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Typhoon Ma-on Over Japan and Near South Korea – July 29th, 2011

34.2N 131.0E

July 29th, 2011 Category: Image of the day, Tropical Cyclones

Typhoon Ma-on (8W) - July 19th, 2011

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Typhoon Ma-on (international designation: 1106, JTWC designation: 08W, PAGASA Name: Ineng) was a powerful typhoon that affected southern Japan. It was the sixth named storm and second typhoon of the 2011 Pacific typhoon season.

The origins of the typhoon were from an area of convection that persisted near Wake Island on July 9. The system slowly organized as it developed a low-level circulation. With low wind shear and generally favorable environmental conditions, tropical cyclone forecast models anticipated the development of a tropical cyclone from the system. Early on July 11, the Joint Typhoon Warning Center (JTWC) issued a tropical cyclone formation alert, and a few hours later the Japan Meteorological Agency (JMA) reported the formation of a tropical depression about halfway between Wake Island and the Northern Marianas Islands. The JTWC followed suit by initiating advisories on Tropical Depression 08W.

Upon its formation, the depression tracked westward due to a ridge to its north. The circulation was initially broad and ill-defined, while its convection was disorganized due to dry air. It was able to intensify due to generally favorable conditions, and the JMA upgraded the depression to Tropical Storm Ma-on at 0600 UTC on July 12. Gradually the thunderstorms became concentrated around the center, despite restricted outflow to the north and west. Ma-on intensified at a slower than climatological rate, although an eye feature became evident by early on July 13. At 0000 UTC that day, the JMA upgraded Ma-on to a severe tropical storm, and 18 hours later they upgraded it to a typhoon. By that time, it was located about 970 km (575 mi) southeast of Iwo Jima. A ragged eye became apparent on satellite imagery, and after developing an anticyclone aloft, its outflow became much better defined.

By July 15, Typhoon Ma-on had a well-defined eye with the strongest convection in its southern periphery. It continued intensifying, and the JTWC estimated 1-minute sustained winds of 135 mph (220 km/h). Late on July 15, Ma-on weakened slightly due to stronger wind shear, which caused its eyewall to break apart in the northwest quadrant. It re-intensified the next day after an eyewall replacement cycle commenced. At 0600 UTC on July 16, the JMA estimated peak 10-minute sustained winds of 175 km/h (110 mph) while the typhoon was located about 1185 km (735 mi) southeast of Okinawa. Around that time, Ma-on began a motion to the northwest due to a weakening of the subtropical ridge, and it briefly entered the area warned by the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA); the agency gave it the local name Ineng.
Typhoon Ma-on on July 15

Late on July 17, Ma-on underwent another eyewall replacement cycle and weakened, despite developing improved outflow and convection in the northern quadrant. The typhoon’s large size prevented re-intensification – gale force winds extended 370 km (200 mi) east of the center. In addition, the intrusion of dry air diminished thunderstorms in the western periphery. By July 18, Ma-on reached the western extent of the ridge and began a motion to the north toward Japan. The next day, it turned to the northeast as it paralleled the Japan coastline just offshore. According to the JTWC, Ma-on briefly weakened to a tropical storm before re-intensifying into a typhoon, making landfall along the Kii Peninsula in Honshu. The JMA maintained the system as a typhoon until 0000 UTC on July 20, when Ma-on moved ashore.  By the time it moved across Japan, the storm was moving due eastward, and after emerging from the country it turned to the southeast. Increased wind shear displaced the convection to the east, although slight re-intensification was expected. However, the JTWC downgraded Ma-on to a tropical depression on July 21 after the storm lost much of its convection. The circulation became ill-defined, and the JTWC discontinued advisories on July 22, noting the system was in the process of dissipation. However, the JMA maintained Ma-on as a severe tropical storm until July 23, by which time the storm had turned to the northeast. The agency discontinued advisories on July 24.

Typhoon Kompasu (08W) and Tropical Storms Namtheun and Lionrock

29.0N 129.6E

August 31st, 2010 Category: Tropical Cyclones, Tropical Storms

Typhoon Kompasu (08W) - August 30th, 2010

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Track of TY 08W - August 30th, 2010 © Univ. of Wisconsin

Track of TY 08W

Upon opening the full image, Typhoon Kompasu (08W) can be seen between Japan (north) and the Philippines (south). In the animated image, Kompasu is the system to the right, whose track is marked; also visible to the left in the full version are Tropical Storm Namtheun (09W) and Tropical Storm Lionrock (07W).

Typhoon Kompasu began as an area of low pressure that formed on August 27th, about 305 km (200 mi) to the east of the island of Yap. At that time, the system was disorganized due to high vertical wind shear.

The next day, the system started to move northwest and crossed the island of Guam. That evening, the system was located about 370 km (250 mi) northwest of Guam, in an area of low vertical windshear and a favorable environment. A Tropical Upper Tropospheric Trough (TUTT) was located to the east of the system. At that time, the Japanese Meteorological Agency upgraded the system into a tropical depression.

Around midday on August 29th, the Joint Typhoon Warning Centre (JTWC) issued a Tropical Cyclone Formation Alert (TCFA) on the system as the Low Level Circulation Center (LLCC) became more organized. On the morning of that same day, the JTWC announced that the system had quickly developed into a tropical storm and assigned the designation “08W”.

Intensification continued, and by midday on August 30th, the JMA reported that the depression had intensified into a tropical storm and assigned its international designation “Kompasu”. In addition, PAGASA also announced that the low pressure to the northeast of Batanes had formed, and assigned its local name: “Glenda”. Six hours later, the JMA reported that Kompasu had intensified rapidly into a severe tropical storm. At the same time, the JTWC also upgraded Kompasu to a category 1 typhoon.

Tropical Storm Goni/Jolina Drenches Taishan, China

20.6N 111.4E

August 7th, 2009 Category: Tropical Storms

Remnants of Tropical Storm Goni - August 7th, 2009

Remnants of Tropical Storm Goni - August 7th, 2009

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Track of TS Goni

Track of TS Goni

Tropical Storm Goni (08W), also known as Jolina, has brought torrential rain to southern China after making landfall early Wednesday morning.

Downpours drenched Taishan in Guangdong Province for 15 hours. Average rainfall in the area has reached 128 millimeters, causing direct economic losses in Taishan of up to 120-million yuan.

As it weakens, Goni is moving westward and slowing. The storm is expected to bring downpours to western part of Guangdong on Thursday and Friday.

Earlier, the Maritime Affairs authority issued an emergency warning to 20-thousand fishing vessels in the South China Sea, ordering them back to port.

Late on July 25, the JTWC reported that an area of convection had formed in a monsoon trough about 815 km (515 mi) to the northeast of Guam. Over the next few days the disturbance gradually developed before being declared as dissipated early on July 28, as the low level circulation center was not well defined and higher vertical wind shear affecting the system.

However the disturbance regenerated early on July 30, and a Tropical Cyclone Formation Alert was issued early on August 1st, as deep convection had increased and was starting to consolidate around a circulation center. However later that morning Goni made a landfall near to Casiguran, in the Philippine province of Aurora, before emerging out into the South China sea later that day. At 1700 UTC of August 4, Goni made its second landfall over Macau.

In the Philippines Goni (Jolina) death toll is 8 with 5 more missing. Goni (Jolina) affected 38,589 families or 160,038 people in 119 villages in 25 towns and five cities in Ilocos Norte, Cagayan, Nueva Ecija, Rizal, Mindoro Occidental, Palawan, Iloilo, Negros Occidental, Lanao del Sur, and Sultan Kudarat town in Maguindanao.

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