Der Große Muret-Sanders:
warm front s (Meteorologie) Warm(luft)front f
Harper Collins German Unabridged Dictionary:
Warmfront f (Met) warm front
Oxford Duden German Dictionary
Warmfront die (Met.) warm front
Hartmut Leser, Diercke Wörterbuch Allgemeine Geographie:
Warmfront: Grenzfläche zwischen klater und warmer Luft auf der Vorderseite des Warmluftsektors einer Zyklone. Die W. ist als schräg stehende, mächtige Aufgleitfläche entwicklet. Abkühlung der Warmluft am Kontakt zur Kaltluft bewirkt intensive Kondesationsvorgänge und oft andauernde Regen aus tiefhängeden Schichtwolken.
This so-called Bergen school, founded by Vilhelm Bjerknes, formulated a model for a cyclone that forms as a disturbance along a zone of strong temperature contrast known as a front, which in turn constitutes a boundary between two contrasting air masses. [...] As the pressure within the disturbance continues to decrease, the disturbance assumes the appearance of a small cyclone and forces northward and southward movements of warm and cold air, respectively, which are represented by mobile frontal boundaries. As depicted in 4C , the front that signals the advancing cold air (cold front) is indicated by the triangles, while the front corresponding to the advancing warm air (warm front) is indicated by the semicircles. As the cyclone continues to intensify (4D ), the cold, dense air streams rapidly southward, yielding a cold front with a typical slope of one to 50 and a propagation speed of eight to 15 metres per second (about 15 to 30 knots). At the same time, the warm, less dense air moving in a northerly direction flows up over the cold air east of the cyclone to produce a warm front with a typical slope of one to 200 and a much slower propagation speed of 2.5 to eight metres per second.