Now showing items 1-4 of 4

    • The multiple vortex nature of tropical cyclogenesis 

      Sippel, Jason Allen (Texas A&M University, 2005-02-17)
      This thesis contains an observational analysis of the genesis of Tropical Storm Allison (2001). Using a paradigm of tropical cyclone formation as the superposition of potential vorticity (PV) anomalies, the importance of ...
    • Piecewise Tendency Diagnosis of Dynamical Processes Governing the Development of an Upper-Tropospheric Mobile Trough 

      Nielsen-Gammon, John; Lefevre, Randy (American Meteorological Society, 1996-11-01)
      The intensification and evolution of midlatitude upper-tropospheric mobile troughs may be viewed in terms of the isentropic advection and deformation of the tropopause potential vorticity gradient. The potential vorticity ...
    • Using Tropopause Maps to Diagnose Midlatitude Weather Systems 

      Morgan, Michael; Nielsen-Gammon, John (American Meteorological Society, 1998-10-01)
      The use of potential vorticity (PV) allows the efficient description of the dynamics of nearly balanced atmospheric flow phenomena, but the distribution of PV must be simply represented for ease in interpretation. ...
    • A Visualization of the Global Dynamic Tropopause 

      Nielsen-Gammon, John (American Meteorological Society, 2001-06-01)
      A 20–yr loop of the global tropopause, defined in terms of potential vorticity (PV), is constructed using the NCEP–NCAR reanalysis dataset. This method of visualizing observed upper–tropospheric dynamics is useful for ...