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Ilsa Expected to Weaken Gradually While Tracking West-Southwestward

March 20th, 2009 Category: Tropical Cyclones

Tropical Cyclone 22S (Ilsa) - March 20th, 2009 © Univ. of Wisconsin

Tropical Cyclone 22S (Ilsa) - March 20th, 2009

TC 22S (Ilsa) - March 19th, 2009 © JTWC

TC 22S (Ilsa) - March 19th, 2009

Tropical Cyclone 22S (Ilsa), located approximately 530 nautical miles east-southeast of Cocos Island, has tracked westward at 10 knots over the past six hours.

The system has slightly intensified as convective bands that are wrapped around the low level circulation center have consolidated and deepened over the past 12 hours.

Enhanced poleward outflow is also evident on animated water vapor satellite imagery. Upper level analysis indicates the cyclone is tracking under an area of low vertical wind shear (VWS) along the northwestern periphery of a subtropical ridge extension.

The current position and intensity estimates are based on Dvorak satellite fixes from PGTW and APRF with T-number values at 5.5 and 5.0, respectively.

The cyclone is expected to track west-southwestward through the forecast period under the continued steering influence of the sub-tropical ridge.

TC 22S will gradually weaken as VWS will begin to increase and along-track sea surface temperatures drop to below 26 degrees Celsius. Maximum significant wave height at 200000z was 28 feet.

Tropical Cyclone 22s (Ilsa) Intensifies Rapidly

March 19th, 2009 Category: Tropical Cyclones

Tropical Cyclone 22s - March 18th, 2009

Tropical Cyclone 22s - March 18th, 2009

Track of TC 22s - March 19th, 2009 © Univ. of Wisconsin

Track of TC 22s - March 19th, 2009

Tropical Cyclone 22s (Ilsa), located approximately 720 nautical miles east-southeast of Cocos Island, has tracked southwestward at 12 knots over the past six hours. Maximum significant wave height is 18 feet.

It has passed between Jakarta, Indonesia, and Learmonth, on Australia’s North West Cape (the peninsula on the bottom right).

Animated water vapor imagery shows that the convection around the low level circulation center has further deepened and consolidated.

Upper level analysis indicates the system has tracked closer to the subtropical ridge axis and consequently, vertical wind shear (VWS) has weakened, contributing to the rapid intensification over the past 12 hours.

TC 22s - March 18th, 2009 © JTWC

TC 22s - March 18th, 2009

TC 22S will continue to track west-southwest along the northern periphery of the subtropical ridge and further intensify up to TAU 36. After that time, the system will slightly weaken with increased VWS as the ridge to the South builds.

Tropical Cyclone 22S Forms Between Indonesia and Australia

March 18th, 2009 Category: Tropical Cyclones

Tropical Cyclone 22s - March 18th, 2009

Tropical Cyclone 22s - March 18th, 2009

TC 22s - March 18th, 2009 © JTWC

TC 22s - March 17th, 2009

Tropical Cyclone 22s, located approximately 510 nautical miles north of Learmonth, Australia, has tracked west-southwestward at 15 knots over the past 6 hours. Maximum significant wave height  is 8 feet.

Animated multispectral imagery shows deep convection forming in the southwest and southeast quadrants (visible on the right side of the main image) and in the center of a well-defined circulation.

Animated water-vapor imagery shows the system developing a poleward outflow channel in the last few hours. An SSMI image shows well-defined deep convective bands wrapping around the South and into a well defined low level circulation center (LLCC).

Track of TC 22s - March 18th, 2009 © Univ. of Wisconsin

Track of TC 22s - March 18th, 2009

The system is in an area of moderate vertical wind shear and high sea surface temperatures. As the system tracks to the west-southwest it will move closer to the axis of the upper level anti-cyclone and will be in an area of more favorable vertical windshear and upper-level outflow.

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