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Mobile Sounding Observations of a Thunderstorm near the Dryline: The Gruver, Texas Storm Complex of 25 May 1987

Abstract During the afternoon of 25 May 1987, thunderstorms, some of which were tornadic and produced large hail, formed near a dryline in the Texas Panhandle. This note discusses a sounding released into the updraft of a developing cumulonimbus south of Gruver, Texas by a University of Oklahoma storn-intercept team. The sounding indicated a nearly pseudo-moist-adiabatic lapse rate, a temperature excess of 4°–6°C over the environment at 500 mb, and updraft speeds of 35–40 m s−1between 6 and 7 km AGL, in good agreement with parcel theory. A radar-observed fine line appeared along the dryline and retreated westward, as was also noted in two earlier case studies.