Barotropic instability during eyewall replacement

Prior to landfall in Puerto Rico, Hurricane Maria (2017) underwent an eyewall replacement cycle. The National Oceanic and Atmospheric Administration (NOAA) San Juan (TJUA) radar captured a robust outer convective ring with an inner ring first distorted into an ellipse and then disintegrated. To understand the dynamical processes during eyewall replacement, this work interprets the eyewall replacement event using the non-divergent barotopic model with a linear stability analysis and non-linear numerical simulations. For the linear stability analysis, the model’s axisymmetric basic state vorticity distribution is piece-wise uniform in five regions: eye, inner eyewall, moat, outer eyewall, and far field. The stability of such structures is investigated by solving a simple eigenvalue/eigenvector problem. For the non-linear model, the evolution into a more stable structure is simulated using the non-linear barotropic model. Three types of instability and vorticity rearrangement are identifi..., Five-region linear stability analysis
Nondivergent barotropic model linear stability analysis results for a two-dimensional family of vortices, each having an axisymmetric basic state vorticity with a five-region piecewise uniform distribution. These results are for understanding which azimuthal wavenumber(s) will become unstable for each vortex in the family.
Nondivergent barotropic model
Output from a finite difference nondivergent barotropic model for tropical cyclones that uses high-order accurate discretization and MUDPACK. These results are for three specific vortices in which instability develops in the inner-eyewall region (Vortex B), in the outer-eyewall region (Vortex C), or across the moat between the two eyewalls (Vortex A).
NOAA NEXRAD TJUA radar
A loop from the NOAA NEXRAD TJUA radar centered on the position of Hurricane Maria (2017). The radar reflectivity (dBz) imagery includes every base scan starting at 05:42:01 UTC and ending at 09:50:00 UTC on 20 September 2017., , # Data for: Barotropic Instability During Eyewall Replacement

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The following dataset includes results and animations from the manuscript
\"Barotropic Instability During Eyewall Replacement\" by C. Slocum, R. K. Taft,
J. P. Kossin, and W. H. Schubert submitted to MDPI Meteorology,
https://doi.org/10.3390/meteorology2178224.

The work is motivated by the elliptically-distorted inner eyewall of Hurricane
Maria (2017) that was visible in the San Juan, Puerto Rico radar during a period
of concentric eyewalls. The work presents a simple interpretation of this event
in terms of the nondivergent barotropic model using both a linear stability
analysis and numerical simulations.

There are three components to this dataset:

1. Loop of the NOAA NEXRAD TJUA radar during the landfall of Hurricane Maria (2017)
2. Output from the five-region linear stability analysis
3. Output from the nondivergent barotropic model

### NOAA NEXRAD TJUA radar

A loop from the NOAA NEXRAD TJUA radar centered on the ...