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Tropical Cyclone 21P (Ken) Remains Almost Stationary

March 18th, 2009 Category: Tropical Cyclones

Tropical Cyclone 21P (Ken) - March 18th, 2009 © Univ. of Wisconsin

Tropical Cyclone 21P (Ken) - March 18th, 2009

TC 21P (Ken) - March 17th, 2009 © JTWC

TC 21P (Ken) - March 17th, 2009

Tropical Cyclone 21p (Ken), located approximately 190 nautical miles west-southwest of Rarotonga, in the Cook Islands, has remained quasi-stationary over the past 6 hours. Maximum significant wave height is 10 feet.

Recent animated multispectral satellite imagery shows a partially exposed low level circulation center (LLCC) with open cell CU to the West of the LLCC.

Animated infrared imagery shows a cell of deep convection to the East of the LLCC with fragmented deep convective bands wrapping into the east side.

A QuikSCAT pass reflects a well formed LLCC with 35 knot unflagged winds circling the center.

Currently the LLCC is located near the 26C sea surface isotherm and is moving into unfavorable sea surface temperatures. Outflow has been hampered with the cross equatorial outflow channel having closed off.

TC 21P is currently beeing steered by the low-level ridge to the East but an approaching mid-latitude trough will become the dominant steering influence in the next 12 hours.

Ken will accelerate to the Southeast where it will begin extra-tropical (ET) transitioning. It is expected to maintain intensity as the approaching mid-latitude trough will enchance poleward outflow as the system moves over cooler water. The system will complete ET transitioning by TAU 36.

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