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The upper-air data were examined for a few cases of heavy rainstorms over Japan, in expection of finding internal gravity waves generated over the storm areas. Among the cases, there was one case where variations of temperature, relative humidity and horizontal wind velocity in the troposphere showed features of internal gravity waves in the downstream of heavy rainfall (*150mm/day) area. The horizontal and vertical wave lengths of the variations were *400km and *3km, respectively. The amplitudes of temperature, humidity and wind velocity variations were estimated as *2K, *20% and *4m/sec respectively. But, no wave-like variation was detected in geopotential height. The wave-like variations were not found from the observational data 12 hours later.

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During the week 29 October-4 November 1988, a Ground-based Atmospheric Profiling Experiment (GAPEX) was conducted at Den-ver Stapleton International Airport. The objective of GAPEX was to acquire and analyze atomspheric-temperature and moisture-profile data from state-of-the-art remote sensors. The sensors included a six-spectral-channel, passive Microwave Profiler (MWP), a passive, infrared High-Resolution Interferometer Sounder (HIS) that provides more than 1500 spectral channels, and an active Radio Acoustic Sounding System (RASS). A Cross-Chain Loran Atmospheric Sounding System (CLASS) was used to provide research-quality in situ thermodynamic observations to verify the accuracy and resolution characteristics of each of the three remote sensors. The first results of the project are presented here to inform the meteorological community of the progress achieved during the GAPEX field phase. These results also serve to demonstrate the excellent prospects for an accurate, continuous thermodynamic profiling system to complement NOAA's forthcoming operational wind profiler.