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Posts tagged Iwo To

Super Typhoon Choi-Wan

18.6N 146.9E

September 16th, 2009 Category: Tropical Cyclones

Super Typhoon Choi-Wan - September 16th, 2009

Super Typhoon Choi-Wan - September 16th, 2009

Enhanced image - September 16th, 2009

Enhanced image

Track of Choi-Wan - September 16th, 2009 © Univ. of Wisconsin

Track of Choi-Wan

Super Typhoon 15W Choi-Wan, located approximately 250 nm north-northwest of Saipan, has tracked west-northwestward at 09 knots over the last 06 hours.

Recent animated multispectral satellite imagery shows an impressive system with deep convective banding wrapping into a center with a well defined eye. Intensity is based on estimates from PGTW, KNES and RJTD.

Choi-Wan has tracked along the southwestern periphery of a mid-level subtropical ridge (STR) that extends from northeast of Choi-Wan into the vicinity of Iwo To.

Track speeds have remained fairly consistent over the past 12 hours, ranging from 08 to 10 knots. A tropical upper tropospheric trough (TUTT) to the northeast has continued to provide good eastward outflow, in addition to an upper level point source anticyclone over Choi-Wan that has been providing strong radial outflow over the past 24 hours.

The multiple outflow mechanisms in concert with high values of ocean heat content (OHC) and sea surface temperatures (SST) have allowed for Choi-Wan to intensify further over the past 12 hours.

Tropical Storm Vamco (11W) Forms, Tropical Depression Maka (01C) Weakens – August 18th, 2009

16.6N 158.9E

August 18th, 2009 Category: Image of the day, Tropical Storms

Formation of Tropical Storm Vamco - August 16th, 2009

Formation of Tropical Storm Vamco - August 16th, 2009

Enhanced image of TS Vamco

Enhanced image of TS Vamco

Tracks of TS Vamco and TD Maka - August 18th, 2009 © Univ. of Wisconsin

Tracks of TS Vamco and TD Maka

Tropical Storm Vamco (11W) has formed in the Pacific and is located approximately 1045 nautical miles east-southeast of Iwo-To.

The system has tracked northwestward at 9 knots over the past six hours. Maximum significant wave height is 13 feet.

Tropical Storm Vamco began forming on August 14, as an area of convectional cloudiness associated with a monsoon. While the main image focuses on the formation of Vamco, the animated image shows both Vamco, left, and Tropical Depression Maka (01C), right.

Maka is currently located approximately 320 nautical miles southeast of Wake Island, and has tracked westward at 5 knots over the past six hours. Maximum significant wave height is 12 feet.

Recent animated multispectral imagery of 01C shows an exposed low level circulation center (LLCC) that has become increasingly elongated and less organized in the last 6 hours. An ASCAT pass shows a closed circulation with 5 knot winds on the south side of the LLCC and 15-20 knot winds on its north side.

Environmental analysis shows Maka is continuing to move into higher levels of vertical wind shear with sea surface temperatures remaining favorable. In the upper-level, a tropical upper tropospheric trough (TUTT) to the north places the system in an area of strong upper-level confluence that has suppressed outflow.

Kujira (01W) Downgraded to Tropical Storm

May 7th, 2009 Category: Tropical Cyclones

Track of Tropical Storm 01W (Kujira) - May 6th, 2009 © Univ. of Wisconsin

Track of Tropical Storm 01W (Kujira) - May 6th, 2009

TS 01W © JTWC

TS 01W

Kujira (01W) has been downgraded from typhoon to tropical storm status.

The system, which is located approximately 150 nm east-northeast of Iwo-To, Japan, has tracked north-northeastward at 19 knots over the past six hours. Maximum significant wave height is 21 feet.

TS 01W has rapidly lost its vertical organization and is beginning to take on frontal characteristics, indicative of an extratropical system.

With a complete shearing of convection from the low level circulation center (LLCC) and induction of dry mid-latitude air into the LLCC, Kujira is expected to fully transition to an extratropical system within the next 12 hours.

Typhoon 01W (Kujira) Located South-Southwest of Japan

23.2N 142.7E

May 6th, 2009 Category: Tropical Cyclones

Track of Typhoon 01W (Kujira) - May 6th, 2009 © Univ. of Wisconsin

Track of Typhoon 01W (Kujira) - May 6th, 2009

Typhoon 01W © JTWC

Typhoon 01W

Typhoon 01W (Kujira), located approximately 200 nautical miles south-southwest of Iwo-To, Japan has tracked northeastward at 18 knots over the past six hours. Maximum significant wave height is 22 feet.

Animated water vapor imagery indicates the system continues to maintain good poleward outflow even as it gets eroded on the southwestern quadrant by strong vertical wind shear. This has helped the system maintain its current intensity.

Typhoon Kujira is tracking along the northwest periphery of the subtropical ridge to the southeast. This motion is accelerated by strong winds associated with a mid-latitude trough digging into the East China Sea.

TY 01W is expected to continue its rapid ascent into northern and cooler latitudes, weaken, and become extratropical by TAU 36.

27W (Dolphin) Weakens to Tropical Depression Status

December 19th, 2008 Category: Tropical Cyclones

Tropical Depression 27W (Dolphin) - December 18th, 2008 © JTWC

Tropical Depression 27W (Dolphin) - December 18th, 2008 © JTWC

Dolphin has weakened to a Tropical Depression.

It is located approximately 40 nautical miles east of Iwo To (Iwo Jima), and has tracked east-northeastward at 25 knots over the past six hours.

The low level circulation center has been absorbed into the mid-latitude flow and convection has dissipated.

Maximum significant wave height is 10 feet.

The Joint Typhoon Warning Center will not issue further warnings, although it will closely monitor the system for signs of regeneration.

source JTWC