Sonca has weakened to a tropical storm as it begin extra-tropical transition. It is now moving east northeastward over the North Pacific at a speed of nearly 70kph! Maximum sustained winds have decreased to 110kph gusting to 140kph.
Extra-tropical transition if expected to be completed in 24 hours or so. Sonca is still maintaining a warm-core low although latest VIS image shows the system has begun to interact with the strong upper-level westerlies. JTWC has given their final warning on Sonca although JMA is still putting regular warnings. Sonca is not forecast to become a threat to land anymore.
We'll have more update on Sonca tomorrow. Our complete Text Update for Typhoon Roke is coming up in half an hour!
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Issued (0830 UTC) 430pm PhT 092011
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