The NASA Water Vapor Project (NVAP) dataset is a global, daily, multilayer and total column, satellite-derived water vapor dataset that currently covers the time period from 1988 – 2001. This paper will discuss significant interannual variability and noteworthy variations on shorter timescales. Maps of the daily change in layered and precipitable water vapor, both in absolute and relative terms, are presented. They highlight regions where atmospheric moisture is most variable, such as midlatitude storm tracks and adjacent to the ITCZ. Examination of the water vapor record on longer timescales indicates different atmospheric processes such as the monsoons and ENSO. The NVAP dataset does not show a convincing global trend of water vapor. There are however significant regional trends during this time period. Extension of the NVAP dataset beyond 2001 and synergy with other global climate datasets (clouds, precipitation, global temperature) will be discussed.