Lightning flash counts and rates across the global tropics and subtropics are obtained using the Tropical Rainfall Measuring Mission (TRMM) Lightning Imaging Sensor (LIS), and then compared to 3-hourly reanalysis data from MERRA2 for the period between 1997 and 2015. Environmental fields of interest include multiple formulations of CAPE since it varies based on the estimation of the lifting condensation level, column saturation fraction (representing the column-integrated atmospheric moisture), and omega at different atmospheric levels. The lightning and reanalysis data will be analyzed at three grid resolutions (0.5, 1, and 2.5°) to determine if there is scale sensitivity to the lightning-environmental relationships. Land vs ocean correlations will also be thoroughly investigated since lightning and thunderstorm properties are very different depending on the surface over which they occur. For example, preliminary results show that almost all lightning over land occurs at high column saturation fraction (between 0.8 and 0.9), while there is no obvious pattern between column saturation fraction and flash counts over ocean. The correlation of TRMM lightning data and these environmental parameters will give insight to what conditions are the best predictors of lightning events.