Airmass — For air mass in meteorology, see air mass .In astronomy, airmass is the optical path length through Earth s atmosphere for light from a celestial source.As it passes through the atmosphere, light isattenuated by scattering and absorption; the… … Wikipedia
airmass source region — noun An extensive area of the earths surface over which bodies of air frequently remain for a sufficient time to acquire characteristic temperature and moisture properties imparted by that surface. Air so modified becomes identifiable as a… … Wiktionary
airmass — air mass n. A large body of air with only small horizontal variations of temperature, pressure, and moisture. * * * … Universalium
Geography of Nigeria — Satellite image of Nigeria Nigeria is a country in West Africa. Nigeria shares land borders with the Republic of Benin in the west, Chad and Cameroon in the east, and Niger in the north. Its coast lies on the Gulf of Guinea in the south and it… … Wikipedia
Convective instability — For a more general discussion of the same phenomenon, see Convective available potential energy. This article incorporates public domain text created by the US government. In meteorology, convective instability or stability of an airmass refers… … Wikipedia
Cloud — For other uses, see Cloud (disambiguation). Cumulus cloudscape over Swifts Creek, Australia A cloud … Wikipedia
List of cloud types — Clouds are formed in Earth s atmosphere when water evaporates into vapor from oceans, lakes, and ponds or by evapotranspiration over moist areas of Earth s land surface. The vapor rises up into colder areas of the atmosphere due to convective,… … Wikipedia
Air mass — For other uses, see Air mass (astronomy) and Air mass (solar energy). Different air masses which affect North America, as well as othe … Wikipedia
Dynamic soaring — is a flying technique used to gain energy by repeatedly crossing the boundary between air masses of significantly different velocity. Such zones of high wind gradient are generally found close to obstacles and close to the surface, so the… … Wikipedia
Cyclogenesis — The initial frontal wave (or low pressure area) forms at the location of the red dot on the image. It is usually perpendicular (at a right angle) to the leaf like cloud formation (baroclinic leaf) seen on satellite during the early stage of… … Wikipedia
