Editorial Type:
Article
Article Type:
Research Article

Precipitation Properties Observed during Tropical Cyclone Intensity Change

George R. Alvey III Department of Atmospheric Sciences, University of Utah, Salt Lake City, Utah

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Jonathan Zawislak Department of Earth and Environment, Florida International University, Miami, Florida

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Edward Zipser Department of Atmospheric Sciences, University of Utah, Salt Lake City, Utah

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Print Publication:
01 Nov 2015
DOI:
https://doi.org/10.1175/MWR-D-15-0065.1
Page(s):
4476–4492
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Abstract

Using a 15-yr (1998–2012) multiplatform dataset of passive microwave satellite data [tropical cyclone–passive microwave (TC-PMW)] for Atlantic and east Pacific storms, this study examines the relative importance of various precipitation properties, specifically convective intensity, symmetry, and area, to the spectrum of intensity changes observed in tropical cyclones. Analyses are presented not only spatially in shear-relative quadrants around the center, but also every 6 h during a 42-h period encompassing 18 h prior to onset of intensification to 24 h after. Compared to those with slower intensification rates, storms with higher intensification rates (including rapid intensification) have more symmetric distributions of precipitation prior to onset of intensification, as well as a greater overall areal coverage of precipitation. The rate of symmetrization prior to, and during, intensification increases with increasing intensity change as rapidly intensifying storms are more symmetric than slowly intensifying storms. While results also clearly show important contributions from strong convection, it is concluded that intensification is more closely related to the evolution of the areal, radial, and symmetric distribution of precipitation that is not necessarily intense.

Corresponding author address: George R. Alvey III, 135 S 1460 E, Rm. 806B, Salt Lake City, UT 84112. E-mail: g.alvey@utah.edu

Abstract

Using a 15-yr (1998–2012) multiplatform dataset of passive microwave satellite data [tropical cyclone–passive microwave (TC-PMW)] for Atlantic and east Pacific storms, this study examines the relative importance of various precipitation properties, specifically convective intensity, symmetry, and area, to the spectrum of intensity changes observed in tropical cyclones. Analyses are presented not only spatially in shear-relative quadrants around the center, but also every 6 h during a 42-h period encompassing 18 h prior to onset of intensification to 24 h after. Compared to those with slower intensification rates, storms with higher intensification rates (including rapid intensification) have more symmetric distributions of precipitation prior to onset of intensification, as well as a greater overall areal coverage of precipitation. The rate of symmetrization prior to, and during, intensification increases with increasing intensity change as rapidly intensifying storms are more symmetric than slowly intensifying storms. While results also clearly show important contributions from strong convection, it is concluded that intensification is more closely related to the evolution of the areal, radial, and symmetric distribution of precipitation that is not necessarily intense.

Corresponding author address: George R. Alvey III, 135 S 1460 E, Rm. 806B, Salt Lake City, UT 84112. E-mail: g.alvey@utah.edu
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