Hurricane Sam

Hurricane Sam
Hurricane Sam near peak intensity on September 26
Meteorological history
FormedSeptember 22, 2021
ExtratropicalOctober 5, 2021
DissipatedOctober 7, 2021
Category 4 major hurricane
1-minute sustained (SSHWS/NWS)
Highest winds155 mph (250 km/h)
Lowest pressure927 mbar (hPa); 27.37 inHg
Overall effects
FatalitiesNone
DamageMinimal
Areas affectedWest Africa, Lesser Antilles, Puerto Rico, Bermuda, Iceland, Greenland
IBTrACS

Part of the 2021 Atlantic hurricane season

Hurricane Sam was a powerful and long-lived Cape Verde hurricane that threatened Bermuda, lasting from September 22 through October 7, 2021. It was the fifth longest-lasting intense Atlantic hurricane, as measured by accumulated cyclone energy, since reliable records began in 1966.[1] Sam was the eighteenth named storm, seventh hurricane, and fourth major hurricane[nb 1] of the 2021 Atlantic hurricane season.

Sam originated from a tropical wave that departed from the western coast of Africa on September 19. The system developed into a tropical depression on September 22, as upper-level winds gradually became more favorable. Intensification was initially slow, with the depression strengthening into Tropical Storm Sam a day later. Soon afterward, the structure of the cyclone quickly improved and rapid intensification began. Sam strengthened into a hurricane on September 24, and reached Category 4 status late on September 25. Sam peaked on September 26 as a high-end Category 4 hurricane, with maximum sustained winds of 155 mph (249 km/h) and a minimum central pressure of 927 mbar (27.4 inHg). The storm turned towards the 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, as its structure decayed. Sam regained Category 4 status early on September 28. Another eyewall replacement cycle on September 29 disrupted the storm once more.

A tropical storm watch was issued for Bermuda on September 30, due to the potential for tropical storm conditions. The watch was upgraded to a tropical storm warning later that day. Sam began to strengthen again on September 30, as the eyewall replacement cycle concluded. Sam reached a secondary peak on October 1, with winds of 150 mph (240 km/h) and a pressure of 934 mbar (27.6 inHg). Around that time, the storm began a northward track. The hurricane began to weaken on October 2, as a result of increasing vertical wind shear and cooler sea surface temperatures. Sam finally dropped below major hurricane status on October 3, after nearly eight days. It had remained a major hurricane longer than any Atlantic system since Hurricane Ivan in 2004.[1] The storm moved east-northeastward to northeastward, and then northward, with increasing forward speed while gradually losing strength, weakening to Category 1 status the following day. Sam completed its transition into an extratropical cyclone on October 5, after which its remnants meandered over the northern Atlantic, near Iceland and Greenland, before being absorbed by another extratropical system on October 7.

Meteorological history

Map plotting the track and the intensity of the storm, according to the Saffir–Simpson scale
Map plotting the storm's track and intensity, according to the Saffir–Simpson scale
Map key
  Tropical depression (≤38 mph, ≤62 km/h)
  Tropical storm (39–73 mph, 63–118 km/h)
  Category 1 (74–95 mph, 119–153 km/h)
  Category 2 (96–110 mph, 154–177 km/h)
  Category 3 (111–129 mph, 178–208 km/h)
  Category 4 (130–156 mph, 209–251 km/h)
  Category 5 (≥157 mph, ≥252 km/h)
  Unknown
Storm type
triangle Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

Origins, development, and peak intensity

Hurricane Sam originated from a westward tracking tropical wave that departed from the western coast of Africa on September 19.[3] The National Hurricane Center (NHC) had first forecast the possibility of tropical development earlier that day.[4] Although thunderstorm activity was somewhat organized, the system lacked a closed surface circulation. Upper-level winds hindered the development of the system over the next day,[5][6] causing fluctuations in organization.[7][8] Thunderstorms became increasingly organized,[9] and an elongated low-level surface circulation developed on September 22. This led to the formation of a tropical depression around 21:00 UTC that day. At that time, a mid-level ridge located to the north and west was steering the system westward. The nascent depression was located in a favorable environment both below and aloft, with sea surface temperatures of 82–84 °F (28–29 °C) and low vertical wind shear.[10]

Intensification was initially slow; the cyclone's center was still attached to the northern edge of a low-pressure trough and the former's surface circulation was only narrowly closed.[11] Although the depression had curved rainbands across its northern and western sides, dry air was entraining across its eastern flank.[12] The depression was upgraded to Tropical Storm Sam at 15:00 UTC on September 23, after its structure improved significantly on both satellite and microwave imagery; the latter showed a banding feature wrapping around 75 percent of the center. The combination of a favorable environment, Sam's structural improvement, and the alignment of the cyclone's low- and mid-level centers signaled that rapid intensification was imminent.[13] The storm rapidly intensified shortly after, with an eyewall forming on microwave imagery,[14] as well as, banding features that wrapped around most of its center. Sam became a Category 1 hurricane around 09:00 UTC on September 24.[15]

Sam's strengthening then halted for a brief period as dry air degraded the western portion of its core.[16] The cyclone began to intensify again late on September 24 as the dry air's influence lessened, however, microwave imagery displayed concentric eyewalls, indicating that Sam was undergoing an eyewall replacement cycle. The storm continued to track west-northwest, however, its forward speed began to decrease as a result of the mid-level ridge moving to the northwest of Sam.[17] A small, 12-mi (19-km) wide eye emerged on infrared satellite imagery early on September 25, surrounded by a symmetric ring of cold, −94 °F (−70 °C) cloud tops.[18][19] Sam was upgraded to a Category 3 major hurricane at 15:00 UTC on September 25, after its eye became mostly cloud-free.[20] The cyclone further strengthened to Category 4 status by 21:00 UTC.[21] A NOAA Hurricane Hunters reconnaissance aircraft surveying the storm later that day indicated that multiple mesovortices, including some tornadic-scale ones, were present in both the southeastern and northwestern portions of the eyewall; the wind directions were entirely opposite to the normal wind direction in some regions. Radar from the aircraft displayed that dry air was entraining into the storm, thinning the eyewall in numerous locations.[22] The hurricane continued to intensify through September 26, with the NHC estimating that Sam's peak probably occurred between 19:00 and 22:00 UTC, likely attaining maximum sustained winds of 155 mph (250 km/h) and a minimum central pressure of 927 mbar (27.4 inHg). During that time, the eye had shrunk to a diameter of 8 miles (13 km),[23] and the cold convection surrounding the eye had grown in size. Likewise, a microwave pass showed a compact, strong eyewall surrounding the small eye. Sam became only the second Category 4 or 5 hurricane on record so far east or south in the Atlantic so late in the year; the first being Lorenzo in 2019.[24] Despite Sam's intensity, it remained a small storm, with tropical storm-force winds reaching out 80 miles (130 km) from its center.[25]

Eyewall replacement cycles, threat to Bermuda, and secondary peak

Hurricane Sam at its secondary peak on October 1

A subtropical ridge located to the north and northeast of Sam caused it to begin tracking northwestward early on September 27. At the same time, a second eyewall replacement cycle was causing the cyclone to weaken. The storm's eye had doubled in size and was cloud-filled while convection in the eyewall was irregular and had degraded across Sam's eastern side.[23] Soon after, Sam's eye disappeared entirely from infrared and visible satellite imagery as a result of the replacement cycle and mid-level dry air intrusions from the west.[26][27] The cyclone weakened to Category 3 status around 15:00 UTC,[27] and bottomed out at 120 mph (190 km/h) around 21:00 UTC. By that time, a new eye had emerged on satellite imagery, surrounded by a ring of −85 °F (−65 °C) cloud tops.[28] A reconnaissance aircraft found that the cyclone's wind field had increased following the eyewall replacement cycle,[29] with the radius of hurricane-force winds expanding to 40 miles (64 km) and the radius of tropical-storm-force winds increasing to 125 miles (201 km).[30][31]

Sam restrengthened into a Category 4 hurricane around 09:00 UTC on September 28, after a ring of colder clouds formed around its eye. The concentric eyewalls that were priorly apparent had fused together in a single eyewall.[29][32] Later that day, the storm's structure degraded, with its eye becoming less pronounced in satellite imagery. Upper-level outflow was reduced in Sam's southwestern region as a result of impinging mid-level dry air, and multiple arcus clouds were radiating outward from the western side of the storm.[33] Sam strengthened to 140 mph (230 km/h) early on September 29, while its eye warmed and convection in its eyewall cooled.[34] Shortly after, the cyclone experienced slight weakening as a result of moderate southwesterly wind shear, with Sam's eye becoming cloud-filled and the circulation slanting along the southwest-to-northeast. However, the convection surrounding the eye had cooled.[35] Later that day, Sam's overall cloud pattern had improved, however, a Hurricane Hunters reconnaissance aircraft reported that another eyewall replacement cycle was underway.[36][37]

The Bermuda Weather Service issued a tropical storm watch for Bermuda at 09:00 UTC on September 30 due to the potential for the cyclone to bring tropical storm conditions to the island.[38] The watch was increased to a tropical storm warning at 21:00 UTC.[39] Early on September 30, Sam began another strengthening trend as the eyewall replacement cycle concluded, located over a warm ocean eddy and within a region of low wind shear.[40] The cyclone exhibited a warm 50–68 °F (10–20 °C), 29-mi (46-km) wide eye surrounded by cold, −76 to −94 °F (−60 to −70 °C) cloud tops from September 30–October 1.[41][42] Early on October 1, Sam turned towards the north-northwest as it began to round the western edge of the subtropical ridge.[42] Sam reached its secondary peak around 09:00 UTC, with maximum sustained winds of 150 mph (240 km/h) and a minimum central pressure of 934 mbar (27.6 inHg).[43]

Weakening and demise

Sam as an extratropical cyclone on October 6

The cyclone maintained its intensity for about 12 hours as it tracked northward.[44][45] The storm maintained a symmetric, well-defined eye, and multiple mesovorticies were apparent in satellite images.[45] Sam began to weaken on October 2, with its eye becoming cloud-filled.[46] During the next several hours, the cyclone turned towards the northeast under the influence of a steering flow between a sizeable low-pressure system located over Atlantic Canada and a deep-layer ridge located to the east and northeast of Sam.[46][47] Moderate southerly deep-layer shear continued to weaken the system,[48] with Sam falling to Category 3 intensity by 21:00 UTC.[49] The hurricane's eye disappeared from satellite imagery and its cloud tops warmed to −76 to −85 °F (−60 to −65 °C) on October 3.[50][51] Sam bottomed out as a low-end Category 2 hurricane later that day.[52] The cyclone began another eyewall replacement late on October 3, as it crossed into sub-79 °F (26 °C) sea surface temperatures. Sam's wind field continued to grow, with tropical-storm-force winds extending up to 230 mi (370 km) out from the center on all four sides.[53]

Sam strengthened slightly as it moved across a warm eddy early on October 4. The storm's inner eyewall became more intense and its eye cleared.[54] The cyclone moved across colder sea surface temperatures shortly after and resumed weakening. The inner eyewall quickly decayed on the northwestern side.[55] Sam weakened to a Category 1 hurricane around 21:00 UTC as its cloud tops warmed and its eye vanished from satellite imagery.[56][57] Sam began to transition to extratropical cyclone shortly after, with its cloud pattern broadening on the northwestern side and convection decreasing.[58]

At 09:00 UTC on October 5, Sam became fully extratropical as it traversed 57 °F (14 °C) waters, and the NHC issued its final advisory on the storm. Sam's low-level circulation center was exposed on the southern edge of a −58 °F (−50 °C) cloud band. The cyclone had developed the appearance of an occluded extratropical system. Although its core remained warm in the middle and upper levels, the lower level consisted of cold stratocumulus clouds.[59] For the next few days, Sam executed a short counterclockwise loop, before continuing its northeastward motion, while gradually weakening.[60][61][62] Early on October 7, the post-tropical cyclone merged with another extratropical low over the north Atlantic. Afterward, this new low made a large counterclockwise loop between Iceland and Greenland, before being absorbed by a stronger low on October 9, to the southwest of Iceland.[62][63] This low then accelerated eastward while rapidly weakening, passing just south of Iceland, before being absorbed by another extratropical cyclone over Scandinavia on October 12.[64][65][66]

Impact and records

While passing northeast of Puerto Rico, light winds associated with Sam's circulation interacted with the typically moist environment and, in conjunction with the normal diurnal cycle, produced locally heavy rainfall on the island on September 28–29. Some street flooding occurred along roads with poor drainage and several mudslides were reported in western communities.[67][68][69] Large swells produced by the hurricane affected portions of the Lesser Antilles through late-September.[70] Although Sam remained more than 900 mi (1,400 km) from the mainland United States, its circulation produced dangerous swells across the Eastern seaboard.[71] Thirty people required rescue from rip currents in New Hanover County, North Carolina. However, there were no injuries or fatalities.[72] In Bermuda, tropical storm warnings and watches were raised on September 30 and remained in effect until October 2. Although the core of Sam remained east of the territory,[73] its broadening wind field brought tropical storm-force winds to the area.[74] Sustained winds of 25–44 mph (40–71 km/h) were measured, with the strongest occurring at higher elevations. A peak gust of 53 mph (85 km/h) was measured at the National Museum of Bermuda. Rainfall during the storm's passage was negligible.[73]

Sam remained a major hurricane for 7.75 days, which was longer than any other Atlantic system this season, and the longest since Hurricane Ivan in 2004.[1][73] Sam's total ACE of 53.8 was the highest for any Atlantic named storm in 2021,[75] and 5th highest overall since 1966.[1]

See also

Notes

  1. ^ A major hurricane is one that ranks at Category 3 or higher on the Saffir–Simpson scale.[2]

References

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This article's tone or style may not reflect the encyclopedic tone used on Wikipedia. See Wikipedia's guide to writing better articles for suggestions. (January 2019) (Learn how and when to remove this message) Type of motorcycle Honda VFR750FVFR750P police variantManufacturerHondaAlso calledInterceptorProduction1986–1997PredecessorHonda VF750FSuccessorVFR800ClassSport bikeEngine748 cc (45.6 cu in), liquid-cooled, DOHC, four-stroke, carburetted, V4Bore / stroke70 mm × …

Martin Brundle Brundle nel 2016 Nazionalità  Regno Unito Automobilismo Categoria Formula 1, 24 Ore di Le Mans Carriera Carriera in Formula 1 Stagioni 1984-1989, 1991-1996 Scuderie  Tyrrell 1984-1986 Zakspeed 1987 Williams 1988 Brabham 1989, 1991 Benetton 1992 Ligier 1993 McLaren 1994 Ligier 1995 Jordan 1996 Miglior risultato finale 6º (1992) GP disputati 165 (158 partenze) Podi 9 Punti ottenuti 98 Carriera nella 24 Ore di Le Mans Stagioni 1987-…

Bagian dari seriReformasi ProtestanSembilan Puluh Lima Dalil Perintis Pierre Vaudès dan Kaum Waldensian John Wycliffe dan golongan Kaum Lollardi Jan Hus dan kaum Husite Girolamo Savonarola dan Kaum Piagnoni Arnaldo da Brescia dan Kaum Arnoldis Gottschalk dari Orbais Ratramnus Klaudius dari Turin Berengarius dari Tours dan Kaum Berengarian Wessel Gansfort Johann Ruchrat von Wesel Johannes von Goch Kaum Sahabat Allah Kaum Pataria Awal Mula Sembilan Puluh Lima Dalil Rapat Negara di Worms Alkitab L…

Disambiguazione – Se stai cercando il film di supereroi del 2015, vedi Avengers: Age of Ultron. Age of Ultronfumetto La copertina americana del crossover Age of Ultron, realizzata da Pablo Manuel Rivera Titolo orig.Age of Ultron Lingua orig.inglese PaeseStati Uniti TestiBrian Michael Bendis DisegniBryan Hitch EditoreMarvel Comics 1ª edizionemarzo 2013 – giugno 2013 Periodicitàtre volte al mese (primi 6 numeri) bimensile (ultimi 4 numeri) Albi10 (completa) Edi…

 本表是動態列表,或許永遠不會完結。歡迎您參考可靠來源來查漏補缺。 潛伏於中華民國國軍中的中共間諜列表收錄根據公開資料來源,曾潛伏於中華民國國軍、被中國共產黨聲稱或承認,或者遭中華民國政府調查審判,為中華人民共和國和中國人民解放軍進行間諜行為的人物。以下列表以現今可查知時間為準,正確的間諜活動或洩漏機密時間可能早於或晚於以下所歸類…

English Indologist (1840–1882) Arthur Coke Burnell Arthur Coke Burnell (11 July 1840 – 12 October 1882) was an English civil servant who served in the Madras Presidency who was also a scholar in Sanskrit and Dravidian languages. He catalogued the Sanskrit manuscripts in southern India, particularly those in the collections of the Tanjore court collections. He was, with Henry Yule, a co-compiler of the Hobson-Jobson, a compendium of Anglo-Indian terms. Life Burnell was born at St…

German prince For other people named Prince Leopold of Saxe-Coburg and Gotha, see Prince Leopold of Saxe-Coburg and Gotha (disambiguation). Prince LeopoldPhotograph, c. 1870Born(1824-01-31)31 January 1824ViennaDied20 May 1884(1884-05-20) (aged 60)ViennaBurialFriedhof am Glockenberg [de], CoburgSpouseConstanze GeigerIssueFranz, Baron of RuttensteinNamesLeopold Franz JuliusHouseSaxe-Coburg and Gotha-KoháryFatherFerdinand, Prince of Saxe-Coburg and Gotha-KoháryMotherPrince…

British historian (1926–2005) Maurice John CowlingBorn(1926-09-06)6 September 1926London, EnglandDied24 August 2005(2005-08-24) (aged 78)Swansea, WalesNationalityBritishAlma materJesus College, CambridgeOccupationHistorianKnown forHis high politics interpretation of modern British history Maurice John Cowling (6 September 1926 – 24 August 2005) was a British historian. A fellow of Peterhouse, Cambridge, for most of his career, Cowling was a leading conservative exponent of the…

Artikel ini bukan mengenai Jalan bebas hambatan. Jalan tol Lingkar Dalam Kota Jakarta Jalan tol (bahasa Inggris: Toll road) adalah jalan yang dikenakan tol—biaya yang dikenakan saat menggunakan suatu jalan—untuk melintasinya sesuai dengan syarat dan ketentuan yang berlaku. Jalan ini merupakan suatu bentuk pemberian tarif pada jalan yang umumnya diterapkan untuk menutupi biaya pembangunan dan perawatan jalan. Penetapan tarif didasarkan pada golongan kendaraan. Bangunan atau tempat fasilit…

Brand name by Intel Components of the Centrino platform. From right, clockwise: Intel PRO/Wireless wireless network adapter, Intel mobile processor, Intel mobile southbridge chipset, and Intel mobile northbridge chipset. Centrino is a brand name of Intel Corporation which represents its Wi-Fi and WiMAX wireless computer networking adapters. Previously the same brand name was used by the company as a platform-marketing initiative. The change of the meaning of the brand name occurred on January 7,…

Overview of history and methods to produce NH3 Ammonia production takes place worldwide, mostly in large-scale manufacturing plants that produce 183 million metric tonnes[1] of ammonia (2021) annually.[2][3] Leading producers are China (31.9%), Russia (8.7%), India (7.5%), and the United States (7.1%). 80% or more of ammonia is used as fertilizer. Ammonia is also used for the production of plastics, fibres, explosives, nitric acid (via the Ostwald process), and intermedia…

View of Castellana Caves The following article shows a list of caves in Italy. Overview Main concentration of Italian caves (Italian: grotte, singular: grotta) is close to the Alps and the Apennine Mountains, principally due to karst.[1] The Italian caves attract around 1.5 million tourists every year.[2] The main Italian tourist caves are Castellana Caves and Frasassi Caves. Other notable show caves are Borgio Verezzi Caves, Castelcivita Caves, Grotta del Cavallone, Grotta Gigan…

Carex archeri Klasifikasi ilmiah Kerajaan: Plantae (tanpa takson): Tracheophyta (tanpa takson): Angiospermae (tanpa takson): Monokotil (tanpa takson): Komelinid Ordo: Poales Famili: Cyperaceae Genus: Carex Spesies: Carex archeri Nama binomial Carex archeriBoott Carex archeri adalah spesies tumbuhan seperti rumput yang tergolong ke dalam famili Cyperaceae. Spesies ini juga merupakan bagian dari ordo Poales. Spesies Carex archeri sendiri merupakan bagian dari genus Carex.[1] Nama ilmiah da…

Balai kota Roissy-en-Brie. Roissy-en-BrieNegaraPrancisArondisemenTorcyKantonRoissy-en-BrieAntarkomunetidak ada pada 2007Pemerintahan • Wali kota (2008-2014) Sylvie Fuchs • Populasi119.693Kode INSEE/pos77390 / 2 Population sans doubles comptes: penghitungan tunggal penduduk di komune lain (e.g. mahasiswa dan personil militer). Roissy-en-Brie merupakan sebuah komune di pinggiran timur Paris, Prancis. Terletak 234 km (145 mi) (14.5 mil) dari pusat kota Paris, …

Grottes d'Ajanta *  Patrimoine mondial de l'UNESCO Coordonnées 20° 32′ 01″ nord, 75° 44′ 59″ est Pays Inde Subdivision Maharashtra, district d'Aurangābād Type Culturel Critères (i) (ii) (iii) (vi) Numérod’identification 242 Région Asie et Pacifique ** Année d’inscription 1983 (7e session) Géolocalisation sur la carte : Inde Grottes d'Ajanta Géolocalisation sur la carte : Maharashtra Grottes d'Ajanta * Descriptif offic…