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PICTURE of the MONTH Observed Inner-Core Structural Variability in Hurricane Dolly

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PICTURE of the MONTH Observed Inner-Core Structural Variability in Hurricane Dolly 4066 MONTHLY WEATHER REVIEW VOLUME 140 PICTURE OF THE MONTH Observed Inner-Core Structural Variability in Hurricane Dolly (2008)* ERIC A. HENDRICKS Marine Meteorology Division, Naval Research Laboratory, Monterey, California BRIAN D. MCNOLDY Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida WAYNE H. SCHUBERT Colorado State University, Fort Collins, Colorado (Manuscript received 17 January 2012, in final form 22 June 2012) ABSTRACT Hurricane Dolly (2008) exhibited dramatic inner-core structural variability during a 6-h rapid in- tensification and deepening event just prior to making landfall in southern Texas at 1800 UTC 23 July. In particular, the eyewall was highly asymmetric from 0634–1243 UTC, with azimuthal wavenumber m 5 4–7 patterns in the eyewall radar reflectivity and prominent mesovortex and polygonal eyewall signatures. Evi- dence is presented that the most likely cause of the high-wavenumber asymmetries is a convectively modified form of barotropic instability of the thin eyewall potential vorticity ring. The rapid intensification and deepening event occurred while Dolly was in a favorable environment with weak deep-layer vertical wind shear and warm sea surface temperatures; however, the environmental conditions were becoming less fa- vorable during the period of rapid intensification. Therefore, it is plausible that the internal vortex dynamics were dominant contributors to the rapid intensification and deepening. 1. Introduction more common in hurricanes (i.e., TCs with maximum sustained surface winds greater than 64 kt) because One of the most important unsolved problems in the radial profile of PV typically has a maximum in the tropical meteorology today is tropical cyclone (TC) in- eyewall region, where PV is continually produced by tensity variability, including rapid intensification. It is diabatic heating. The barotropic or combined barotropic– widely known that TC intensity change is caused by baroclinic instability of the eyewall and subsequent environmental, oceanic, and internal dynamical factors mixing has been a topic of much recent interest (Schubert (Wang and Wu 2004). One such important internal pro- et al. 1999; Kossin and Schubert 2001; Kossin and Eastin cess is the dynamic instability of the eyewall potential 2001; Montgomery et al. 2002; Terwey and Montgomery vorticity (PV) annulus, its breakdown, and subsequent eddy 2002; Kossin et al. 2002; Nolan and Montgomery 2002; flux of PV from the eyewall into the eye. This instability is Nolan and Grasso 2003; Kossin and Schubert 2004; Kwon and Frank 2005; Rozoff et al. 2009; Hendricks et al. 2009; Hendricks and Schubert 2010). * Supplemental information related to this paper is available at Detailed observations of the inner-core evolution of the Journals Online website: http://dx.doi.org/10.1175/MWR-D- 12-00018.s1. TCs have been sparse because TCs generally exist over the open oceans. However, on aircraft reconnaissance missions, airborne radar data have shown that significant Corresponding author address: Eric A. Hendricks, Marine Me- teorology Division, Naval Research Laboratory, 7 Grace Hopper variability can exist in the eyewall region (Marks et al. Ave., Monterey, CA 93943. 1992; Reasor et al. 2000; Roux and Viltard 2004). Rarely E-mail: eric.hendricks@nrlmry.navy.mil are land-based Doppler radars able to capture intricate DOI: 10.1175/MWR-D-12-00018.1 Ó 2012 American Meteorological Society DECEMBER 2012 P I C T U R E O F T H E M O N T H 4067 FIG. 1. The track of Hurricane Dolly. Each gray dot is 6 h apart. The NHC best-track intensity is also given at a number of date–time groups. structural details of organized eyewalls, because the hur- Padre Island at 1800 UTC 23 July as a category-1 hurricane 2 ricane typically becomes disorganized as it approaches the with maximum winds of 75 kt (1 kt 5 0.5144 m s 1). Af- coast, and second because there is a relatively short ter landfall, Dolly weakened and moved along the Texas window of time prior to landfall that the storm is in radar and Mexico border. range. Such a rare event occurred in 2008, as Hurricane The National Hurricane Center (NHC) best-track Dolly approached the Texas coast. Unprecedented ob- intensity estimates are shown in Fig. 2. These intensity servations of the inner core of Dolly were taken from the estimates are based in part upon multiple aircraft re- National Weather Service Weather Surveillance Radar- connaissance missions that were conducted in Dolly 1988 Doppler (WSR-88D) in Brownsville, Texas, prior from both the National Oceanic and Atmospheric Ad- to landfall. The observations showed a dynamic eyewall ministration (NOAA) WP-3D and the U.S. Air Force with significant azimuthal variability on short times (USAF) Reserve 53rd Weather Reconnaissance Squad- scales (30 min to 1 h) during a 6-h rapid intensification ron WC-130J aircraft. The vertically oriented solid black and deepening period beforeitmadelandfall.The line indicates the landfall time, and the gray-shaded area purpose of this note is to document this dramatic indicates the period of significant eyewall asymmetries, variability and to understand its role in the intensity variability of Dolly prior to landfall. This note is orga- nized as follows. A brief synoptic history of Dolly is provided in section 2. An environmental analysis is provided in section 3. Analysis of the observed inner- core structural variability, along with numerical model simulations, are given in section 4. A summary is pro- vided in section 5. 2. Synoptic history ThesynoptichistoryofDollyisprovidedbyPasch and Kimberlain(2011), and the track is given in Fig. 1. Dolly’s origin can be traced to a tropical wave exiting Africa on 11 July 2008; however, it did not form into FIG. 2. Intensity of Hurricane Dolly by maximum sustained wind a tropical storm until 20 July, when it was in the western and minimum central pressure. The landfall time is marked by the solid black line and the gray-shaded area denotes the time period Caribbean Sea. After crossing the Yucatan peninsula at with dramatic eyewall structural variability. Note the extra obser- 1200 UTC 21 July, it moved westward toward southern vation at 1400 UTC 23 Jul from the U.S. Air Force WC-130J re- Texas and slowed down. Dolly made landfall in South connaissance aircraft. 4068 MONTHLY WEATHER REVIEW VOLUME 140 which is the focus of this note. Prior to 1200 UTC 22 July, low- to midlevel relative humidity decreased from 0000 to Dolly had a steady intensity of approximately 40–45 kt. 0600 UTC 23 July (from 67% to 62%), then increased From 1200 UTC 22 July until approximately 1400 UTC from 0600 to 1200 UTC 23 July (from 62% to 69%). 23 July, Dolly experienced rapid intensification, during Synthesizing the above results, the environment was very which the maximum sustained wind increased from 45 to favorable for intensification between 1200 UTC 22 July 85 kt, and the minimum pressure fell from 990 to 965 hPa. and 0000 UTC 23 July. The SSTs were greater than 298C, 2 A significant portion of this rapid intensification oc- the deep-layer shear was approximately 3 m s 1,and curred in the 6-h time frame between 0600 and 1200 UTC strong upper-level divergence existed. The environment 23 July (gray-shaded area). In this short time period the became less favorable from 0000 to 1200 UTC 23 July. maximum sustained winds increased from 70 to 85 kt, The SSTs decreased to 28.98C on average, the deep-layer 2 and the pressure fell from 982 to 963 hPa. The rapid in- shear increased to 6 m s 1, and the upper-level di- tensification event occurred just prior to Dolly making vergence decreased significantly. landfall in southern Texas. During the period of interest here (gray-shaded area of Figs. 3a and 3b), when Dolly was rapidly intensifying and 3. Environmental analysis deepening with prominent eyewall asymmetries, the envi- ronmental conditions were generally becoming less favor- To help understand the relative roles of the internal able. From the four important environmental parameters and environmental processes in the rapid intensification examined, all except the midlevel relative humidity were and deepening of Dolly prior to landfall, analysis of the becoming less favorable for intensification. Therefore, it is environmental conditions in the vicinity of Dolly are possible that the rapid intensification and deepening event presented here. Four critical environmental parameters may have been more strongly controlled by the vortex in- for tropical cyclone intensity change are the deep-layer ternal dynamics than the environmental conditions for this vertical wind shear, sea surface temperature (SST), low- case. This is explored in the next section. to midlevel relative humidity, and upper-level divergence. A brief review of how each of these factors modulates 4. Inner-core analysis TC intensity is discussed in section 2c of Hendricks et al. a. Observed eyewall evolution (2010), and a more extensive review is provided by Wang and Wu (2004). These environmental parameters were The observed inner-core evolution of Dolly was cap- obtained from the Statistical Hurricane Intensity Pre- tured by the National Weather Service Doppler radar diction System (SHIPS) database (DeMaria et al. 2005) located in Brownsville, Texas (station identifier: KBRO). during the period just prior to landfall. The atmospheric In Fig. 4, the base radar reflectivity from KBRO is shown parameters are calculated using the Global Forecast from 0400 to 1400 UTC 23 July, which is during the rapid System (GFS) operational analysis. The SHIPS database intensification and deepening event. Radar images are parameters used were (i) SHRD: magnitude of the deep- shown every 2 h, and a time series of best-track intensity layer 850–200-hPa shear vector averaged from r 5 200 to (red line) and central pressure (blue line) is plotted above 800 km, (ii) RSST: Reynolds analysis sea surface tem- each panel, with the time corresponding to the radar perature (Reynolds and Smith 1993), (iii) D200: 200-hPa image denoted by a vertical green line.
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