ITOP USAF C-130 Flight Level Data Version 2.0 Information NOAA/AOML/HRD has reprocessed all SFMR data using a new algorithm based off of Klotz and Uhlhorn, 2014 (hereafter KU2014). The updated algorithm improves the separation of the wind and rain in the microwave signal in order to reduce a high wind speed bias at wind speeds below ~60 kt. In so doing, rain rates are also more representative within the instrument limitations. A low bias in the strong wind speeds (> 120 kt) is reduced as well. This Version 2.0 of the USAF C-130 Flight Level Data contains the original flight level data files (*.01SEC.txt). The SFMR data included within these files was processed with the original algorithm based off of Uhlhorn et al (2007). Additional files containing the SFMR data processed using the revised KU2014 algorithm are included with this version 2.0 (AFRC_SFMR*nc). It is recommended that users interested in the SFMR parameters use the data from the new KU2014 files. No issues have been noted with the other parameters included in the original flight level data files. If you have any questions about the KU2014 data processing please contact Brad Klotz (brad.klotz@noaa.gov). References Klotz, B. W., and E. W. Uhlhorn, 2014: Improved stepped frequency microwave radiometer tropical cyclone surface winds in heavy precipitation. J. Atmos. Oceanic Technol., 31, 2392–2408, doi:https://doi.org/10.1175/JTECH-D-14-00028.1. Uhlhorn, E. W., P. G. Black, J. L. Franklin, M. Goodberlet, J. Carswell, and A. S. Goldstein, 2007: Hurricane surface wind measurements from an operational stepped frequency microwave radiometer. Mon. Wea. Rev., 135, 3070–3085, doi:https://doi.org/10.1175/MWR3454.1.