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Tropical Storm Ewiniar (19W) Becoming Extra-Tropical

45.0N 147.8E

September 30th, 2012 Category: Tropical Storms

Tropical Storm Ewiniar (19W) – September 29th, 2012

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Track of Tropical Storm Ewiniar (19W) - September 29th, 2012 © Univ. of Wisconsin

Track of TS 19W

Tropical Storm Ewiniar (19W) located approximately 475 nm east-northeast of Yokosuka, Japan, has tracked northeastward at 23 knots over the past six hours.

Animated enhanced infrared satellite imagery shows the low level circulation center (LLCC) has separated completely from the convection. Increasing vertical wind shear and unfavorable sea surface temperatures have led to a breakdown of the LLCC structure.
Continued acceleration to the northeast will further erode the system causing it to become extra-tropical (ET) within the next 12 hours. Maximum significant wave height is 15 feet.

Tropical Storm Ewiniar (19W) Tracking East-Northeastward – September 26th, 2012

24.0N 138.7E

September 26th, 2012 Category: Image of the day, Tropical Storms

Tropical Storm Ewiniar (19W) – September 26th, 2012

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Track of Tropical Storm Ewiniar (19W) - September 26th, 2012 © Univ. of Wisconsin

Track of TS 19W

Early on September 22, a tropical disturbance formed west of Guam, out of the Intertropical Convergence Zone, and the JMA upgraded it to a tropical depression on the next day.

On September 24, the JTWC upgraded the system to a tropical depression, as it became better organized, with an exposed low level circulation center. On September 24th, the JTWC further upgraded the system to a minimal tropical storm.

Tropical Storm Ewiniar (19W), located approximately 40 nm north of Iwo-to, Japan, has tracked east-northeastward at 8 knots over the past six hours. Maximum significant wave height is 20 feet.

Tropical Storm Sonca (19W) Undergoing Extratropical Transitioning

40.7N 145.8E

September 20th, 2011 Category: Tropical Storms

Tropical Storm Sonca (19W) - September 20th, 2011

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Track of TS 19W - September 20th, 2011 © Univ. of Wisconsin

Track of TS 19W

Tropical Storm Sonca (19W), located approximately 650 nm east of Misawa, Japan, has tracked east-northeastward at 32 knots over the past six hours.

Animated multispectral satellite imagery verifies the extra-tropical transition process (XTT) is well underway. The cloud shield is expanding as TS 19W merges with a frontal boundary over the northwestern Pacific.

TS 19W will complete XTT and transition into a high-gale to storm force mid-latitude low
within the next 12 hours. The system will be closely monitored for signs of regeneration. Maximum significant wave height is 15 feet.

Typhoon Sonca (19W) Tracking Northwestward

23.3N 138.0E

September 17th, 2011 Category: Tropical Cyclones

Typhoon Sonca (19W) - September 17th, 2011

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Track of TY 19W - September 17th, 2011 © Univ. of Wisconsin

Track of TY 19W

Typhoon Sonca (19W), located approximately 200 nm east-northeast of Iwo To, Japan, has tracked northwestward at 17 knots over the past six hours.

Maximum significant wave height at 171200z is 20 feet.

Tropical Storm Parma (19W) Hits Vietnam

October 13th, 2009 Category: Tropical Storms

Tropical Storm Parma (19W) - FAPAR - October 13th, 2009

Tropical Storm Parma (19W) - FAPAR - October 13th, 2009

Track of Parma - October 13th, 2009 © Univ. of Wisconsin

Track of Parma

Tropical Storm 19W Parma, located approximately 130 nm east-southeast of Hanoi, Vietnam, has tracked westward at 05 knots over the past six hours.

Animated multispectral satellite imagery shows a band of deep convection remains well defined on the southern periphery of Parma.

The combination of good upper level support with the system under the axis of an upper level subtropical ridge, providing good radial outflow, and interaction from land have helped to maintain the structure of this system without significant development over the past 06 hours.

Increased interaction with Vietnam will begin to hinder low level inflow, with a slow decrease in intensity over the next 24 hours. Landfall is expected around tau 24, with rapid weakening and complete dissipation by tau 36. Maximum significant wave height at 130600z is 11 feet.

Please click here for previous articles on tropical storm Parma.

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