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Tropical Cyclone 15P (Innis) Not Expected to Develop Further

February 18th, 2009 Category: Tropical Cyclones

Tropical Cyclone 15P - February 17th, 2009

Tropical Cyclone 15P - February 17th, 2009

TC 15P - enhanced image

TC 15P - enhanced image

Tropical Cyclone 15P (Innis), located approximately 395 nautical miles east of Brisbane, Australia, has tracked south-southwestward at 21 knots over the past 6 hours.

Maximum significant wave height is 11 feet.

Animated multispectral imagery indicates the low level circulation center (LLCC) has become sheared from the majority of deep convection by over 90 nautical miles.

Over thte past 12 hours TC15P has increased track speed and has moved into a region of unfavorable SST.

A mid to upper level trough digging to the northeast over eastern Australia and a subtropical ridge east of Innis has lead to increased vertical wind shear.

Additionally, increased gradient flow associated with these features has led to an acceleration of the track speed.

The mid to upper level low has impinged upper level outflow halting additional development.

Based on the increase in vertical wind shear, decreased SST, increased track speed, and the decrease in upper level outflow, further development of this system is not expected.

The system should experience additional weakening as it continues to move into even less favorable environments.

The Joint Typhoon Warning System will issue no further warnings on TC 15P, although the system will be closely monitored for signs of regeneration.

source JTWC

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