Definition of orographic in US English:



  • 1Relating to mountains, especially with regard to their position and form.

    • ‘It's an elongated depression between orographic protuberances.’
    • ‘The 925-mb pressure level surface at about 750 m a.s.l. would be closer to frequent bird migration altitudes but is more exposed to orographic distortions and often not available.’
    1. 1.1 (of clouds or rainfall) resulting from the effects of mountains in forcing moist air to rise.
      • ‘These types of clouds are called "orographic clouds", which develop in response to lifting forced by the topography the earth.’
      • ‘When there is an isolated peak, a banner cloud can form, which is a type of orographic cloud.’
      • ‘This wave cloud pattern formed off the Île Amsterdam in the far southern Indian Ocean, due to orographic lift of an airmass by the island.’
      • ‘Maximum precipitation values in Antarctica are found a short way inland at an altitude of about 1600 m, where orographic precipitation is greatest.’
      • ‘Hilly areas can get extra rainfall from what is known as the orographic effect which occurs where air is forced to rise over high ground, causing clouds followed by rain.’