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Tropical Storm Sonca (19W) Undergoing Extratropical Transitioning

40.7N 145.8E

September 20th, 2011 Category: Tropical Storms

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

Enhanced image

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

Enhanced image

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.

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