On the Secondary Eyewall Formation of Hurricane Edouard (2014)
Loading...
Authors
Abarca, Sergio F.
Montgomery, Michael T.
Braun, Scott A.
Dunion, Jason
Subjects
ATMOSPHERIC CIRCULATION
ATMOSPHERIC TEMPERATURE
DROPSONDES
HURRICANES
METEOROLOGY
PRESSURE GRADIENTS
VERTICAL DISTRIBUTION
WIND (METEOROLOGY)
BOUNDARY LAYERS
CONVECTION
POSITION (LOCATION)
SENTINEL SYSTEM
VORTICITY
ATM/OCEAN STRUCTURE/ PHENOMENA
HURRICANES/TYPHOONS
OBSERVATIONAL TECHNIQUES AND ALGORITHMS
DROPSONDES
IN SITU ATMOSPHERIC OBSERVATIONS
ATMOSPHERIC TEMPERATURE
DROPSONDES
HURRICANES
METEOROLOGY
PRESSURE GRADIENTS
VERTICAL DISTRIBUTION
WIND (METEOROLOGY)
BOUNDARY LAYERS
CONVECTION
POSITION (LOCATION)
SENTINEL SYSTEM
VORTICITY
ATM/OCEAN STRUCTURE/ PHENOMENA
HURRICANES/TYPHOONS
OBSERVATIONAL TECHNIQUES AND ALGORITHMS
DROPSONDES
IN SITU ATMOSPHERIC OBSERVATIONS
Advisors
Date of Issue
2012-08
Date
Aug 22, 2016
Publisher
Language
Abstract
A first observationally-based estimation of departures from gradient wind balance during secondary eyewall formation is presented. The study is based on the Atlantic Hurricane Edouard (2014). This storm was observed during the National Aeronautics and Space Administrations (NASA) Hurricane and Severe Storm Sentinel (HS3) experiment, a field campaign conducted in collaboration with the National Oceanic and Atmospheric Administration (NOAA). A total of 135 dropsondes are analyzed in two separate time periods: one named the secondary eyewall formation period and the other one referred to as the decaying-double eyewalled storm period. During the secondary eyewall formation period, a time when the storm was observed to have only one eyewall, the diagnosed agradient force has a secondary maxima that coincides with the radial location of the secondary eyewall observed in the second period of study. The maximum spin up tendency of the radial influx of absolute vertical vorticity is within the boundary layer in the region of the eyewall of the storm and the spin up tendency structure elongates radially outward into the secondary region of supergradient wind, where the secondary wind maxima is observed in the second period of study. An analysis of the boundary layer averaged vertical structure of equivalent potential temperature reveals a conditionally unstable environment in the secondary eyewall formation region. These findings support the hypothesis that deep convective activity in this region contributed to spin up of the boundary layer tangential winds and the formation of a secondary eyewall that is observed during the decaying-double eyewalled storm period.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.1175/MWR-D-15-0421.1
Series/Report No
Department
Organization
Goddard Space Flight Center
Identifiers
NPS Report Number
Sponsors
Funder
NSF AGS-1313948; N0017315WR00048; NNG11PK021
Format
Citation
Monthly Weather Review; p. 3321-3331; (ISSN 0027-0644; e-ISSN 1520-0493); Volume 144; Issue 9
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.