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K changes—The K process is generally viewed as a recoil streamer or small return stroke that occurs when a propagating discharge within the cloud encounters a pocket of charge opposite to its own. In this view, the J process represents a slowly propagating discharge that initiates the K process. This is the case for K changes in cloud discharges. It is reasonable to expect that cloud discharge K changes are similar to the in-cloud portion of ground discharges.
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K process—The return propagation of charge along a channel in a cloud in response to the initial breakdown streamer contacting a region of opposite charge. In this context it can be viewed as a small return stroke in the cloud. See K changes.
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K theory—(Also called mixing-length theory.) A method of describing the movement of trace species on the turbulent or subgrid scale. The theory relates the fluxes of the trace species to the gradient of the mean quantities via the eddy diffusivity (denoted K). See also turbulent flux.
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kaavie—In Scotland, a heavy fall of snow.
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kachchan—A hot, dry, west or southwest wind of foehn type in the lee of the Sri Lanka hills during the southwest monsoon in June and July. It is well developed at Batticaloa on the east coast, where it is strong enough to overcome the sea breeze and bring maximum temperatures of nearly 38°C.
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