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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

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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.

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