The first Advanced Microwave Sounding Unit (AMSU) was launched on NOAA-K on May 13, 1998. Compared to its predecessor, the Microwave Sounding Unit (MSU), it has better calibration, higher spatial resolution, lower noise, and more channels. It will enable the routine monitoring of global temperatures within 11 layers, from the lower troposphere to the upper stratosphere. Because its many channels have heavily overlapping weighting functions, the AMSU design has enabled limb corrections to be performed that have averaging kernels which closely match the nadir-view weighting functions. This will allow more accurate monitoring of regional temperature variations at short time scales. Examples of the products will be presented