Definition of orographic in US English:



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

    • ‘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.’
    • ‘It's an elongated depression between orographic protuberances.’
    1. 1.1 (of clouds or rainfall) resulting from the effects of mountains in forcing moist air to rise.
      • ‘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.’
      • ‘These types of clouds are called "orographic clouds", which develop in response to lifting forced by the topography the earth.’
      • ‘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.’