Nacreous Clouds

Today’s rare guest in Oslo sky is the nacreous cloud. It forms when the fading light at sunset passes through tiny ice crystals blown along by a strong jet of stratospheric air. The clouds form only in polar latitudes and at extremely cold temperatures below −78 °C at altitudes of 15,000–25,000 meters.

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אוסלו עם מדריך מקומי דובר עברית
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