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54 Abbreviations CG--cloud to ground lightning NASA--National Aeronautics and Space Administration CONUS--continental United States NCAR--National Center for Atmospheric Research DoD--Department of Defense NLDN--National Lightning Detection Network EFIDS--electronic flight information display NOAA--National Oceanic and Atmospheric Administration EFM--electric field mill NTSB--National Transportation Safety Board FAA--Federal Aviation Administration OCC--operations control center GLM--geostationary lightning mapper OSHA--Occupational Safety and Health Administration GPS--global positioning system OTD--optical transient detector IC--inter- and intra-cloud PLWS--Precision Lightning Weather System IR--infrared RAD--remote alarm display ITWS--integrated terminal weather system RF--radio frequency JDPO--Joint Planning and Development Office TDWR--Terminal Doppler Weather Radar LDSS--lightning decision support system TOA--time of arrival LF--low frequency TRACON--terminal radar control center LIS--lightning imaging sensor USPLN--U.S. Precision Lightning Network MADS--master alarm distribution system VHF--very high frequency MDF--magnetic direction finding VLF--very low frequency MF--medium frequency WSSDM--Weather Support for Deicing Decision Making