Wiktionary
n. (context meteorology English) An occluded front occurs when a cold front overtakes a warm front at the surface and a temperature contrast exists between the advancing and retreating cold air masses.
WordNet
n. (meteorology) a composite front when colder air surrounds a mass of warm air and forces it aloft [syn: occlusion]
Wikipedia
An occluded front is formed during the process of cyclogenesis when a cold front overtakes a warm front. When this occurs, the warm air is separated (occluded) from the cyclone center at the Earth's surface. The point where the warm front and the occluded front meet (and consequently the nearest location of warm air to the center of the cyclone) is called the triple point.
The trowal (short for TROugh of Warm air ALoft) is the projection on the Earth's surface of the trough of warm air aloft formed during the occlusion process of the depression.
Usage examples of "occluded front".
Already he found himself forgetting that something like an occluded front seemed to have swept over his memories of Sylvie, which he had thought as hard and changeless as anything he owned, but which when he touched them now seemed to have turned to autumn leaves like fairy gold, turned to wet earth, staghorn, snails' shells, fauns' feet.
He hadn't been able to sleep on the plane, tossed with nocturnal thunderstorms along an occluded front.
God, Rawcliff thought, I wouldn't like to have him as a copilot - heading into an occluded front with the R/T cutting out, heavy icing, oil-pressure dropping on Number Two engine.