Tuesday, September 20, 2011

Tropical Storm Sonca Update #8

Note: Update for Typhoon Roke will come out at 5pm today.

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!
Issued (0830 UTC) 430pm PhT 092011

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