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Meteorological process around and within the eye of intense tropical cyclones
In meteorology, an eyewall replacement cycle, also called a concentric eyewall cycle, is a process whereby some of the outer rainbands of a tropical cyclone
Eyewall_replacement_cycle
Center of a tropical cyclone
12 mi) across – often trigger eyewall replacement cycles, where a new eyewall begins to form outside the original eyewall. This can take place anywhere
Eye_(cyclone)
Category 5 Pacific hurricane in 2026
eyewall replacement cycle caused Polo to again weaken to Category 4 intensity a few hours later. Once again, Polo completed the eyewall replacement cycle
Hurricane_Polo
Category 4 Atlantic hurricane in 2021
northwest early on September 27, as it began to weaken due to an eyewall replacement cycle. The hurricane weakened to Category 3 intensity later that day
Hurricane_Sam
Category 5 Pacific hurricane in 2026
basin since Hurricane Walaka in 2018. Increasing wind shear and eyewall replacement cycles caused it to weaken to Category 3 status by September 4, but the
Hurricane_Lowell
undergoing a second eyewall replacement cycle, temporarily halting further development of the storm. After completing its eyewall replacement cycle, it strengthened
2026_Pacific_typhoon_season
stages of an eyewall replacement cycle. Over the next several hours Genevieve's eye became colder and more cloud—filled and an outer eyewall began to form
2026_Pacific_hurricane_season
Pacific typhoon in 2025
early on September 22. Shortly thereafter, Ragasa entered an eyewall replacement cycle while retaining its intensity. Ragasa later made landfall over
Typhoon_Ragasa
Pacific typhoon in 2026
(185 mph). Shortly after, an outer eyewall was detected on microwave imagery, suggesting the onset of an eyewall replacement cycle—a process common in very powerful
Typhoon_Sinlaku_(2026)
Pacific typhoon in 2019
Mariana Islands, Hagibis began an eyewall replacement cycle, which halted further strengthening. As the primary eyewall began to erode, the JTWC downgraded
Typhoon_Hagibis
Pacific typhoon in 2026
as a Category 5-equivalent typhoon according to the JTWC. An eyewall replacement cycle ensued causing some slight weakening overnight on July 4, but
Typhoon_Bavi_(2026)
Category 5 Atlantic hurricane in 2024
Rita in 2005. Milton weakened to a Category 4 hurricane after an eyewall replacement cycle and reintensified into a Category 5 hurricane the following day
Hurricane_Milton
Category 5 Atlantic hurricane in 2017
Categories 2 and 3 for the next several days, due to a series of eyewall replacement cycles. On September 4, Irma resumed intensifying, becoming a Category 5
Hurricane_Irma
Category 5 Pacific hurricane in 2009
hours, Rick began to weaken in response to a combination of an eyewall replacement cycle and increasing wind shear. By October 19, the storm was downgraded
Hurricane_Rick_(2009)
Pacific typhoon in 2021
an eyewall replacement cycle caused Surigae to gradually weaken as its track shifted north-northwestward in the Philippine Sea. Following the eyewall replacement
Typhoon_Surigae_(2021)
on October 2 after its eyewall fully closed. The storm then rapidly intensified over the next day. An eyewall replacement cycle that took place during
2018_Pacific_hurricane_season
storm weakened to a Category 4 hurricane due to an eyewall replacement cycle; however, upon the cycle's completion, it quickly restrengthened back to Category 5
2024 Atlantic hurricane season
2024_Atlantic_hurricane_season
Category 4 Pacific hurricane
towards the northwest as it underwent rapid intensification and an eyewall replacement cycle, before peaking as a Category 4 hurricane on October 4, with maximum
Hurricane_Sergio_(2018)
underwent an eyewall replacement cycle and encountered some dry mid-level air. Although the eye reappeared on satellite as the eyewall cycle completed,
2015_Pacific_hurricane_season
Category 5 Pacific hurricane in 2018
and a pressure of 921 mbar (27.20 inHg), early on October 2. An eyewall replacement cycle caused the hurricane to weaken, though it remained a major hurricane
Hurricane_Walaka
Category 4 Pacific hurricane in 2001
hurricane on the Saffir-Simpson scale, only to weaken due to an eyewall replacement cycle, then re-intensified a day later to attain maximum sustained winds
Hurricane_Juliette_(2001)
early on August 29. However, the system then weakened due to an eyewall replacement cycle and wind shear from the outflow of Idalia. Later that day, Franklin
2023 Atlantic hurricane season
2023_Atlantic_hurricane_season
Pacific typhoon in 2023
the Saffir–Simpson hurricane wind scale. It then underwent an eyewall replacement cycle, then reintensified to attain 1-minute sustained winds of 305 km/h
Typhoon_Mawar
Category 5 Pacific hurricane
periods of intensification on record in the basin. Thereafter, an eyewall replacement cycle commenced. and decreasing sea surface temperatures caused the
Hurricane_Jova_(2023)
fueled two periods of rapid intensification. Punctuated by an eyewall replacement cycle on August 27 that dramatically expanded the hurricane's size,
Meteorological history of Hurricane Katrina
Meteorological_history_of_Hurricane_Katrina
North Indian Ocean cyclone in 2013
the system underwent an eyewall replacement cycle and formed a new eyewall which subsequently consolidated. After the new eyewall had consolidated the system
Cyclone_Phailin
day as it approached Guam. Land interaction with Guam and an eyewall replacement cycle caused the storm to weaken slightly but eventually restrengthened
2023_Pacific_typhoon_season
Pacific typhoon in 2019
of February. Wutip underwent an eyewall replacement cycle shortly afterward and weakened. The storm finished its cycle on February 24, rapidly intensifying
Typhoon_Wutip_(2019)
northwestward and began a lengthy eyewall replacement cycle, taking 36 hours to complete, and causing the core to present a double eyewall for an extended period
2025 Atlantic hurricane season
2025_Atlantic_hurricane_season
Category 5 Atlantic hurricane in 1967
Tropical Storm Doria. The powerful storm weakened somewhat as an eyewall replacement cycle began to take shape. During this phase, the inner-eye of Beulah
Hurricane_Beulah
Category 4 Pacific hurricane
and it attained peak winds of 130 mph (210 km/h) on August 30. Eyewall replacement cycles and land interaction with western Mexico weakened the hurricane
Hurricane_John_(2006)
Project intending to improve hurricane forecasting
mechanism by which hurricane eyewall replacement cycle occurs. Luckily for the sake of the research, one such case of eyewall replacement occurred during the study
The Hurricane Rainband and Intensity Change Experiment
The_Hurricane_Rainband_and_Intensity_Change_Experiment
Category 5 Atlantic hurricane
hurricane the following day before weakening due to an eyewall replacement cycle. After completing the cycle, Lorenzo rapidly restrengthened, peaking at Category 5
Hurricane_Lorenzo_(2019)
Category 5 Atlantic hurricane in 2022
14:00 UTC. Ian strengthened slightly once offshore, then initiated an eyewall replacement cycle causing its wind speed to remain steady at 120 mph (195 km/h)
Hurricane_Ian
Category 4 Pacific hurricane in 2008
subtropical ridge over Mexico, it began an eyewall replacement cycle which led to steady weakening. Completing this cycle and briefly reintensifying into a major
Hurricane_Norbert_(2008)
Category 5 Atlantic hurricane in 2017
a pressure of 908 mbar (hPa; 26.81 inHg). On September 20, an eyewall replacement cycle weakened Maria to a high-end Category 4 hurricane by the time
Hurricane_Maria
reaching peak intensity, Wilma's inner eye dissipated due to an eyewall replacement cycle. Hurricane Wilma weakened to a Category 4 hurricane, and on October
Meteorological history of Hurricane Wilma
Meteorological_history_of_Hurricane_Wilma
Category 5 Atlantic hurricane
for several days on account of strong wind shear and multiple eyewall replacement cycles. On September 13, the system rounded the southwest side of a large
Hurricane_Lee_(2023)
Category 5 Pacific hurricane in 2015
analysis of such. Later on October 23, rapid weakening ensued as an eyewall replacement cycle took shape and wind shear increased. In the five hours up until
Hurricane_Patricia
imagery depicted the formation of a secondary outer eyewall, indicative of an eyewall replacement cycle. By 20:30 UTC, the final pass by reconnaissance,
Meteorological history of Hurricane Patricia
Meteorological_history_of_Hurricane_Patricia
Over the subsequent days its intensity fluctuated largely due to eyewall replacement cycles, and Ivan passed just south of Jamaica, the Cayman Islands, and
Meteorological history of Hurricane Ivan
Meteorological_history_of_Hurricane_Ivan
Category 5 Pacific hurricane in 2014
area 575 mi (925 km) across. Marie subsequently underwent an eyewall replacement cycle on August 25 which prompted steady weakening. Over the next several
Hurricane_Marie_(2014)
Category 4 Atlantic hurricane in 2018
minimum central pressure of 937 mbar (27.7 inHg). An unexpected eyewall replacement cycle and decreasing oceanic heat content caused a steady weakening
Hurricane_Florence
formed concentric eyewalls, but it was not until the hurricane moved over cooler waters that the storm's eyewall replacement cycle was completed. When
2002_Pacific_hurricane_season
Pacific typhoon in 2026
scale on July 28, before its intensification was stunted by an eyewall replacement cycle.[citation needed] After finishing, Dolphin resumed intensifying
Typhoon_Dolphin_(2026)
Category 5 Atlantic hurricane in 2005
wind scale, becoming the third major hurricane of the season. An eyewall replacement cycle disrupted the intensification but caused the storm to nearly double
Hurricane_Katrina
Pacific typhoon in 2018
Category 5 super typhoon early on October 2. Kong-rey underwent an eyewall replacement cycle after its peak intensity, causing it to weaken into a Category
Typhoon_Kong-rey_(2018)
Cabo San Lucas, Baja California Sur. Then, after undergoing an eyewall replacement cycle, and weakening to a Category 3, it re-intensified to Category 4
2023_Pacific_hurricane_season
Pacific typhoon in 2024
eyewall replacement cycle became apparent in radar imagery, with the secondary eyewall almost completely encircling the inner eye. Once the eyewall replacement
Typhoon_Krathon
Island in Calayan, Cagayan on September 22 before undergoing an eyewall replacement cycle afterwards. The storm then affected Southern China and Vietnam
2025_Pacific_typhoon_season
Category 5 Atlantic hurricane in 2025
160 mph (260 km/h) and a minimum pressure of 913 mb (27.0 inHg). An eyewall replacement cycle occurred later that day, and as a result, Erin fluctuated in intensity
Hurricane_Erin_(2025)
Category 5 Pacific hurricane and typhoon in 2006
for about 18 hours, Ioke weakened slightly due to an eyewall replacement cycle. Completing the cycle on August 26, the hurricane restrengthened to Category 5
Hurricane_Ioke
eye clouded over and convective structure expanded due to an eyewall replacement cycle. Afterward, Kristy reintensified, becoming a Category 5 hurricane
2024_Pacific_hurricane_season
Category 4 Atlantic hurricane
initiating an eyewall replacement cycle, causing it to begin to slowly weaken as it turned northeastward. That trend continued after the cycle was completed
Hurricane_Franklin_(2023)
North Indian Ocean cyclone in 2020
microwave imagery depicted two distinct concentric eyewalls, a telltale sign of an eyewall replacement cycle that is typical for very intense cyclones. Through
Cyclone_Amphan
Cyclone season in Australia
began an eyewall replacement cycle as shown by radar imagery, causing the rapid intensification phase to end. Increasing wind shear and the eyewall replacement
2024–25 Australian region cyclone season
2024–25_Australian_region_cyclone_season
Category 4 Atlantic hurricane in 2020
and became a Category 4 hurricane. Internal fluctuations and eyewall replacement cycles then caused the storm to fluctuate in intensity before it weakened
Hurricane_Teddy
same day, Erick developed a concentric eyewall structure, indicative of an eyewall replacement cycle. After the cycle was complete, the system intensified
2025_Pacific_hurricane_season
Tropical cyclone in the Indian Ocean in 2022
forming a small eye around its CDO. Emnati then underwent a lengthy eyewall replacement cycle, which strongly weakened the storm as it moved closer to Madagascar
Cyclone_Emnati
Category 5 Atlantic hurricane in 2024
12:00 UTC on June 30 and a Category 4 hurricane six hours later. An eyewall replacement cycle then weakened Beryl to a Category 3 hurricane early on July 1
Hurricane_Beryl
Pacific typhoon in 2024
260 km/h (160 mph). The following day, Kong-rey completed an eyewall replacement cycle and approached Taiwan from the southeast, and passed close to
Typhoon_Kong-rey_(2024)
Pacific typhoon in 2019
peaked as a Category 4–equivalent Super typhoon. However, an eyewall replacement cycle caused the typhoon to weaken before it made landfall in Zhejiang
Typhoon_Lekima
5 intensity. Afterward, the cyclone stalled and underwent an eyewall replacement cycle (EWRC), which ended its rapid intensification phase. Radar imagery
Tropical_cyclones_in_2025
Category 4 Atlantic hurricane in 2023
western quadrant". Idalia's intensification was then halted by an eyewall replacement cycle, which caused it to weaken prior to landfall. Idalia made landfall
Hurricane_Idalia
Category 5 Pacific hurricane in 2018
(260 km/h) on the following day. Afterward, a combination of an eyewall replacement cycle and increasing wind shear weakened the hurricane, and early on
Hurricane_Willa
North Indian Ocean cyclone in 2023
extremely severe cyclonic storm intensity. After undergoing an eyewall replacement cycle, Mocha rapidly strengthened, peaking at Category 5-equivalent
Cyclone_Mocha
and barometric pressure of 925 hPa (27.32 inHg). Thereafter, an eyewall replacement cycle and cooler waters weakened the system. Though it passed over the
2013_Pacific_typhoon_season
Pacific typhoon in 2018
peak intensity on July 6; subsequently, Maria weakened due to an eyewall replacement cycle, but it reintensified and reached a second, stronger peak intensity
Typhoon_Maria_(2018)
day as it approached Guam. Land interaction with Guam and an eyewall replacement cycle caused the storm to weaken slightly but eventually restrengthened
Tropical_cyclones_in_2023
Pacific typhoon in 2021
the highest category on the Saffir–Simpson scale. Subsequent eyewall replacement cycles caused intensity fluctuations, but on September 10, Chanthu peaked
Typhoon_Chanthu_(2021)
against some shear and an intrusion of dry mid-level air during an eyewall replacement cycle, Larry became a Category 3 major hurricane by 00:00 UTC on September
2021 Atlantic hurricane season
2021_Atlantic_hurricane_season
Cyclone season in the Southwest Indian Ocean
day, microwave imagery revealed a second eyewall formation, indicating the onset of an eyewall replacement cycle. A sharp increase of wind shear caused
2018–19 South-West Indian Ocean cyclone season
2018–19_South-West_Indian_Ocean_cyclone_season
Pacific typhoon in 2022
super typhoon. Hinnamnor then weakened due to undergoing an eyewall replacement cycle. However, it re-intensified to a Category 5 super typhoon, the
Typhoon_Hinnamnor
Pacific typhoon in 2014
Vongfong began to gradually weaken on October 9, because of an eyewall replacement cycle. On October 10, the structure of the typhoon decayed more, and
Typhoon_Vongfong_(2014)
Category 4 Pacific hurricane in 2015
Saffir–Simpson scale with winds of 130 mph (215 km/h) on July 15. An eyewall replacement cycle began and cooler sea-surface temperatures rapidly weakened the
Hurricane_Dolores_(2015)
Pacific typhoon in 2023
almost complete surrounded by dry air, Doksuri began to undergo an eyewall replacement cycle at 15:00 UTC. PAGASA downgraded the storm into a typhoon prior
Typhoon_Doksuri
Category 5 Atlantic hurricane in 2005
(295 km/h), making Wilma a Category 5 on the Saffir–Simpson scale. An eyewall replacement cycle caused Wilma to weaken below Category 5 status on October 20.
Hurricane_Wilma
Category 5 Atlantic hurricane in 2007
On August 18, Hurricane Dean developed a double eyewall, indicating that an eyewall replacement cycle was taking place and causing short term fluctuations
Hurricane_Dean
assigned the local name Jose. On August 4, Halong underwent an eyewall replacement cycle and consequently, it weakened to a Category 4 typhoon as it curved
2014_Pacific_typhoon_season
Pacific typhoon in 2020
Category 3-equivalent typhoon and developing a pinhole eye before entering an eyewall replacement cycle (EWRC). Strengthening resumed shortly afterward, and the JTWC
Typhoon_Haishen_(2020)
Pacific typhoon in 2024
sustained winds of 260 km/h (160 mph). After weakening due to an eyewall replacement cycle, Yagi rapidly reintensified to a second Category 5 peak with one-minute
Typhoon_Yagi
Category 5 Atlantic hurricane in 2019
westward weakened. Later that day, the storm began to undergo an eyewall replacement cycle to the north of Grand Bahama; the Bermuda High to the northeast
Hurricane_Dorian
Category 5 Atlantic hurricane in 1992
center. After reaching that intensity, the hurricane underwent an eyewall replacement cycle. At 21:00 UTC on August 23, Andrew made landfall on Eleuthera
Hurricane_Andrew
Category 4 Atlantic hurricane in 2008
Inagua, the development of a double eyewall—a feature that usually denotes the beginning of an eyewall replacement cycle—slightly weakened Ike late on September 7
Hurricane_Ike
Islands, Hagibis began an eyewall replacement cycle, which caused the rapid intensification phase to end. As the primary eyewall began to erode, the typhoon
2019_Pacific_typhoon_season
Category 4 hurricane six hours later. The hurricane underwent an eyewall replacement cycle the next day, but ultimately attained peak winds of 145 mph (235 km/h)
2014 Atlantic hurricane season
2014_Atlantic_hurricane_season
Category 4 Atlantic hurricane in 2014
Ophelia in 2011. Subsequently, a concentric eyewall structure indicated an imminent eyewall replacement cycle, with the inner feature "about as small as
Hurricane_Gonzalo
Pacific typhoon in 2014
3 due to its eye replacing the old one and undergoing a minor eyewall replacement cycle. Phanfone later entered the PAR, assigning the name Neneng. It
Typhoon_Phanfone_(2014)
North Indian Ocean cyclone in 2021
an eyewall replacement cycle, which started to weaken the storm. As the storm neared the coast of Gujarat, Tauktae completed its eyewall replacement cycle
Cyclone_Tauktae
Topics referred to by the same term
Challenge, a robotics competition Extrachromosomal rDNA circle Eyewall replacement cycle, phenomenon seen in intense tropical cyclones Panhard ERC, a French
ERC
Pacific typhoon in 2013
barometric pressure of 925 mbar (hPa; 27.32 inHg). Thereafter, an eyewall replacement cycle and cooler waters weakened the system. Though it passed over the
Typhoon_Soulik_(2013)
Category 5 Atlantic hurricane in 2025
for a storm of such high intensity, Melissa never underwent an eyewall replacement cycle, allowing it to sustain its high intensity for a prolonged period
Hurricane_Melissa
South-West Indian cyclone in 2019
934 hPa (27.58 inHg). At that time, Kenneth began to undergo an eyewall replacement cycle and weakened slightly, before making landfall later that day as
Cyclone_Kenneth
Pacific typhoon in 2016
before it deepened further with a sharply-outlined eye. Later, an eyewall replacement cycle occurred, as microwave satellite imagery revealed a solid inner
Typhoon_Haima
1971 natural disaster in Australia
monitored closely by land-based radar that depicted an ongoing eyewall replacement cycle. Althea produced copious rainfall over central and western Queensland
Cyclone_Althea
Pacific typhoon in 2007
storm maintained its strength for 2 days, until it underwent an eyewall replacement cycle, just before he storm makes landfall in Taiwan on August 17 (+21:00
Typhoon_Sepat
Category 4 Atlantic hurricane in 1999
Abaco islands. During this time, Floyd underwent an eyewall replacement cycle, in which an outer eyewall developed, causing the original eye to dissipate
Hurricane_Floyd
on July 18, Daniel attained hurricane status. It underwent an eyewall replacement cycle, temporarily halting its intensification trend. Daniel restrengthened
2006_Pacific_hurricane_season
Category 4 Pacific hurricane in 2014
deepening was forecast, strengthening leveled off thereafter as an eyewall replacement cycle, common in intense hurricanes, began to run its course. Despite
Hurricane_Odile
Pacific typhoon in 2024
development of a secondary eyewall, suggesting that the system was undergoing an eyewall replacement cycle, although the cycle could not be completed. The
Typhoon_Man-yi
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EYEWALL REPLACEMENT-CYCLE
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EYEWALL REPLACEMENT-CYCLE
EYEWALL REPLACEMENT-CYCLE
EYEWALL REPLACEMENT-CYCLE
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