Accession Number:

ADA275373

Title:

On the Origins of Low-Level Tornadic Circulations Within the Remnants of Hurricane Andrews

Descriptive Note:

Master's thesis

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s):

Report Date:

1993-09-01

Pagination or Media Count:

79.0

Abstract:

A literature review establishes a key characteristic of tornadic hurricane environments to be the highly sheared lowest 1500 m. The thesis proposes that the shear-produced horizontal vorticity is turned vertical mainly via vertical velocities induced by mass convergence in boundary layer wind-shift zones, rather than by buoyant updrafts. A two dimensional mass continuity and convective available potential energy analysis is performed on data from a profiler and acoustic sounder exposed to Hurricane Andrews tornadic remnants. This analysis suggests the presence of a convergence-produced 5 ms updraft at a wind-shift in the thermodynamically stable boundary layer of a tornadic rainband.

Subject Categories:

  • Meteorology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE