Meteorological History
On December 2, the Japan Meteorological Agency (JMA) began to issue gale warnings on a new-born extratropical cyclone around the Ogasawara Islands, and JMA started to issue storm warnings when the system accelerated eastward on the next day. The storm reached storm-force and attained its extratropical peak intensity with 10-minute maximum sustained winds of 60 knots (110 km/h, 70 mph) on December 4, when it was located far east of Japan; however, the low became developed late on the same day.
The storm north of Wake Island started to track east-southeastward on December 5, as well as it tracked southeastward then southward on December 6. At noon, it became a developing low again and reached its extratropical peak intensity for the second time, before it moved into the tropics. On December 7, the storm started to track southwestward and weakened into a gale-force system; eventually, the system transformed into a tropical depression southeast of Wake Island early on December 8.
However early the next day, the JMA downgraded the depression to a low pressure area as the depression's low level circulation center was partially exposed and was in an area of moderate to high vertical wind shear. However the JMA re-upgraded the disturbance to a weak tropical depression 24 hours later. At 0600 UTC that morning, the Joint Typhoon Warning Center (JTWC), released a significant tropical weather advisory and rated the chances of the disturbance becoming a significant tropical cyclone within 24 hours as poor, due to a quikscat pass had shown that the low level circulation center had broken down into a wave. However after the advisory was released the low level circulation center started to rapidly consolidate, and thus the JTWC initiated issuing warnings at 1200 UTC, December 10, and designated it as Tropical Depression 27W whilst it was about 640 km (400 mi) to the east of Guam and moving towards the west. Early the next day the depression's centre passed about 100 km (62 mi) to the south of Guam and made its closest approach.
Read more about this topic: Typhoon Dolphin (2008)
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