Noctilucent

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Weather

Noctilucent clouds are so high in the atmosphere that they are still illuminated by the sun even after it has set below the horizon for ground observers. elaborate share

Sleet

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Weather

Sleet, unlike hail, freezes *after* it falls as rain. elaborate share

Mirages

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Mirages aren't actually reflections; they're caused by light bending as it passes through layers of air with different temperatures. elaborate share

Sun Dogs

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Weather

Sun dogs, also known as parhelia, are sometimes accompanied by a faint, luminous arc called a **parhelic circle** that stretches horizontally across the sky. elaborate share

Jet Streams

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Weather

Jet streams can reach speeds exceeding 200 mph. elaborate share

Fogbows

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Weather

Fogbows, unlike rainbows, are white or grey because the water droplets in fog are too small to separate sunlight into its spectral colors. elaborate share