🌧️🌨️ Precipitation Formation & Types

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Last updated 3:06 AM on 9/19/26
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12 Terms

1
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rain, greater than 0.5mm, above freezing

large drops of liquid water that fall from the sky, where the diameter of each droplet is [greater/less than #.#mm]. On soundings, its temperature profile is constantly [term term] throughout, producing liquid precipitation.

<p>large drops of liquid water that fall from the sky, where the diameter of each droplet is [greater/less than #.#mm]. On soundings, its temperature profile is constantly [term term] throughout, producing liquid precipitation. </p>
2
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drizzle, less than 0.5mm

small drops of liquid water that fall from the sky, where the diameter of each droplet is [greater/less than #.#mm]

<p>small drops of liquid water that fall from the sky, where the diameter of each droplet is [greater/less than #.#mm]</p>
3
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virga

rain (liquid precipitation) that evaporates before it hits the ground, appears as streaks of precipitation coming out

<p>rain (liquid precipitation) that evaporates before it hits the ground, appears as streaks of precipitation coming out</p>
4
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graupel / snow pellets

5
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freezing rain

precipitation that begins its life cycle in the upper atmosphere as snow, melts into rain, cools in a shallow freezing layer as it nears the surface, then freezes as it hits the surface

<p>precipitation that begins its life cycle in the upper atmosphere as snow, melts into rain, cools in a shallow freezing layer as it nears the surface, then freezes as it hits the surface</p>
6
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sleet

precipitation that begins its life cycle in the upper atmosphere as snow, melts into rain, then freezes into small pellets in a deep freezing layer before it hits the ground

<p>precipitation that begins its life cycle in the upper atmosphere as snow, melts into rain, then freezes into small pellets in a deep freezing layer before it hits the ground</p>
7
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snow

precipitation frozen into crystalline shapes

<p>precipitation frozen into crystalline shapes </p>
8
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condensation / deposition, collision/coalescence, ice-crystal process

the three ways condensation nuclei grow are:

[term] / [term]

[term] / [term]

[term-term process]

9
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2mm

raindrops are [#mm] in size

10
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0.02mm

cloud droplets are [#.##mm] in size

11
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0.0002mm

condensation nuclei are [#.####mm]

12
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=, decreases, condensation, evaporation

when RH = 100% — when the rate of evaporation [x] the rate of condensation — and temperature [terms], there will be more [term] than [term], causing more water to condense. This takes a looong time.