ATM OCN 100: Chapter 12
14 Cards in this Set
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cold air damming
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process by which cold, dry air is forced against the east side of the Appalachian Mountains when strong onshore flow is present from the Atlantic Ocean
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cold air trapping
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process by which cold air is trapped in the valleys of the Appalachian Mountains while warm air advances northward on either side of the Appalachian
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freezing drizzle
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light misty precipitation droplets with diameters between .2 and .5 mm that freeze on contact with the surface
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ice nuclei
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particles that promote the formation of ice crystals in air or in liquid water; particles generally have a crystalline structure similar to ice
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ice pellets
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liquid drops that have frozen or refrozen; referred to as sleet
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ice storm
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a winter storm in which there is substantial accumulation of freezing rain or freezing drizzle at the surface
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inversion
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an increase of temperature with altitude; represents the opposite of the more common tropospheric situation in which temperature decreases with altitude
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melting level
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the altitude at which falling precipitation changes from the ice phase to liquid drops
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melting process
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the formation of freezing precipitation when snowflakes fall into an atmospheric layer in which the temperature exceeds 0 degrees and continue their fall back into a sub-freezing below 0 celsius layer of air near ground
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sleet
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precipitation consisting of frozen raindrops
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supercool
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the process by which water is cooled to a temperature lower than zero degrees but remains in the liquid state
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supercooled warm rain process
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the process by which tiny cloud droplets in a subfreezing cloud grow to precipitation size by colliding and coalescing with each other
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supercooled water
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water that has a temperature below 0 degrees celsius but is in a liquid state
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warm rain
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rain that forms in the absence of ice particles
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ATM OCN 100: Final Exam