PORTLAND, Ore. (KOIN) — Rare noctilucent clouds were spotted over downtown Portland late Tuesday night. The National Weather Service defines noctilucent clouds as “thin silvery-blue cirrus-like clouds frequently seen during summer twilight conditions at high latitudes (above 50°) in both hemispheres. These clouds are primarily composed of ice crystals at heights 50-70 miles above the […]
Josh Cozart
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