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

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  • 1 School of Meteorology, University of Oklahoma, Norman, Oklahoma
  • | 2 National Severe Storms Laboratory, Normal Oklahoma
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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.

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.

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