A high spectral resolution geostationary sounder can make spectrally detailed measurements of the infrared spectrum at high temporal resolution that provides unique information about the lower tropospheric temperature and moisture structure. Within the infrared window region, many spectrally narrow, relatively weak water vapor absorption lines and one carbon dioxide absorption line exist. Frequent measurement of these absorption lines can provide critical information for monitoring the evolution of the lower tropospheric thermodynamic state. This can improve short-term convective forecasts by monitoring regions of changing atmospheric stability. While providing valuable observations, the current geostationary sounders are spectrally broad and average over the important spectrally narrow absorption lines needed to observe the planetary boundary layer. The usefulness of high spectral resolution measurements from polar orbiting instruments has been shown in the literature, as has the usefulness of high temporal resolution measurements from geostationary instruments. But little attention has been given to the combination of high temporal (geostationary), along with high spectral resolution measurements. This paper demonstrates through use of high temporal, high spectral resolution infrared radiances the potential utility of these measurements.