IDEALS Home University of Illinois at Urbana-Champaign logo The Alma Mater The Main Quad

Internal vs. External Forcings in Supercell Interactions and Their Impact on Storm Morphology and Intensity

Show simple item record

Bookmark or cite this item: http://hdl.handle.net/2142/31118

Files in this item

File Description Format
PDF Syrowski_Ann.pdf (16MB) (no description provided) PDF
Title: Internal vs. External Forcings in Supercell Interactions and Their Impact on Storm Morphology and Intensity
Author(s): Syrowski, Ann
Advisor(s): Wilhelmson, Robert B.
Department / Program: Atmospheric Sciences
Discipline: Atmospheric Sciences
Degree Granting Institution: University of Illinois at Urbana-Champaign
Degree: M.S.
Genre: Thesis
Subject(s): Supercells Mergers Interactions Tornadoes
Abstract: This study examines supercell interactions from a suite of fifty-two idealized numerical simulations. The relative positions of two storm cells are varied for each case, and a single-cell simulation serves as the control. Despite initializing each simulation with an identical convective available potential energy and wind shear profile, small changes in the initial cell pair orientation lead to significant changes in subsequent storm morphology. Ninety-eight percent of the two-cell storm simulations produce stronger low-level mesocyclones than the single-cell control case, and low-level mesocyclone intensification is coupled with unsteady downdraft bursts in the forward flank. Downburst-driven, surface-based circulation centers form along the forward flank gust front, propagate toward the main updraft, and are stretched immediately prior to mesocyclogenesis events. These discrete rotation centers are approximately one kilometer deep and would most often be unobserved by operational radar. The external forcing associated with the initial storm cell pair orientation modulates the frequencies of the internal downbursts that drive the intensification of the low-level mesocyclone.
Issue Date: 2012-05-22
URI: http://hdl.handle.net/2142/31118
Rights Information: Copyright 2012 Ann M. Syrowski
Date Available in IDEALS: 2012-05-22
Date Deposited: 2012-05
 

This item appears in the following Collection(s)

Show simple item record

Item Statistics

  • Total Downloads: 37
  • Downloads this Month: 0
  • Downloads Today: 0

Browse

My Account

Information

Access Key