André L P Souza Posted October 28, 2025 at 10:29 PM Share Posted October 28, 2025 at 10:29 PM Em 28/10/2025 em 17:46, LeoP disse: pessoal, eu não costumo acompanhar furacões e entendo pouco disso então pergunto aos especialistas: vento sustentado é aquele constante em determinado período, que independe de rajadas pontuais, certo? então, os vídeos que eu vi até agora do furacão não parecem ser de ventos da ordem de 300 km/h, alguns inclusive lembram o início de algumas tempestades de verão aqui no Brasil, com velocidade estimada (pelo movimento das árvores) em 70/100 km/h. vídeos recentes de microexplosões até já me impressionaram mais. essa métrica é apenas em determinado ponto do sistema e por isso os vídeos não registram? ou esses valores não se referem à superfície, mas em algum ponto mais alto da atmosfera? talvez, ainda, esses ventos não são registrados porque nenhuma estrutura suportaria... Alguém sabe explicar isso? Bom... Existem 3 casos. Primeiro: os ventos sustentados (Seja 1 min, seja 10 min) são gerados pelo ciclone através da baroclinia (Diferença de pressão de quando o furacão "suga" calor e material particulado para se sustentar) e também da temperatura da água. Como a terra tem muito atrito, os ventos sustentados ficam mais fracos a medida que se afasta da tormemta. Segundo: sim, os ventos sustentados independem das rajadas. A rajada é quando uma coluna de ar frio empurra o ar quente para cima favorecendo a queda da pressão atmosférica na área onde atua. Terceiro: sim, é em determinado ponto do sistema pois existem vários métodos de monitorar tormentas. Imagens de satélites, boias meteocenográficas, aviões de rastreio, birutas, barômetros etc.. Entretanto, às vezes estes equipamentos falham pois os furacões às vezes geram tornados e as medições ficam comprometidas. 7 1 Link to comment Share on other sites More sharing options...
jrmartinisp Posted October 29, 2025 at 12:14 AM Share Posted October 29, 2025 at 12:14 AM (edited) Em 28/10/2025 em 18:11, jayvillao disse: As imagens que vemos são de lugares um pouco mais distantes do olho, onde há energia elétrica pras câmeras, provavelmente pro tamanho da ilha em relação ao furacão estão a leste onde o vento está em torno de 150 km/h Provavelmente é isso msm, as regiões mais afetadas são destruídas é difícil algo ficar intacto para registrar ainda mais ao vivo No furacão Irma de 2017 quando passou pela ilha de San Martin me lembro de uma Brasileira que estudava lá e que postou bastante coisa deste evento e foi um regaço, o apartamento que ela vivia ficou destruído, ela poderia ter morrido se tivesse ficado lá. Edited October 29, 2025 at 12:15 AM by jrmartinisp 5 Link to comment Share on other sites More sharing options...
DaviOlrb Posted October 29, 2025 at 01:24 AM Share Posted October 29, 2025 at 01:24 AM Primeiras imagens da região mais atingida. https://x.com/sainty876/status/1983314903441256694 https://x.com/JamaicaConstab/status/1983311743616221615 4 2 Link to comment Share on other sites More sharing options...
Felipe F Posted October 29, 2025 at 02:14 AM Share Posted October 29, 2025 at 02:14 AM Black River, Jamaica 6 1 Link to comment Share on other sites More sharing options...
Felipe F Posted October 29, 2025 at 02:18 AM Share Posted October 29, 2025 at 02:18 AM Melissa agora segue para Cuba, onde vai chegar como um grande furacão 7 Link to comment Share on other sites More sharing options...
André L P Souza Posted October 29, 2025 at 02:27 AM Share Posted October 29, 2025 at 02:27 AM URGENTE! MELISSA FOI REBAIXADO À CATEGORIA 3. SUA PRESSÃO ATMOSFÉRICA AUMENTOU PARA 950 HPA E O OS VENTOS SUSTENTADOS DE 1 MINUTO CAÍRAM PARA 205 KM/H. MANTÉM-SE O ALERTA DE PERIGO PARA BAHAMAS, CUBA E BERMUDA PARA AS PRÓXIMAS HORAS. 000 WTNT33 KNHC 282341 TCPAT3 BULLETIN Hurricane Melissa Intermediate Advisory Number 30A NWS National Hurricane Center Miami FL AL132025 800 PM EDT Tue Oct 28 2025 ...POWERFUL MELISSA MOVING TOWARD EASTERN CUBA... ...CONDITIONS EXPECTED TO DETERIORATE RAPIDLY OVER THE NEXT SEVERAL HOURS... SUMMARY OF 800 PM EDT...0000 UTC...INFORMATION ---------------------------------------------- LOCATION...18.8N 77.2W ABOUT 50 MI...80 KM ENE OF MONTEGO BAY JAMAICA ABOUT 160 MI...260 KM SW OF GUANTANAMO CUBA MAXIMUM SUSTAINED WINDS...125 MPH...205 KM/H PRESENT MOVEMENT...NNE OR 30 DEGREES AT 8 MPH...13 KM/H MINIMUM CENTRAL PRESSURE...950 MB...28.06 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Hurricane Warning is in effect for... * Jamaica * Cuban provinces of Granma, Santiago de Cuba, Guantanamo, Holguin, and Las Tunas * Southeastern and Central Bahamas A Hurricane Watch is in effect for... * Bermuda A Tropical Storm Warning is in effect for... * Haiti * Cuban province of Camaguey * Turks and Caicos Islands A Hurricane Warning means that hurricane conditions are expected somewhere within the warning area. Residents in Jamaica should remain in a safe shelter. In the warning area in Cuba, residents should seek safe shelter immediately. In the Bahamas, preparations to protect life and property should be rushed to completion. A Hurricane Watch means that hurricane conditions are possible within the watch area. A watch is typically issued 48 hours before the anticipated first occurrence of tropical-storm-force winds, conditions that make outside preparations difficult or dangerous. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 800 PM EDT (0000 UTC), the center of Hurricane Melissa was located near latitude 18.8 North, longitude 77.2 West. Melissa is moving toward the north-northeast near 8 mph (13 km/h). A turn toward the northeast is expected later this evening, and a faster motion in that direction is expected on Wednesday and Thursday. On the forecast track, the core of Melissa is expected to move over eastern Cuba later tonight and early Wednesday morning, move across the southeastern or central Bahamas later on Wednesday, and approach Bermuda Thursday and Thursday night. Maximum sustained winds are near 125 mph (205 km/h) with higher gusts. Melissa is a category 3 hurricane on the Saffir-Simpson Hurricane Wind Scale. Melissa is expected to remain a powerful hurricane when it moves across Cuba, the Bahamas, and near Bermuda. Hurricane-force winds extend outward up to 30 miles (45 km) from the center and tropical-storm-force winds extend outward up to 195 miles (315 km). The estimated minimum central pressure based on data from a NOAA Hurricane Hunter aircraft is 950 mb (28.06 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Melissa can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT3 and WMO header WTNT43 KNHC. WIND: The damaging winds are expected to gradually subside across Jamaica, but it is advised to remain in a safe shelter until sunrise. Hurricane conditions are expected in the warning area in Cuba later tonight through Wednesday morning. Tropical storm conditions are expected in Haiti tonight and Wednesday. Hurricane conditions are expected in the southeastern and central Bahamas on Wednesday. Tropical storm conditions are expected and hurricane conditions are possible in the Turks and Caicos Islands on Wednesday. Hurricane conditions are possible on Bermuda Thursday and Thursday night. RAINFALL: Melissa is expected to bring an additional 6 to 12 inches across Jamaica, where storm total amounts will be between 12 to 24 inches. Isolated areas near 30 inches will be possible over mountainous terrain. Ongoing catastrophic flash flooding and numerous landslides will continue through Tuesday night. For eastern Cuba, storm total rainfall of 10 to 20 inches is expected through Wednesday, with local amounts to 25 inches expected over mountainous terrain. This will cause life-threatening and potentially catastrophic flash flooding with numerous landslides. Over the Southeast Bahamas, storm total rainfall of 5 to 10 inches is expected through Wednesday, which will result in areas of flash flooding. For the Turks and Caicos, rainfall totals of 1 to 3 inches are expected. Heavy rain may begin to affect Bermuda Thursday night. Over southern Hispaniola, additional rainfall of 2 to 6 inches is expected through Wednesday, with storm total local maxima of 40 inches possible. For a complete depiction of forecast rainfall associated with Melissa, please see the National Weather Service Storm Total Rainfall Graphic, available at hurricanes.gov/graphics_at3.shtml?rainqpf STORM SURGE: On the northwest coast of Jamaica, near Montego Bay, there is the possibility of 2 to 4 feet of storm surge above ground level. Storm surge flooding on the southern coast of Jamaica should subside later tonight. There is a potential for significant storm surge along the southeast coast of Cuba through early Wednesday. Peak storm surge heights could reach 8 to 12 feet above normal tide levels, near and to the east of where the center of Melissa makes landfall. This storm surge will be accompanied by large and destructive waves. Minor coastal flooding is possible in bays and inlets along the north coast of eastern Cuba. Storm surge of 5 to 8 ft above normally dry ground is possible in the southeastern Bahamas on Wednesday, and 2 to 4 ft above normally dry ground in the Turks and Caicos Islands on Wednesday. Minor coastal flooding is expected along the coast of Haiti. SURF: Swells generated by Melissa are expected to affect portions of Hispaniola, Jamaica, eastern Cuba, and the Cayman Islands during the next day or so, causing life-threatening surf and rip current conditions. These swells will reach the Bahamas and the Turks and Caicos Islands overnight, and Bermuda later this week. Please consult products from your local weather office. NEXT ADVISORY ------------- Next complete advisory at 1100 PM EDT. $$ Forecaster Cangialosi 4 Link to comment Share on other sites More sharing options...
Felipe F Posted October 29, 2025 at 02:28 AM Share Posted October 29, 2025 at 02:28 AM Melissa empatou com Laboy Day, 1935 como furacão com menor pressão a fazer landfall no Atlântico. O sistema fez ladfall como pressão de 892 mbar. O NHC já informou que mais detalhes vão estar na reanálise, então quem sabe poderia até ser reduzido esse valor. GIF DO HISTÓRICO LANDFALL 11 Link to comment Share on other sites More sharing options...
Felipe F Posted October 29, 2025 at 02:29 AM Share Posted October 29, 2025 at 02:29 AM 7 Link to comment Share on other sites More sharing options...
Felipe F Posted October 29, 2025 at 02:37 AM Share Posted October 29, 2025 at 02:37 AM 10 Link to comment Share on other sites More sharing options...
Tavares Posted October 29, 2025 at 03:01 PM Share Posted October 29, 2025 at 03:01 PM Vídeo alegadamente sendo da freguesia de Saint Elisabeth mas não menciona qual localidade da freguesia, a região oeste recebeu ventos muito mais intensos. Enfim, no vídeo não notei demolições, só destelhamentos e desfolhamentos, plenamente sobrevivíveis. 1103001894_St.Elizabeththismorning.Theaftermath.Tracking.mp4 8 Link to comment Share on other sites More sharing options...
jayvillao Posted October 30, 2025 at 01:30 AM Share Posted October 30, 2025 at 01:30 AM Black River, Jamaica 7 Link to comment Share on other sites More sharing options...
Felipe F Posted October 30, 2025 at 04:20 AM Share Posted October 30, 2025 at 04:20 AM 5 1 Link to comment Share on other sites More sharing options...
Felipe F Posted October 30, 2025 at 04:21 AM Share Posted October 30, 2025 at 04:21 AM https://x.com/i/status/1983650175358042222 4 1 Link to comment Share on other sites More sharing options...
Renan Posted October 31, 2025 at 01:53 AM Share Posted October 31, 2025 at 01:53 AM E pelo visto o dado mais importante de todos, que é o número de vítimas fatais, será bem reduzido. Meu temor era que houvesse uma chacina , mas os jamaicanos se mostraram preparados. Por enquanto são apenas 4 mortes confirmadas. 2 Link to comment Share on other sites More sharing options...
Felipe F Posted November 5, 2025 at 02:33 AM Share Posted November 5, 2025 at 02:33 AM Número de mortos pelo ciclone Melissa chegou a 83 e ainda tem dezenas desaparecidos. 3 3 Link to comment Share on other sites More sharing options...
ricardosilva Posted November 5, 2025 at 10:22 PM Share Posted November 5, 2025 at 10:22 PM Em 30/10/2025 em 22:53, Renan disse: E pelo visto o dado mais importante de todos, que é o número de vítimas fatais, será bem reduzido. Meu temor era que houvesse uma chacina , mas os jamaicanos se mostraram preparados. Por enquanto são apenas 4 mortes confirmadas. Acho que infelizmente não foi o caso. Agora com o passar dos dias vai ficando mais claro o estrago que deixou na ilha. 2 Link to comment Share on other sites More sharing options...
Daniel Vieira Posted November 7, 2025 at 02:37 PM Share Posted November 7, 2025 at 02:37 PM Em 05/11/2025 em 19:22, ricardosilva disse: Acho que infelizmente não foi o caso. Agora com o passar dos dias vai ficando mais claro o estrago que deixou na ilha. Chama atenção o número no Haiti mais da metade das fatalidades confirmadas até o momento são de lá. 3 Link to comment Share on other sites More sharing options...
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