Tropical activity

Track active tropical systems across the basins, with observations, forecasts, model guidance and available imagery.

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Active and monitored systems

Potential formation and tropical ensemble

Explore the model's first detections of new systems and the tracks of the 50 perturbed ECMWF ensemble members.

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Como interpretar

Colours show the percentage of the 50 members with first detection after H0 within each 5° × 5° cell and the selected window. Each member counts once per cell. Systems already present at H0 are excluded. Cell percentages must not be added together.

Cálculo Luso Meteo a partir das trajetórias ECMWF. A primeira deteção pelo modelo não confirma a formação de um ciclone tropical. As linhas representam cenários individuais; as posições mostram apenas dados existentes no prazo selecionado.

Fonte: ECMWF Open Data · CC BY 4.0

Notas e fontes

As observações, previsões e imagens são apresentadas conforme a disponibilidade de cada sistema. Os produtos gráficos são guardados localmente para esta página; a origem e o ciclo dos dados são identificados junto de cada produto.

Forecast tracks and intensities may differ between techniques and updates. Model guidance is neither an official forecast nor a probability assessment.

📖 Glossary
AIFS e IFS
Modelos do ECMWF. O IFS utiliza equações físicas da atmosfera; o AIFS utiliza inteligência artificial.
ATCF and techniques
Cyclone tracking data format. Each technique identifies an official forecast, a model or a model consensus.
Bacia tropical
Ocean basin used to organise tropical system monitoring.
Categoria e Saffir–Simpson
Hurricanes are classified from 1 to 5 by maximum 1-minute sustained wind. The category does not measure rainfall, flooding or storm surge.
Ciclo, UTC e prazo
O ciclo identifica a hora inicial de uma previsão. UTC é a referência horária universal; +24 h significa 24 horas após o início desse ciclo.
CIMSS, CIRA e RAMMB
Research and monitoring institutions and products providing tropical cyclone analyses and imagery.
Forecast cone
Area of uncertainty in the future centre position. It does not represent the cyclone's size or delimit all areas that may be affected.
Consenso
Forecast combining results from several techniques or models.
Tropical depression and storm
Sistemas tropicais organizados. Uma depressão tem vento sustentado inferior a 34 nós; uma tempestade tropical começa nos 34 nós.
Dvorak, ADT e Dvorak digital
Métodos que estimam a intensidade a partir de imagens de satélite. ADT é a técnica avançada automatizada; as estimativas não são medições diretas do vento.
Dvorak subjetivo corrigido
Product presenting bias-corrected subjective Dvorak estimates, according to the source methodology.
ECMWF
European Centre for Medium-Range Weather Forecasts.
Ensemble
A set of forecasts used to explore scenarios and uncertainty. The tropical product shown uses the 50 available perturbed ECMWF members.
Potential formation or genesis
First detections of new systems by the model. A detection does not confirm that a cyclone will actually form.
Hurricane and typhoon
Regional names for intense tropical cyclones. Classification depends on the responsible agency and the averaging period used for mean wind.
GFS, GEFS, HAFS, HMON e HWRF
Modelos ou sistemas de previsão. GFS e GEFS são globais; HAFS, HMON e HWRF são sistemas especializados na previsão de ciclones.
GOES, IR e Enhanced IR
GOES identifica satélites meteorológicos. IR significa infravermelho; Enhanced IR aplica uma escala de cores às temperaturas observadas para destacar estruturas das nuvens.
hPa, mb, kt e nmi
hPa and mb are equivalent pressure units. kt means knots: 1 knot equals 1.852 km/h. nmi means nautical miles: 1 nmi equals 1.852 km.
Invest
Disturbance under special monitoring. This designation does not mean a tropical cyclone has formed.
JMA, JTWC, NHC e NOAA
Entidades que produzem análises ou previsões. JMA é a agência meteorológica japonesa; JTWC é um centro de aviso de tufões; NHC é o centro de furacões dos EUA; NOAA é a agência oceânica e atmosférica norte-americana.
Mediana
Central value of the available members' ordered results. It does not necessarily correspond to a track produced by an individual member.
Control member and deterministic forecast
The control is the ensemble reference without the perturbations applied to other members. The deterministic forecast shows a single evolution calculated by the model.
Membros perturbados
Forecasts with small changes to initial conditions or model representation, used to explore uncertainty.
T-number, Raw T, Final T and CI
Indicadores de intensidade Dvorak. Raw T é a estimativa inicial; Final T incorpora os ajustes do método; CI é o índice usado na estimativa da intensidade atual.
OFCL
Official NHC forecast code in the ATCF data.
Central pressure
Estimated or measured pressure near the centre. In air reconnaissance, the minimum shown refers to the mission's available data.
Formation probability
In the ECMWF product shown, the percentage of members meeting the detection criterion within the specified area and period. This is not equivalent to official probabilities published by forecasting centres.
Uncertainty radius
Distance used to represent uncertainty in a forecast position, as defined by the responsible agency's product.
Air reconnaissance, mission and HDOB
Observações recolhidas por aviões. Uma missão agrupa o voo; HDOB identifica mensagens com observações meteorológicas de elevada frequência.
SFMR and flight-level wind
SFMR estimates surface wind using microwaves. Wind measured at flight altitude is a different variable and must not be compared directly with surface wind.
Sistema extratropical
System whose structure and energy source differ from those of a tropical cyclone. It can still produce strong winds and other impacts.
Official track
Future centre positions forecast by the responsible agency. These differ from individual model tracks.
1- or 10-minute mean wind
Período usado para calcular o vento sustentado. O NHC utiliza 1 minuto e a JMA utiliza 10 minutos; estes valores não são diretamente equivalentes.
Vmax and sampled maxima
Vmax identifies the product's maximum wind. During a flight, the sampled maximum depends on available observations and may not capture the cyclone's actual maximum.
Vortex
Air reconnaissance message with information on the centre passage, including central pressure when available.
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