Jump to content
Brasil Abaixo de Zero

Felipe F

Advisors
  • Content count

    5466
  • Joined

  • Last visited

  • Days Won

    3

Everything posted by Felipe F

  1. Tempo Severo EUA - 2018

    SPC emitiu um risco leve para áreas do Texas, Louisiana e Mississípi. Um aviso de tornado está em vigor no momento e mais cedo tivemos a ocorrência de um tornado no Texas. Modelos mantém a ameça de tempo severo para sábado no Dixie Alley.
  2. Tempo Severo EUA - 2018

    2018 segue bem calmo em relação ao tempo severo nos EUA, bem diferente de 2017 que começou muito ativo. Até o momento cerca de 30 tornados foram confirmados, enquanto em 2017 neste mesmo período já havia mais de 200. Hoje existe um pequeno risco de tornados entre OK/TX. Os modelos já apontam a possibilidade de algo mais significativo para o próximo sábado no Dixie Alley.
  3. Vulcões

    Monte Sinabung teve uma forte erupção hoje.
  4. Vulcões

    Acompanhamento de Vulcões
  5. Aqui também tive muito calor hoje. No Inmet variou de 17,2°C a 30,7°C. Faz 4 dias que não chove. Pelos modelos teremos boas chuvas após o dia 18 de Fevereiro. 😀
  6. Patrocínio teve um começo de madrugada nublado, o que atrapalhou um pouco a queda da temperatura. Mesmo assim tivemos mínima de 14,9°C. Durante a tarde o sol apareceu entre poucas nuvens ao longo de todo dia e a máxima chegou a 30,6°C, sendo a primeira sub30 do mês.
  7. Patrocínio teve um dia de muito calor, com a temperatura variando de 18,8°C a 28,9°C. Houve diversas pancadas de chuva ao longo do dia, sendo a mais forte ocorrida às 18h. Houve locais da cidade com 60 mm em 1h, o que causou inundações nas avenidas baixas da cidade.
  8. Sobre Irma em 2016. A 199 mph Wind Gust in Irma: a Personal Weather Station Record Dr. Jeff Masters · January 30, 2018, 3:28 PM EST Above: Hurricane Irma as seen in moonlight by the VIIRS instrument on the Suomi satellite at approximately 3 am EDT Wednesday, September 6, 2017. Barbuda was in the southeastern eyewall of Irma at this time, and Irma was headed west-northwest towards St. Barts. The eye of Irma passed over St. Barts about three hours after this image was taken (radar loop here). Puerto Rico is visible at the left of the image. Image credit: NASA. Hurricane Irma smashed through the Leeward Islands in the early morning hours of September 6, 2017, as a catastrophic Category 5 hurricane with 185 mph winds. Irma clobbered the islands of Barbuda, Saint Barthélemy (commonly called St. Barts), Saint Martin/Sint Maarten, and the British Virgin Islands at peak strength, making it the strongest Atlantic landfalling hurricane in recorded history. As typically occurs during a Cat 5 landfall, wind measurements during eyewall passage were hard to find, since the storm destroyed the measurements sites and/or knocked out their power. The highest winds at an official site during Irma’s passage were on Barbuda, where a NOAA National Ocean Service station reported sustained winds of 118 mph (190 km/h) with a gust to 155 mph (249 km/h) at 12:54 am EDT September 6, before the instrument failed. Figure 1. Serge Brin’s personal weather station (PWS) on St. Barts (ISAINTBA3), after Hurricane Irma had severed the 21-foot pole housing the anemometer. The view is to the northwest from the north coast of St. Barts. Image credit: Serge Brin. However, Serge Brin, owner of a Weather Underground personal weather station (PWS) on St. Barts (ISAINTBA3), wrote me to report that he received a direct hit by Irma, but his PWS stayed up during passage of the front eyewall and a portion of the back eyewall, before flying debris severed the pole housing the anemometer. Before failing, the station measured the highest wind gust ever recorded by a PWS on the Weather Underground network: 199 mph (320.3 kph). It is quite rare to see a wind gust measurement this high; in fact, there have only been four reliably measured wind gusts in world history stronger than that. The world record wind gust is 253 mph at Barrow Island, Australia, during Tropical Cyclone Olivia in 1996. The second highest wind speed ever measured was 231 mph (370 km/hr) on the top of Mt. Washington, New Hampshire, on April 12, 1934, during passage of an extratropical storm. Third place is a 211 mph gust in Cuba during Hurricane Gustav in 2008, and the fourth highest wind gust on record was the 207 mph gust measured in Greenland at Thule Air Force Base on March 6, 1972. The instrument that measured the 199 mph gust in Irma was a Davis Vantage Pro II. This instrument has a 200 mph (322 kph) design limit to its wind speed measurements, so it is quite possible that the actual winds were higher. Mr. Brin reported: “Just after the big gust, the counter suddenly went to zero for about thirty seconds, then, normal operation resumed. Does this malfunction indicate exceeding of the capacity of the anemometer? The question remains!” Peak sustained winds over a 30-minute period at Mr. Brin's PWS site were 106 mph (170.6 kph). These must be increased by a significant factor to convert to the 1-minute average sustained winds that the National Hurricane Center uses. Figure 2. Image of the console display of Serge Brin’s personal weather station on St. Barts (ISAINTBA3) during the peak winds of Hurricane Irma, when the anemometer recorded a 320.3 kph (199 mph) wind gust. Image credit: Serge Brin. A few caveats to the measurement: standard wind measurements at airports are done at a height of 10 meters (33 feet) above flat ground. The ISAINTBA3 instrument was on a 21-foot high mast above ground, so it measured a lower wind speed than if it had been at the standard 33-foot height above ground level. However, the station was situated on a bluff at 50 feet elevation overlooking the ocean; this exposure likely increased the winds above what a measurement station on flat ground would have seen. The bluff faced to the northwest towards the ocean, and the peak winds were measured when the front eyewall of Irma was bringing north-northwest winds directly from the ocean to the site. The minimum pressure measured at the site during passage of the eye was 916 mb--the same as that recorded at the St. Barts airport. Mr. Brin estimated a storm tide of 10 to 12 feet, and the calm of the eye lasted almost one hour and a half. He heard his roosters singing outside during the calm of the eye. His house was damaged, but not excessively. Figure 3. A door hinge embedded in a tree behind Serge Brin’s house on St. Barts, after passage of Hurricane Irma. Image credit: Serge Brin. Mr. Brin had this to say about the experience; “My weather station will be rebuilt before the next hurricane season, even stronger than before ! I have been interested in hurricanes since I was ten, with the passage of hurricanes David and Frederic in 1979, and in 1995, Luis had allowed me to see the power of destruction that could generate a powerful hurricane.” A huge thanks go to Serge for sharing his data and experience with us! The National Hurricane Center plans to mention the measurement in their final report on Irma, though the gust will not be classified as an official measurement.
  9. Choveu forte ontem e hoje em Patrocínio, ajudando a quase chegarmos na média de Janeiro. A temperatura ficou dentro da média. Destaco que não houve nenhum dia com máxima sub25, algo incomum e indicativo que não houve nenhuma ZCOU ou ZCAS neste mês.
  10. Janeiro em Patrocínio/MG: Média de mínimas: 16,9°C (-0,6°C) Média de máximas: 29,2°C (+0,7°C) Precipitação total: 211mm (-19mm) Menor Mínima: 13,0ºC em 19/01 Maior Mínima: 19,5ºC em 30/01 Menor Máxima: 25,9ºC em 06/01 Maior Máxima: 32,4ºC em 22/01
  11. Dados da Sismet Cooxupé. Somente Alfenas terminou acima da média. Municípios Acumulado Mensal Histórico Mensal Alfenas 315,0 250,4 Cabo Verde 225,6 333,9 Caconde 203,0 332,9 Campestre 180,4 298,4 Campos Gerais 195,4 238,3 Carmo do Rio Claro 173,0 284,7 Guaxupé 211,0 295,2 Monte Carmelo 168,0 325,0 Monte Santo de Minas 287,4 298,6 Nova Resende 172,2 288,5 Rio Paranaíba 190,6 283,0 São José do Rio Pardo 199,8 349,5 Serra do Salitre 167,6 350,6
  12. Capital do Irã teve uma boa nevada.
  13. Fehi passou próximo da Nova Caledônia como uma fraca tempestade tropical (categoria 1 na escala australiana), trazendo chuvas e ventos para região, mas nada significativo. O sistema está em uma área com alto cisalhamento, por isso não conseguiu se organizar. O sistema poderia impactar sul da Nova Zelândia como um ciclone extratropical no dia 1º de Fevereiro.
  14. Cebile se fortaleceu para categoria 4, porém após um ciclo de substituição da parede do olho, perdeu intensidade e agora está na categoria 3, com ventos sustentados em 175 km/h e rajadas de 205 km/h.
  15. INVEST 93P segue se organizando e tem altas chances e se tornar um ciclone tropical nas próximas 24 horas. De acordo com os modelos, poderia afetar a Nova Caledônia na segunda. Primeiro nome da lista é Fehi.
  16. Tempestade tropical Cebile se formou no Índico Sudoeste. Como já foi informado, os principais modelos (ECMWF e GFS) indicam que o sistema será um poderoso ciclone e irá se manter em alto-mar durante todo período em atividade.
  17. Miramar, Buenos Aires, Argentina dia 23 de Janeiro. Foto: Mario Bohh Próximo de Buenos Aires - Foto: David Skliarevsky
  18. Vulcões

    Vulcão Mayon segue em erupção! Devido as fortes chuvas que estão ocorrendo na região, existe a possibilidade de ocorrência de lahar (lama composta por materiais piroclásticos e água).
×