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   Wadati-Benfoff zone  
Subject: Geology
    The narrow zone of inclined seismic activity that extends from a trench downward into the asthenosphere. Reference:Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
   Walker cell   
Subject: The Earth
    A zonal circulation of the atmosphere confined to equatorial regions and driven principally by the oceanic temperature gradient. In the Pacific, air flows westward from the colder, eastern area to the warm, western ocean, where it acquires warmth and moisture and subsequently rises. A return flow aloft and subsidence over the eastern ocean complete the cell.
 
 
  
   wall cloud  
Subject: The Earth
    An area of rotating clouds that extends beneath a severe thunderstorm and from which a funnel cloud may appear. Also called a collar cloud.
 
 
  
   warm advection   
Subject: The Earth
    Transport of warm air into an area by winds.
 
 
  
   warm clouds  
Subject: The Earth
    Clouds that form at temperatures above freezing.
 
 
  
   warm front  
Subject: The Earth
    A front that moves in such a way that warm air replaces cold air.
 
 
  
   warm occlusion  
Subject: The Earth
    See occluded front.
 
 
  
   warm sector  
Subject: The Earth
    The region of warm air within a wave cyclone that lies between a retreating warm front and an advancing cold front.
 
 
  
   warm-core low  
Subject: The Earth
    A low-pressure area that is warmer at its center than at its periphery. Tropical cyclones exhibit this temperature pattern.
 
 
  
   Warping  
Subject: The Earth
    Warping- is a method which can overcome some of the problems of edge matching . It can also be used to resolve registration problems arising from digitizing source maps of different scales, different projections, and varying coordinate systems.
 
 
  
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