The Microwave Barometric and Radar Sounder (MBARS) WHyMSIE instrument is a combined active and passive microwave sensor that measures surface air pressure in the oxygen absorption V-band (64-70 GHz). It includes a cross-track steerable differential absorption radar (DAR) to estimate total atmospheric oxygen content and determine surface dry air pressure. It also provides hyperspectral radiometric temperature profiles to enable vertical pressure profiles. It has a footprint of 350 m at ER-2 aircraft flight altitudes and data are averaged into 0.1 s (approximately 20-m) bins. These data were collected during the Westcoast and Heartland Hyperspectral Microwave Sensor Intensive Experiment (WHyMSIE) field campaign. WHyMSIE aimed to capture a wide variety of thermodynamic, moisture, and planetary boundary layer regimes across a variety of surface types. Comparing observations from MBARS, other instruments, and with in situ observations of temperature and humidity will allow for scientific advancement of remote-sensing techniques into the hyperspectral microwave era and improved understanding of the planetary boundary layer at different measurement scales. These data are available in HDF-5 format from November 7, 2024 through November 13, 2024.