Over the past several years, several agencies have explored the development of tropical cyclone (TC) intensity estimation techniques based on NOAA-KLM series Advanced Microwave Sounding Unit (AMSU) warm core observations (Spencer and Braswell, 2001; Brueske and Velden, 2001; Demuth and Vonder Haar, 2001). Each technique is unique in approach although most are based on underlying principles of hydrostatic and gradient wind balance for an axisymmetic warm core. In this paper, the authors compare the results of two AMSU-based TC intensity estimation techniques to identify factors that limit any single algorithm and, if combined, may potentially lead to improved future capabilities. Plans are currently underway to merge the CIMSS and CIRA algorithms as part of the United States Weather Research Program (USWRP) Joint Hurricane Tested program with the goal of transitioning and executing CIMSS/CIRA AMSU processing in-house during 2002.