The structure of the wind field of a tropical cyclone can be roughly described by three measurements: intensity (maximum wind), size (extent of the vortex), and strength (average wind speed of the vortex). This paper examines the climatology, structure and possible physical processes of tropical cyclones of different sizes.

A composite based on the phase of the 30-60 day oscillation (referred to as the Madden-Julian Oscillation or MJO) is used to examine kinematic and thermodynamic fields over the equatorial western Pacific Ocean for the Northern Hemisphere winter seasons (1986-89).

This paper discusses one to two day future tropical cyclone intensity change from both a composite and an individual case point-of-view. Tropical cyclones occurring in the Gulf of Mexico during the period 1957-1977 form the primary data source.

Hurricane spawned tornadoes are most frequent at the time when hurricanes initially cross land and undergo rapid filling. This paper presents data composite information on all available rawinsonde and pibal reports surrounding this type of tornado genesis in the United States and Japan.

A linear theory is given for the case of steady thermal convection in a stratified fluid with a general thermal boundary condition at the upper and lower limits of the system. The theory is applied to a number of fluid systems and the results are discussed in terms of the Rayleigh number, the horizontal wave number and the vertical velocity and temperature perturbation profiles in the vertical.

Some results are presented from a completed first stage of a collaborative Colorado State University/Australian Bureau of Meteorology project to investigate various aspects of tropical cyclones in the Australian/southwest Pacific region.