weatherch11 - ATOC 1050 Chapter 11 notes Freezing...

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ATOC 1050 Chapter 11 notes Freezing precipitation: rain or drizzle that freezes when it hits the ground making an ice glaze on the ground SUPERCOOLED WATER: It is water that is below freezing temperature but is not frozen because it does not have enough ice nuclei which are present in the atmosphere. Ice nuclei are most effective at promoting the formation of ice crystals at colder than -15°C and are moderately effective from -15° to -5°C and are almost not effective at all from -5°C to 0° C 2 Ways in which freezing precipitation can form: The Melting Process: This occurs when snow falls from high in the clouds into a layer that is above freezing temperature where it melts and becomes rain. It then falls into the next layer below freezing temperatures where it becomes supercooled and freezes upon contact with the ground. Supercooled Warm Rain Process: This is when tiny cloud droplets grow to precipitation size by colliding and coalescing with each other.
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