Portal:Tropical cyclones

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Hurricane Pali at peak intensity, over the Central Pacific on January 13

Hurricane Pali was the earliest-forming Pacific hurricane on record, being the first Pacific hurricane to occur in January since Hurricane Ekeka of 1992. The first tropical cyclone of the 2016 Pacific hurricane season, Pali originated as an area of low pressure within a persistent trough, near the equator on January 6, 2016. Deep convection gradually built up around the center of the disturbance as the system curved northward, before it organized into a tropical depression on the next day, making the system the earliest recorded tropical cyclone in the Pacific hurricane basin. The system quickly intensified into a tropical storm, resulting in it being named Pali. During the next few days, Pali slowly moved northward while slowly curving towards the west, strengthening somewhat before weakening due to the presence of wind shear. On January 10, Pali slowly turned eastward and proceeded to re-strengthen as wind shear diminished. On January 12, Pali strengthened into a Category 1 hurricane on the Saffir–Simpson scale (SSWHS) while curving towards the south. The next day, Pali reached its peak intensity as a Category 2 hurricane, with 1-minute maximum sustained winds of 100 mph (155 km/h) and a minimum central pressure of 978 mbar (hPa; 28.88 inHg). Afterward, Pali quickly began to weaken, as the storm encountered stronger wind shear, with the storm weakening into a Category 1 hurricane several hours later, before weakening into a tropical storm later that day. On January 14, Pali weakened into a tropical depression before degenerating into a remnant low the next day, since conditions became increasingly hostile. Later that day, Pali's remnants dissipated near the same location where they had formed roughly a week ago. Pali formed and tracked near the equator, forming at a latitude of 3.3°N and tracking as low as 2.6°N as a tropical depression. This made Pali the second-lowest latitude tropical cyclone on record in the Western Hemisphere at the time, which was extremely unusual, given the unfavorable conditions that are usually in place around the equator. Pali had severe impacts in Kiribati, grounding a cargo ship and killing four people, in addition to causing major coastal flooding, although the total amount of damage was not specified in the island nation's report to the World Meteorological Organisation (WMO). (Full article...)

List of selected named cyclones

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Satellite imagery of Cyclone Ianos, a powerful Mediterranean tropical-like cyclone that impacted Greece on 17 September 2020.

Mediterranean tropical-like cyclones, often referred to as Mediterranean cyclones or Mediterranean hurricanes, and shortened as medicanes, are meteorological phenomena occasionally observed over the Mediterranean Sea. On a few rare occasions, some storms have been observed reaching the strength of a Category 1 hurricane, on the Saffir–Simpson scale, and Cyclone Ianos in 2020 was recorded reaching Category 2 intensity. The main societal hazard posed by medicanes is not usually from destructive winds, but through life-threatening torrential rains and flash floods. The occurrence of medicanes has been described as not particularly rare. Tropical-like systems were first identified in the Mediterranean basin in the 1980s, when widespread satellite coverage showing tropical-looking low pressures which formed a cyclonic eye in the center were identified. Due to the dry nature of the Mediterranean region, the formation of tropical, subtropical cyclones and tropical-like cyclones is infrequent and also hard to detect, in particular with the reanalysis of past data. Depending on the search algorithms used, different long-term surveys of satellite era and pre-satellite era data came up with 67 tropical-like cyclones of tropical storm intensity or higher between 1947 and 2014, and around 100 recorded tropical-like storms between 1947 and 2011. More consensus exists about the long term temporal and spatial distribution of tropical-like cyclones: they form predominantly over the western and central Mediterranean Sea while the area east of Crete is almost devoid of tropical-like cyclones. The development of tropical-like cyclones can occur year-round, with activity historically peaking between the months of September and January, while the counts for the summer months of June and July are the lowest, being within the peak dry season of the Mediterranean with stable air. (Full article...)

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Typhoon Man-yi (04W) off the coast of Taiwan, near peak intensity, as seen from the MODIS instrument on NASA's Aqua satellite on July 12, 2007. Man-Yi later weakened and struck Japan, causing three casualties.
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File:2020 Atlantic hurricane season summary.png

The 2020 Atlantic hurricane season was the most active Atlantic hurricane season on record, in terms of number of systems. It featured a total of 31 tropical or subtropical cyclones, with all but one cyclone becoming a named storm. Of the 30 named storms, 14 developed into hurricanes, and a record-tying seven further intensified into major hurricanes. It was the second and final season to use the Greek letter storm naming system, the first being 2005, the previous record. Of the 30 named storms, 11 of them made landfall in the contiguous United States, breaking the record of nine set in 1916. During the season, 27 tropical storms established a new record for earliest formation date by storm number. This season also featured a record ten tropical cyclones that underwent rapid intensification, tying it with 1995, as well as tying the record for most Category 4 hurricanes in a singular season in the Atlantic Basin. This unprecedented activity was fueled by a La Niña that developed in the summer months of 2020, continuing a stretch of above-average seasonal activity that began in 2016. Despite the record-high activity, this was the first season since 2015 in which no Category 5 hurricanes formed. The season officially started on June 1 and officially ended on November 30. However, tropical cyclogenesis is possible at any time of the year, as demonstrated by the early formation of Tropical Storms Arthur and Bertha, on May 16 and 27, respectively. This was the sixth consecutive year with a pre-season system and the second of these seasons to have two, with the other being 2016. The first hurricane, Hurricane Hanna, made landfall in Texas on July 25. Hurricane Isaias formed on July 31, and made landfall in The Bahamas and North Carolina in early August, both times as a Category 1 hurricane; Isaias caused $4.8 billion in damage overall. In late August, Laura made landfall in Louisiana as a Category 4 hurricane, becoming the strongest tropical cyclone on record in terms of wind speed to make landfall in the state, alongside the 1856 Last Island hurricane and Ida. Laura caused at least $19 billion in damage and 77 deaths. September was the most active month on record in the Atlantic, with ten named storms. Slow-moving Hurricane Sally impacted the United States Gulf Coast, causing severe flooding. The Greek alphabet was used for only the second and final time, starting on September 17 with Subtropical Storm Alpha, which made landfall in Portugal on the following day. Hurricane Zeta struck Louisiana on October 28, becoming the fourth named storm of the season to make landfall in the state, tying the record set in 2002. Zeta also struck the United States later in the calendar year than any major hurricane on record. On the last day of October, Hurricane Eta formed and made landfall in Nicaragua at Category 4 strength on November 3. Eta ultimately led to the deaths of at least 175 people and caused $8.3 billion in damage. Then, on November 10, Tropical Storm Theta became the record-breaking 29th named storm of the season and, three days later, Hurricane Iota formed in the Caribbean. Iota rapidly intensified into a high-end Category 4 hurricane, which also made 2020 the only recorded season with two major hurricanes in November. Iota ultimately made landfall in the same general area of Nicaragua that Eta had just weeks earlier and caused catastrophic damage. Overall, the tropical cyclones of the 2020 Atlantic hurricane season collectively caused at least 432 deaths and over $55.4 billion in damage, totaling to the seventh costliest season on record. All forecasting agencies predicted above-average activity, some well-above-average, citing factors such as the expectation of low wind shear, abnormally warm sea surface temperatures, and a neutral El Niño–Southern Oscillation or La Niña. Climate change likely played a role in the record-breaking season, with respect to intensity and rainfall. However, each prediction, even those issued during the season, underestimated the actual amount of activity. Early in 2020, officials in the United States expressed concerns the hurricane season could exacerbate the effects of the COVID-19 pandemic for coastal residents due to the potential for a breakdown of safety protocols such as social distancing and stay-at-home orders. (Full article...)

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File:2006 Atlantic hurricane season summary map.png

The 2006 Atlantic hurricane season was a cycle of the annual tropical cyclone season in the Atlantic Ocean in the Northern Hemisphere. The season officially began on June 1, 2006, and ended on November 30, 2006. These dates, adopted by convention, historically describe the period in each year when most subtropical or tropical cyclogenesis occurs in the Atlantic Ocean. The first storm to form in 2006 was Tropical Storm Alberto on June 10; the last, Hurricane Isaac, dissipated on October 2. The season saw near average activity in terms of the overall number of cyclones. There were ten named storms in the Atlantic basin in 2006, of which five became hurricanes with two intensifying further into major hurricanes. It was the first season since the 2001 season in which no hurricanes made landfall in the United States, and the first since the 1994 season that no tropical cyclones formed during October; activity was slowed by a rapidly forming El Niño event in 2006, the presence of the Saharan Air Layer over the tropical Atlantic, and the steady presence of a robust secondary high-pressure area to the Azores High centered on Bermuda. This timeline documents tropical cyclone formations, strengthening, weakening, landfalls, extratropical transitions, and dissipations during the season. It includes information that was not released throughout the season, meaning that data from post-storm reviews by the National Hurricane Center, such as a storm that was not initially warned upon, has been included. By convention, meteorologists use one time zone when issuing forecasts and making observations: Coordinated Universal Time (UTC), and also use the 24-hour clock (where 00:00 = midnight UTC). The National Hurricane Center uses both UTC and the time zone where the center of the tropical cyclone is currently located. The time zones utilized (east to west) are: Greenwich, Cape Verde, Atlantic, Eastern, and Central. In this timeline, all information is listed by UTC first, with the respective regional time zone included in parentheses. Additionally, figures for maximum sustained winds and position estimates are rounded to the nearest 5 units (knots, miles, or kilometers), following National Hurricane Center practice. Direct wind observations are rounded to the nearest whole number. Atmospheric pressures are listed to the nearest millibar and nearest hundredth of an inch of mercury. (Full article...)

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