation fog (Valley Fog) filling the valleys on this cool autumn morning. Radiation fog results from radiation cooling of the ground and adjacent air under clear night skies and elevated relative humidity, most common in autumn. Normally, this fog dissipates within a few hours of sunrise as the sun warms the ground.

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Contained in galleries: Portland, Mt Tabor Park

Mount Hood 3,426m (11,239ft) viewed from Portland, Oregon. The left skyline is the Northwest Ridge (named Cathedral Ridge); the right skyline is the Southeast Ridge. The bulge in the Southeast Ridge is called the Steel Cliff. Mount Hood is a stratovolcano in the Cascade Volcanic Arc of Northern Oregon. Sunrise provides backlighting glow to radiation fog (Valley Fog) filling the valleys on this cool autumn morning. Radiation fog results from radiation cooling of the ground and adjacent air under clear night skies and elevated relative humidity, most common in autumn. Normally, this fog dissipates within a few hours of sunrise as the sun warms the ground.