Backtrajectories are calculated with the NOAA HYSPLIT 3.2 code using the Australian Bureau of Meteorology (ABoM) GASP model. This model has approximately 5 degree horizontal resolution and 18 levels in the vertical. These data are then interopolated onto omega fields for use with HYSPLIT. For each series of trajectories we provide an ASCII file which contains the time, lat, lon, pressure, U, V, vertical velocity in pressure, temperature, relative humidity and surface pressure. These fields come from the GASP data set. Trajectories will fail if the track hits the surface, rises above approx 500 HPa or flows off the restricted domain of the GASP data. Also, the lowest interpolated GASP data is to the 0.991 omega level. This corresponds to roughly 110 meters height. Trajectories below this level are not accurate. Most likely they will be moving too quickly as they do not reflect the physics of the surface drag on the air flow. They still provide a good estimate of the air motion for the first 12-24 hours. These back trajectories are designed to aid in the analysis of the Discoverer and Southern Surveyor observations. In these files, the 00Z and 12Z daily 5-day backtrajectories may be located for the period of 15 Nov through 12 Dec 1995. Each series of trajectories has source altitudes of 100m, 500m and 2000m. Please contact steve siems (s.siems@sci.monash.edu.au) regarding questions.