A Study of Updraft-Downdraft Interaction Based on Perturbation Pressure and Single-Doppler Radar Data

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  • 1 Air Weather Service, Scott AFB, Ill. 62225
  • | 2 Saint Louis University, St. Louis, Mo. 63103
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Abstract

Perturbation pressure typical of the lowest 5 km of supercell severe thunderstorms was calculated from a composite of single Doppler radar and conventional data from various storms. Most of the data was taken from the 24 May 1973 Union City, Okla., case and gaps were filed with data from the 19 April 1972 Davis, Okla., case and others. Horizontal flow, equivalent radar reactivity factor, vertical velocity and perturbation pressure were compared in three dimensions to explain how updrafts and downdrafts can cooperate in the storm's lower portion (0–6 km) during its mature stage to maintain supercell structure.

Abstract

Perturbation pressure typical of the lowest 5 km of supercell severe thunderstorms was calculated from a composite of single Doppler radar and conventional data from various storms. Most of the data was taken from the 24 May 1973 Union City, Okla., case and gaps were filed with data from the 19 April 1972 Davis, Okla., case and others. Horizontal flow, equivalent radar reactivity factor, vertical velocity and perturbation pressure were compared in three dimensions to explain how updrafts and downdrafts can cooperate in the storm's lower portion (0–6 km) during its mature stage to maintain supercell structure.

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