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Typhoon Sanvu (03W) South of Japan – May 26th, 2012

28.0N 137.3E

May 26th, 2012 Category: Tropical Cyclones

Typhoon Sanvu (03W) - May 26th, 2012

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Track of Typhoon Sanvu (03W) - May 26th, 2012 © Univ. of Wisconsin

Track of TY 03W

Late on May 23, the JTWC upgraded Sanvu to a category 1 typhoon, for the system became compact and more organized as an eye was forming. After being upgraded to a severe tropical storm by the JMA late on May 24, Sanvu’s eye directly passed over Iō-tō late on May 25.

On May 25, 2012 at 1500 UTC (11 a.m. EDT/U.S.), Typhoon Sanvu had maximum sustained winds near 60 knots (69 mph/111 kph), slightly weaker than it was on May 24. Typhoon-force winds cover a compact area, extending 25 miles (40 km) from the center, while tropical storm-force winds extend as far as 150 miles (241.4 km) from the center, making the storm over 300 miles (~483 km) in diameter.

Sanvu’s center was located near 23.9 North and 140.3 East, only 100 nautical miles (115 miles/185 km) southwest of Iwo To, Japan and moving to the north-northeast at 7 knots (8 mph/13 kph). Sanvu continues to churn up rough seas, and the Joint Typhoon Warning Center reported that wave heights in the region are as high as 31 feet (9.4 meters).

Tropical Storm Sanvu (03W) Expected to Become Typhoon by Thursday

16.1N 140.8E

May 23rd, 2012 Category: Tropical Storms

Tropical Storm Sanvu (03W) - May 23rd, 2012

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Track of Tropical Storm Sanvu (03W) - May 23rd, 2012 © Univ. of Wisconsin

Track of TS 03W

On May 17, a disturbance associated with a low presure area, and the ITCZ formed southeast of Guam. Late on May 20, the JTWC issued a TCFA on the system because of improving equator-ward outflow. Early on May 21, the JMA upgraded the low-pressure area to a tropical depression, and the JTWC also upgraded the system to a tropical depression later.

Early on May 22, the JMA upgraded the system to a tropical storm and named it Sanvu, as the tropical depression intensified even as it moved northwestward away from coastal waters of the Marianas.

As of 5pm yesterday, Tropical Storm Sanvu was still churning northwestward at 12 miles per hour with maximum sustained winds near 85 km/hr (45 knots) with higher gusts. At that time, Sanvu’s center was 130 miles west-northwest of Guam, 155 miles west of Rota, 190 miles west-southwest of Tinian, and 200 miles southwest of Saipan. Tropical Storm Force Winds (62-117 km/hr) extend outward up to 185 kilometers (100 nautical miles) from the center. Sanvu is an average-sized tropical cyclone with a diameter of 480 kilometers (260 nautical miles).

A tropical storm warning at that time was still in effect for Guam and Rota, while a tropical storm watch was also still in effect for Tinian and Saipan. The storm brought numerous showers and isolated thunderstorms in the morning until last night, Tuesday. NWS said that scattered showers and isolated thunderstorms will linger into Wednesday night in the region.

Sanvu is expected to continue moving NW for the next 12 to 24 hours, before turning more northerly on Friday and recurving NNE to NE-ward on Saturday. On the forecast track, the core of Sanvu will pass very close to Iwo To by early Saturday morning. The system is forecast to continue intensifying and will likely become a Typhoon on Thursday.

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