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Posts tagged Freddy

Remnants of Tropical Cyclones 13S (Gael) and 14S (Freddy)

February 11th, 2009 Category: Tropical Cyclones

Tropical Cyclone 14S (Freddy) - February 10th, 2009

Tropical Cyclone 14S (Freddy) - February 10th, 2009

Remnants of Tropical Cyclone 13S (Gael)

Remnants of Tropical Cyclone 13S (Gael)

The strength and organization of TC 14S (Freddy) has decreased significantly, and it is no longer categorized as a cyclone. The image to the left shows the weakened system  west of Australia as of 0600Z yesterday.

The remnants of Freddy are also visible in the image to the right, valid at 1800Z. By comparing the earlier and later images, it is evident that Freddy has continued to weaken and become more disorganized.

Further west, TC13S (Gael) has completed extratropical transitioning. The righthand image shows the remnants of the cyclone moving away from Madagascar and La Reunion. These remnants appear even less organized than those of Freddy.

As of this time, there are no potential areas for cyclone formation in the Pacific nor the Indian Oceans.

Tropical Cyclone 13S (Gael) Expected to Transition into Cold Core System

February 10th, 2009 Category: Tropical Cyclones

Tropical Cyclone 13S (Gael) - February 9th, 2009 © JTWC

Tropical Cyclone 13S (Gael) - February 9th, 2009

Locations of TC 13S and TC 14S © JTWC

Locations of TC 13S and TC 14S

Tropical Cyclone 13S (Gael), located approximately 720 nautical miles south-southeast of La Reunion, has tracked southeastward at 20 knots over the past six hours.

The image of the globe shows its position, southeast of Madagascar. Tropical Cyclone 14S (Freddy) is also visible to the right, west of Australia.

Maximum significant wave height of Gael is 20 feet.

Animated water vapor imagery shows TC13S has increased its forward motion and convection around the low level circulation center has significantly decreased.

Environmental analysis indicates the system has rapidly tracked into an area of strong vertical wind shear and cooler sea surface temperatures.

The cyclone is expected to transition into a cold core system over the next 12 hours as it gets absorbed into the baroclinic zone.

The Joint Typhoon Warning Center will issue no further warnings on this system, though it will be closely monitored for signs of regeneration.

source JTWC

Tropical Cyclone 14S (Freddy) Weakens

February 10th, 2009 Category: Tropical Cyclones

Tropical Cyclone 14S (Freddy) - February 9th, 2009 © JTWC

Tropical Cyclone 14S (Freddy) - February 9th, 2009

Tropical Cyclone 14S (Freddy), located approximately 615 nautical miles west-northwest of Learmonth, Australia, has tracked southwestward at 11 knots over the past six hours.

Maximum significant wave height is 13 feet.

Animated water vapor imagery indicates the system has lost a significant amount of convection around the low level circulation center, which has become partially exposed.

Environmental analysis indicates that TC 14S remains in an area of moderate vertical wind shear and cooler sea surface temperatures.

These factors are contibuting to the gradual dissipation of the cyclone.

The Joint Typhoon Warning Center will issue no further warnings on this system, though it will be closely monitored for signs of regeneration.

source JTWC

Tropical Cyclone 14S (Freddy) Expected to Weaken

February 9th, 2009 Category: Tropical Cyclones

Tropical Cyclone 14S (Freddy) - February 9th, 2009

Tropical Cyclone 14S (Freddy) - February 9th, 2009

Tropical Cyclone 14S (Freddy), located approximately 525 nautical miles west-northwest of Learmonth, Australia, has tracked west-southwestward at 13 knots over the past 6 hours.

The system is tracking toward a weakness in the low to mid-level subtropical steering ridge induced by a midlatitude shortwave to the Southwest.

Generally west-southwestward motion will continue through the forecast period as the subtropical ridge remains the dominant steering influence.

Persistent easterly vertical wind shear and passage over cooler water are weakening the system.

Shear is expected to remain unfavorably high as along-track sea surface temperatures drop during the next 36 hours. Therefore, the maximum sustained wind speed is expected to fall below the 35 knot warning threshold by TAU 36.

Maximum significant wave height is 14 feet.

source JTWC

Tropical Cyclone 14s (Freddy) Continues to Intensify

February 8th, 2009 Category: Tropical Cyclones

Tropical Cyclone Freddy - February 8th, 2009Tropical Cyclone Freddy

Tropical Cyclone Freddy - February 8th, 2009

TC Freddy over the Earth Map

TC Freddy over the Earth Map

Tropical Cyclone 14s (Freddy), located approximately 455 nm northwest of Learmonth, Australia, has tracked westward at 10 knots over the past 6 hours. The system has intensified steadily over the past 12 hours aided by passage over warm water and strong westward diffluence.

This intensification has occurred despite persistent, moderate easterly vertical wind shear induced by the peripheral flow around an upper-level anticyclone located poleward of the cyclone. Tropical Cyclone 14s (Freddy) is tracking westward under the steering influence of subtropical ridging to the south.

The cyclone is expected to track west-southwestward through the forecast period toward a weakness in the subtropical ridge induced by a developing midlatitude trough.

TC Freddy - enhanced image

TC Freddy - enhanced image

Persistent vertical wind shear and passage over increasingly cooler water are expected to slowly weaken tc 14s after tau 24. Maximum significant wave height at 080600z is 18 feet.

source JTWC