Dropsonde data are high-accuracy, high-vertical-resolution data collected from dropwindsondes  deployed from reconnaissance research aircraft. Aircraft from Atmospheric River (AR) Reconnaissance campaign deploy dropsondes data in the upper troposphere or near the tropopause. These data include meteorological variables that are essential to observing and modeling atmospheric structures. Research showed that these dropsondes data can influence data assimilation via direct impact on the intial conditions and indirect impact on the model background and satellite bias correction.