A Global Climatology of Tropical Cyclone Eyes

Knapp, Kenneth R.; Velden, Christopher S.; Wimmers, Anthony J.

doi:10.1175/mwr-d-17-0343.1

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i

A Global Climatology of Tropical Cyclone Eyes

2018
By Knapp, Kenneth R. ; Velden, Christopher S. ; Wimmers, Anthony J.
Source: Monthly Weather Review, 146(7), 2089-2101

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Journal Title:

Monthly Weather Review
Personal Author:

Knapp, Kenneth R. ; Velden, Christopher S. ; Wimmers, Anthony J.

Knapp, Kenneth R. ; Velden, Christopher S. ; Wimmers, Anthony J. Less -
NOAA Program & Office:

NESDIS (National Environmental Satellite, Data, and Information Service) ; CIMSS (Cooperative Institute for Meteorological Satellite Studies) ; NCEI (National Centers for Environmental Information)

NESDIS (National Environmental Satellite, Data, and Information Service) ; CIMSS (Cooperative Institute for Meteorological Satellite Studies) ; NCEI (National Centers for Environmental Information) Less -
Description:

Intense tropical cyclones (TCs) generally produce a cloud-free center with calm winds, called the eye. The Automated Rotational Center Hurricane Eye Retrieval (ARCHER) algorithm is used to analyze Hurricane Satellite (HURSAT) B1 infrared satellite imagery data for storms occurring globally from 1982 to 2015. HURSAT B1 data provide 3-hourly observations of TCs. The result is a 34-yr climatology of eye location and size. During that time period, eyes are identified in about 13% of all infrared images and slightly more than half of all storms produced an eye. Those that produce an eye have (on average) 30 h of eye scenes. Hurricane Ioke (1992) had the most eye images (98, which is 12 complete days with an eye). The median wind speed of a system with an eye is 97 kt (50 m s−1) [cf. 35 kt (18 m s−1) for those without an eye]. Eyes are much more frequent in the Northern Hemisphere (particularly in the western Pacific) but eyes are larger in the Southern Hemisphere. The regions where eyes occur are expanding poleward, thus expanding the area at risk of TC-related damage. Also, eye scene occurrence can provide an objective measure of TC activity in place of those based on maximum wind speeds, which can be affected by available observations and forecast agency practices.
Keywords:

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Atmospheric Science
Source:

Monthly Weather Review, 146(7), 2089-2101
DOI:

https://doi.org/10.1175/mwr-d-17-0343.1
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0027-0644;1520-0493;
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PDF
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American Meteorological Society
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Journal Article
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urn:sha256:29975d03f639dd06ef1cf13107f6d0b6e1fc1ae10bc596709c13ef24a2ff59a8
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https://repository.library.noaa.gov/view/noaa/59938/noaa_59938_DS1.pdf
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A Global Climatology of Tropical Cyclone Eyes

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