Precipitation Processes and Vortex Alignment during the Intensification of a Weak Tropical Cyclone in Moderate Vertical Shear

Rogers, Robert F.; Reasor, Paul D.; Zawislak, Jonathan A.; Nguyen, Leon T.

doi:10.1175/MWR-D-19-0315.1

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Precipitation Processes and Vortex Alignment during the Intensification of a Weak Tropical Cyclone in Moderate Vertical Shear

2020
By Rogers, Robert F. ; Reasor, Paul D. ; Zawislak, Jonathan A. ; ...
Source: Monthly Weather Review, 148 (5)

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Journal Title:

Monthly Weather Review
Personal Author:

Rogers, Robert F. ; Reasor, Paul D. ; Zawislak, Jonathan A. ; Nguyen, Leon T.

Rogers, Robert F. ; Reasor, Paul D. ; Zawislak, Jonathan A. ; Nguyen, Leon T. Less -
NOAA Program & Office:

CIMAS (Cooperative Institute for Marine and Atmospheric Studies) ; OAR (Oceanic and Atmospheric Research) ; AOML (Atlantic Oceanographic and Meteorological Laboratory)

CIMAS (Cooperative Institute for Marine and Atmospheric Studies) ; OAR (Oceanic and Atmospheric Research) ; AOML (Atlantic Oceanographic and Meteorological Laboratory) Less -
Description:

The mechanisms underlying the development of a deep, aligned vortex, and the role of convection and vertical shear in this process, are explored by examining airborne Doppler radar and deep-layer dropsonde observations of the intensification of Hurricane Hermine (2016), a long-lived tropical depression that intensified to hurricane strength in the presence of moderate vertical wind shear. During Hermine’s intensification the low-level circulation appeared to shift toward locations of deep convection that occurred primarily downshear. Hermine began to steadily intensify once a compact low-level vortex developed within a region of deep convection in close proximity to a midlevel circulation, causing vorticity to amplify in the lower troposphere primarily through stretching and tilting from the deep convection. A notable transition of the vertical mass flux profile downshear of the low-level vortex to a bottom-heavy profile also occurred at this time. The transition in the mass flux profile was associated with more widespread moderate convection and a change in the structure of the deep convection to a bottom-heavy mass flux profile, resulting in greater stretching of vorticity in the lower troposphere of the downshear environment. These structural changes in the convection were related to a moistening in the midtroposphere downshear, a stabilization in the lower troposphere, and the development of a mid- to upper-level warm anomaly associated with the developing midlevel circulation. The evolution of precipitation structure shown here suggests a multiscale cooperative interaction across the convective and mesoscale that facilitates an aligned vortex that persists beyond convective time scales, allowing Hermine to steadily intensify to hurricane strength.
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Cyclones—Tropics
Source:

Monthly Weather Review, 148 (5)
DOI:

https://doi.org/10.1175/MWR-D-19-0315.1
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Journal Article
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urn:sha256:c5de2978ab6affbb8e3bd85c5e52d0c48009b8a87c59b40aa05b538e9c07e09c
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Precipitation Processes and Vortex Alignment during the Intensification of a Weak Tropical Cyclone in Moderate Vertical Shear

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