Previsão e Seguimento de Furacões (Atlântico 2025)
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Aristocrata
Super Célula
StormRic
Furacão
Se fôr, é bastante incompleto, mas parece haver uma atracção de Imelda pelo Humberto, para cúmulo do azar de Bermuda.
Tempestade Tropical Imelda intensificar-se-á para furacão durante a próxima madrugada. A trajectória não podia ser pior no que diz respeito ao impacto em Bermuda: landfall ou muito próximo com o sector sul/sueste abrangendo toda a ilha.
000
WTNT44 KNHC 292053
TCDAT4
Tropical Storm Imelda Discussion Number 13
NWS National Hurricane Center Miami FL AL092025
500 PM EDT Mon Sep 29 2025
Since the prior advisory, Imelda's structure on satellite imagery
continues to improve. Curved bands are now wrapping around the
western side of the tropical storm's circulation, and the last few
fixes from the NOAA and Air Force Reserve Hurricane Hunters did show
enhanced winds wrapping around the western side, becoming more
symmetric, though some northward tilt with height was still
persisting on the last Tail Doppler Radar (TDR) swath from the
NOAA-P3 aircraft. Satellite intensity estimates have continued to
gradually rise since that time, so the initial intensity is being
raised to 55 kt this advisory, in best agreement with the SAB
subjective Dvorak fix of T3.5/55-kt and the latest SATCON intensity
estimate of 54 kt.
Imelda continues to move northward, estimated at 360/8 kt. This
motion should continue through tonight, but as Humberto erodes the
steering influence of a subtropical ridge east of Bermuda, the
cyclone is expected to make a sharp turn to the east-northeast as
the storm steering becomes dominated by the deep-layer trough that
is digging southward upstream of Imelda. The latest track guidance
trajectory is quite similar to the prior cycle, though it has once
again shifted a bit faster beyond 36 h. There also remains a
substantial amount of along-track spread in both the deterministic
and ensemble guidance this afternoon. The NHC track forecast is a
little faster than the prior cycle, once again attempting to blend
the HCCA and Google DeepMind ensemble mean (GDMI). Based on the
forecast track, tropical storm conditions are expected to begin on
the Island of Bermuda in about 48 h, and in response, the Bermuda
Weather Service has issued a Hurricane Watch for the island this
advisory.
Further intensification is expected over the next several days as
Imelda remains in a low to moderate vertical wind shear environment
along with sufficient mid-level moisture and warm sea-surface
temperatures above 28 C. In 48-60 h, the shear starts quickly
increasing, but a favorable trough interaction may temper this
negative factor initially. This interaction may enhance the winds
along the cyclone's western flank, as seen in the most recent set of
hurricane-regional model runs. These enhanced winds may then evolve
into a "sting jet" like feature as the system becomes extratropical
in the 60-72 h time frame. The exact timing of this transition
remains difficult to forecast, since the cyclone will still be under
fairly warm SSTs at 60-72 h. The official intensity forecast is on
the high side of the guidance envelope, but near the HCCA consensus
aid.
KEY MESSAGES:
1. Imelda is expected to intensify into a hurricane on Tuesday with
the cyclone approaching Bermuda during the day Wednesday as a
hurricane. A Hurricane Watch is now in effect for the island of
Bermuda due to the expected onset of tropical storm conditions
beginning Wednesday afternoon.
2. Tropical storm conditions are expected to continue for another
few hours on Great Abaco and Grand Bahama island in the northwestern
Bahamas.
2. Rainfall associated with Tropical Storm Imelda will continue to
impact the Bahamas through tonight, which may produce flash and
urban flooding. Locally heavy rainfall across the coastal Carolinas
could cause isolated flash and urban flooding through tonight.
3. Swells and high surf from both Humberto and Imelda are expected
to produce dangerous marine conditions and rip currents along much
of the East Coast of the United States during the next several days.
FORECAST POSITIONS AND MAX WINDS
INIT 29/2100Z 27.7N 77.3W 55 KT 65 MPH
12H 30/0600Z 28.4N 76.8W 65 KT 75 MPH
24H 30/1800Z 29.3N 75.0W 70 KT 80 MPH
36H 01/0600Z 30.4N 72.2W 75 KT 85 MPH
48H 01/1800Z 31.7N 67.8W 80 KT 90 MPH
60H 02/0600Z 33.3N 62.3W 85 KT 100 MPH
72H 02/1800Z 35.0N 56.8W 75 KT 85 MPH...POST-TROP/EXTRATROP
96H 03/1800Z 39.0N 50.0W 55 KT 65 MPH...POST-TROP/EXTRATROP
120H 04/1800Z 43.7N 47.6W 45 KT 50 MPH...POST-TROP/EXTRATROP
$$
Forecaster Papin
WTNT44 KNHC 292053
TCDAT4
Tropical Storm Imelda Discussion Number 13
NWS National Hurricane Center Miami FL AL092025
500 PM EDT Mon Sep 29 2025
Since the prior advisory, Imelda's structure on satellite imagery
continues to improve. Curved bands are now wrapping around the
western side of the tropical storm's circulation, and the last few
fixes from the NOAA and Air Force Reserve Hurricane Hunters did show
enhanced winds wrapping around the western side, becoming more
symmetric, though some northward tilt with height was still
persisting on the last Tail Doppler Radar (TDR) swath from the
NOAA-P3 aircraft. Satellite intensity estimates have continued to
gradually rise since that time, so the initial intensity is being
raised to 55 kt this advisory, in best agreement with the SAB
subjective Dvorak fix of T3.5/55-kt and the latest SATCON intensity
estimate of 54 kt.
Imelda continues to move northward, estimated at 360/8 kt. This
motion should continue through tonight, but as Humberto erodes the
steering influence of a subtropical ridge east of Bermuda, the
cyclone is expected to make a sharp turn to the east-northeast as
the storm steering becomes dominated by the deep-layer trough that
is digging southward upstream of Imelda. The latest track guidance
trajectory is quite similar to the prior cycle, though it has once
again shifted a bit faster beyond 36 h. There also remains a
substantial amount of along-track spread in both the deterministic
and ensemble guidance this afternoon. The NHC track forecast is a
little faster than the prior cycle, once again attempting to blend
the HCCA and Google DeepMind ensemble mean (GDMI). Based on the
forecast track, tropical storm conditions are expected to begin on
the Island of Bermuda in about 48 h, and in response, the Bermuda
Weather Service has issued a Hurricane Watch for the island this
advisory.
Further intensification is expected over the next several days as
Imelda remains in a low to moderate vertical wind shear environment
along with sufficient mid-level moisture and warm sea-surface
temperatures above 28 C. In 48-60 h, the shear starts quickly
increasing, but a favorable trough interaction may temper this
negative factor initially. This interaction may enhance the winds
along the cyclone's western flank, as seen in the most recent set of
hurricane-regional model runs. These enhanced winds may then evolve
into a "sting jet" like feature as the system becomes extratropical
in the 60-72 h time frame. The exact timing of this transition
remains difficult to forecast, since the cyclone will still be under
fairly warm SSTs at 60-72 h. The official intensity forecast is on
the high side of the guidance envelope, but near the HCCA consensus
aid.
KEY MESSAGES:
1. Imelda is expected to intensify into a hurricane on Tuesday with
the cyclone approaching Bermuda during the day Wednesday as a
hurricane. A Hurricane Watch is now in effect for the island of
Bermuda due to the expected onset of tropical storm conditions
beginning Wednesday afternoon.
2. Tropical storm conditions are expected to continue for another
few hours on Great Abaco and Grand Bahama island in the northwestern
Bahamas.
2. Rainfall associated with Tropical Storm Imelda will continue to
impact the Bahamas through tonight, which may produce flash and
urban flooding. Locally heavy rainfall across the coastal Carolinas
could cause isolated flash and urban flooding through tonight.
3. Swells and high surf from both Humberto and Imelda are expected
to produce dangerous marine conditions and rip currents along much
of the East Coast of the United States during the next several days.
FORECAST POSITIONS AND MAX WINDS
INIT 29/2100Z 27.7N 77.3W 55 KT 65 MPH
12H 30/0600Z 28.4N 76.8W 65 KT 75 MPH
24H 30/1800Z 29.3N 75.0W 70 KT 80 MPH
36H 01/0600Z 30.4N 72.2W 75 KT 85 MPH
48H 01/1800Z 31.7N 67.8W 80 KT 90 MPH
60H 02/0600Z 33.3N 62.3W 85 KT 100 MPH
72H 02/1800Z 35.0N 56.8W 75 KT 85 MPH...POST-TROP/EXTRATROP
96H 03/1800Z 39.0N 50.0W 55 KT 65 MPH...POST-TROP/EXTRATROP
120H 04/1800Z 43.7N 47.6W 45 KT 50 MPH...POST-TROP/EXTRATROP
$$
Forecaster Papin
Anexos
Aristocrata
Super Célula
Parece que o Efeito Fujiwara é agora apenas uma hipótese académica.
A Bermuda é um excelente habitat para quem gostar de apanhar tempestades tropicais nesta altura do ano.
O efeito combinado desta 2 tempestades garante condições duras para lá, no mínimo de tempestade tropical, e com grande probabilidade também de furacão...
Deixo aqui esta curiosidade no mapa do NHC:
A Bermuda é um excelente habitat para quem gostar de apanhar tempestades tropicais nesta altura do ano.
O efeito combinado desta 2 tempestades garante condições duras para lá, no mínimo de tempestade tropical, e com grande probabilidade também de furacão...
Deixo aqui esta curiosidade no mapa do NHC:
Aristocrata
Super Célula
Boa noite.
Esta madrugada\manhã (hora da Bermuda), o furacão IMELDA poderá atingir em cheio a ilha como categoria 2 (~90 nós = ~160 km\h).
Deverá aumentar um pouco de intensidade ao chegar à ilha (de 85 para 90 nós), perdendo depois aos poucos as característica tropicais, numa transição para tempestade extra-tropical.
Na imagem seguinte vemos também o remanescente do ex-furacão HUMBERTO, que perdeu muito rapidamente as características tropicais.
Esta madrugada\manhã (hora da Bermuda), o furacão IMELDA poderá atingir em cheio a ilha como categoria 2 (~90 nós = ~160 km\h).
Deverá aumentar um pouco de intensidade ao chegar à ilha (de 85 para 90 nós), perdendo depois aos poucos as característica tropicais, numa transição para tempestade extra-tropical.
Na imagem seguinte vemos também o remanescente do ex-furacão HUMBERTO, que perdeu muito rapidamente as características tropicais.
StormRic
Furacão
Imelda fortalecendo-se e a caminho da Bermuda, enquanto Humberto faz a transição para extra-tropical para mais tarde (6ªfeira) recuperar ventos com força de furacão perto das costas das Ilhas Britânicas.
Anexos
Última edição:
Aristocrata
Super Célula
Bom dia.
O furacão IMELDA perdeu força, agora com 75 nós, depois de passar sobre a Bermuda.
Deverá perder aos poucos a intensidade, estando neste momento em transição extra-tropical, e deverá mudar o rumo para ONO, passando bem a norte dos Açores.
Os remanescentes do HUMBERTO, estão agora embebidos na circulação do Atlântico Norte, numa imensa massa de ar húmido tropical, com origem também na IMELDA.
A posição do que resta o HUMBERTO é difícil de ver na imagem.
O furacão IMELDA perdeu força, agora com 75 nós, depois de passar sobre a Bermuda.
Deverá perder aos poucos a intensidade, estando neste momento em transição extra-tropical, e deverá mudar o rumo para ONO, passando bem a norte dos Açores.
Os remanescentes do HUMBERTO, estão agora embebidos na circulação do Atlântico Norte, numa imensa massa de ar húmido tropical, com origem também na IMELDA.
A posição do que resta o HUMBERTO é difícil de ver na imagem.
Aristocrata
Super Célula
IMELDA já foi classificada como tempestade pós-tropical, tendo perdido as característica da manhã (ver post anterior):
Deixo aqui a última discussão do NHC sobre a mesma:
Deixo aqui a última discussão do NHC sobre a mesma: