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Tropical Storm Pakhar (02W) by Vietnam – April 1st, 2012

11.7N 108.2E

April 1st, 2012 Category: Image of the day, Tropical Storms

Tropical Storm Pakhar (02W) - March 30th, 2012

Enhanced image

Track of Tropical Storm Pakhar (02W) - March 31st, 2012 © Univ. of Wisconsin

Track of TS 02W

On March 17, an area of disturbed weather associated with a cold front formed about 300 km (190 mi), to the northwest of Palau Island. At that time, the low pressure area was located in an area of moderate vertical wind shear, with unfavorable water temperature.

Over the next couple of days, it slowly moved towards the Samar area, and crossed the Visayas region. On March 20, the low pressure area remained almost stationary, about 140 km (85 mi) to the northwest of Puerto Princesa, Palawan. The cause of the low’s stalling was due to a high pressure system, that was building up to the northeast of the system, extending into Vietnam. At the same time, the JMA upgraded the storm to a disturbance.

The system remained stationary for more four days, before the JMA upgraded it to a tropical depression. However, on March 25, the JMA downgraded the tropical depression to a disturbance, as the storm’s outer rainbands began to collapse, and its low level circulation center began to be fully exposed.

Early on March 26, the JMA re-upgraded the disturbance to a tropical depression, as the storm began to reorganize. By this time, the depression became well organized, due to low vertical wind shear associated with favorable water temperatures.

During the afternoon of March 27, the tropical depression started to move southwest slowly, due to the weakening of the high pressure system in Vietnam. At the same time, the building of another Subtropical Ridge, located to the northeast of the system, began turning the tropical depression westwards. Simultaneously, the cold front associated with strong northeast monsoon allowed the depression to become more well organized. In addition, water temperatures still under favorable conditions allowed the storm to continue strengthening.

On March 28, JTWC issued a TCFA to the disturbance as its LLCC starts to consolidate more. Early on the next day, the JMA upgraded the tropical depression to a tropical storm and named it Pakhar, because the storm’s convection completely wrapped around the center of circulation. During the next several hours, Pakhar curved towards the northeast, as the storm continued to intensify. At the same time, the JTWC upgraded the disturbance into a tropical depression, and upgraded it to a tropical storm, just a few hours later.

On March 29, Pahkar continued to organize, as the storm slowed down. Early on March 30, the JTWC upgraded Pakhar to a category 1 typhoon. Because of land interaction and colder sea surface temperature, the JTWC downgraded Pakhar to a tropical storm early on March 31.

Pahkar did not make landfall in the Philippines. However, torrential rains and strong winds resulted in heavy traffic, in Metro Manila and nearby provinces. Flooding also occured in different parts of central and southern Luzon, and the northern Visayas region. Landslides were also reported and caused flooding in some provinces. The NDRRMC reported that 2 people drowned, and other 2 people are reported as missing. In Bacolod City at noontime, on March 29 (Philippine Time), 5 cars were destroyed, couple of trees lining up along the streets laid to waste, and business establishments were damaged, near the Universtity of St. La Salle. During the event, 23 people were injured, including one baby girl. Pahkar also spawned a tornado that lasted for 10 minutes.

Philippines after Typhoons Chan Hom and Kujira

14.6N 120.9E

May 13th, 2009 Category: Snapshots

Philippines - May 12th, 2009

Philippines - May 12th, 2009

Within a week’s time, the northern Philippines were hit by two tropical cyclones, Kujira (01W) and Chan Hom (02W), that left behind more than 42 inches of rainfall to various areas, states NASA.

The image focuses on part of the island of Luzon. Manila, the capital of the Philippines, is located on Manila Bay (bottom), near the green Laguna de Bay Lake (bottom right).

The rivers in the image are brown from sediments dredged up by the heavy rainfall. These sediments can be seen flowing from rivermouths along the coastline, particularly in Manila Bay. To the north, the waters of the Gulf of Lingayen (top left) are clearer.

The storms displaced more than 400,000 people, the vast majority of whom have yet to return home, the National Disaster Coordinating Council (NDCC) reported.

The heavy rains and landslides from the latest tropical cyclone, Chan Hom, killed 43 people after making landfall on May 7th.

It also displaced more than 161,020 people in 51 towns, six cities and 11 provinces in Luzon, the country’s largest island.

Typhoon Kujira, which made landfall on May 2nd, caused 33 deaths and displaced 246,170, according to the NDCC.

The country’s Defence Secretary stated that many casualities occurred, despite early warnings about the typhoons, because many people in coastal areas did not have anywhere to go and tried simply to reinforce their wooden homes.

The state weather bureau said the storms, as well as a tropical depression that proceeded them, ushered in the early arrival of the annual typhoon season, which kills tens of thousands and causes widespread damage. About 20 typhoons strike the Philippines every year.

Taiwan and Remnants of Chan Hom (02W)

May 12th, 2009 Category: Tropical Cyclones

Remnants of 02W near Taiwan - May 12th, 2009

Remnants of 02W near Taiwan - May 12th, 2009

Detail of Taiwan

Detail of Taiwan

The island of Taiwan, off the coast of mainland China (left), is 394 kilometers (245 miles) long and 144 kilometers (89 miles) wide and consists of steep mountains covered by tropical and subtropical vegetation.

It is bound to the south by the South China Sea and the Luzon Strait, to the west by the Taiwan Strait, to the north by the East China Sea, and to the east by the Pacific Ocean.

East of Taiwan, in the Pacific, the spiralled shape of the remnants of Typhoon 02W (Chan Hom)  are visible. After being downgraded to a Tropical Depression yesterday, Chan Hom has since dissipated.

Chan-Hom Weakens to Tropical Depression after Pummelling Philippines

May 11th, 2009 Category: Tropical Cyclones

Tropical Depression 02W (Chan-Hom) - May 10th, 2009

Tropical Depression 02W (Chan-Hom) - May 10th, 2009

Track of TD 02W - May 11th, 2009

Track of TD 02W

Chan-Hom (02W), which has weakened to a tropical depression, has tracked northwestward at 4 knots over the past six hours.

It now located approximately 265 nautical miles south of Okinawa, Japan, after ravaging the northern Philippines last week.

The National Disaster Coordinating Council (NDCC) said 13 people were missing and more than 160,000 were adversely affected when Chan-Hom pummelled more than 30 northern provinces beginning on May 7th.

The death toll from the storm has reached 43 people; the majority of which drowned in swollen rivers or were buried in landslides, reports the Asia-Pacific News.

Most of the casualties occured in Pangasinan and Ifugao, the provinces hit hardest by the storm. At least 21 people were killed in Pangasinan, while 16 fatalities were reported in Ifugao.

The agency said damage to agriculture and infrastructure was estimated at 781.70 million pesos (16.28 million dollars) and could go up as rescuers reached areas isolated by the typhoon.

The NDCC added that power has been restored in most of the areas hit by the typhoon, although some rivers remained swollen and roads impassable.

Since moving past the Philippines, animated multispectral imagery indicates the fully exposed low level circulation center (LLCC) has significantly elongated. Remnant convection to the northeast has been further reduced and sheared, and is now over 90 nm detached to the east.

TD 02W enhanced image - May 10th, 2009

TD 02W enhanced image - May 10th, 2009

TD 02W multispectral imagery - May 11th, 2009 © JTWC

multispectral imagery - May 11th, 2009

Environmental analysis indicates TD02W is under moderate to strong vertical wind shear (VWS) and is tracking over cooling sea surface temperatures (SST) below 25 celsius. Maximum significant wave height 10 feet.

Chan-hom is expected to move very slowly north along the western edge of a low level ridge (or become quasi-stationary) then dissipate by TAU 12.

Chan-Hom (02W) Hits Northern Philippines

May 8th, 2009 Category: Tropical Cyclones

Track of Tropical Storm 02W (Chan-Hom) - May 8th, 2009

Track of Tropical Storm 02W (Chan-Hom) - May 8th, 2009

TS 02W © JTWC

TS 02W

Chan-Hom (02W) has been downgraded from a typhoon to a tropical storm. It is now located approximately 275 nautical miles northeast of Manila, Philippines, after tracking east-northeastward at 14 knots over the past six hours. Maximum significant wave height is 10 feet.

Before losing strength, Chan-Hom pummelled the northern Philippines, hitting the northern province of Pangasinan late Thursday with maximum winds of 150 kilometres per hour and gusts of up to 185 kph.

Aat least five people were killed in landslides, by drowning and in other accidents, reported disaster relief officials, and others were injured or have been reported missing. The typhoon also caused blackouts and damage to buildings.

Chan-Hom struck the Philippines a few days after typhoon Kujira battered eastern provinces, killing 27 people and damaging more than 9 million dollars worth of crops, livestock and fisheries.

According to the Weather Bureau, Chan-Hom weakened as it made landfall and continued to move north-east at 15 kph. Its maximum winds dropped to 95 kph and gusts of up to 120 kph.

Recent animated multispectral imagery shows a poorly organized low level circulation center (LLCC) with deep convection sheared towards the East with a strong poleward outflow channel. An AMSU-B image shows a well defined LLCC with deep convective banding far to the East of the center.

Upper level analysis indicates the system is in an area of moderate to high vertical wind shear and to the north of the upper-level subtropical ridge axis. Chan-Hom is currently under the steering influence of a low- to mid-level near-equatorial ridge to the Southeast.

The system is expected to come under the influence of a low-level midlatitude ridge to the northeast after TAU 24. The system will then start to track to the north under the new influence and is expected to be out of the Philippines by Sunday.

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