The Dynamics of Updraft Vaults in Hailstorms as Inferred from the Entraining Jet Model

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  • 1 Naturai Resources Research Institute, University of Wyoming, Laramie
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Abstract

The one-dimensional steady-state entraining jet model of cumulonimbus by Squires and Turner was applied to the updraft vaults of 11 hailstorms which occurred in Nebraska and Alberta during July 1968. The initial conditions of cloud base temperature, height, updraft speed and radius were directly observed from an aircraft flying in the updrafts at cloud base. Environmental soundings of temperature and mixing ratio were obtained for each storm from nearby radiosonde observations.

The storm tops as estimated from the radar were within ±1.4 km of the model tops. The radii of the echo free vaults were within ±1 km of the model radii in the lower half of the storm. The significance of the other parameters predicted by the model are discussed.

Abstract

The one-dimensional steady-state entraining jet model of cumulonimbus by Squires and Turner was applied to the updraft vaults of 11 hailstorms which occurred in Nebraska and Alberta during July 1968. The initial conditions of cloud base temperature, height, updraft speed and radius were directly observed from an aircraft flying in the updrafts at cloud base. Environmental soundings of temperature and mixing ratio were obtained for each storm from nearby radiosonde observations.

The storm tops as estimated from the radar were within ±1.4 km of the model tops. The radii of the echo free vaults were within ±1 km of the model radii in the lower half of the storm. The significance of the other parameters predicted by the model are discussed.

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