Tag Archives: Masbate

Tropical Storm Choi-wan Brings Rain to Philippines

Tropical Storm Choi-wan brought rain to the central Philippines on Tuesday. At 11:00 p.m. EDT on Tuesday the center of Tropical Storm Choi-wan was located at latitude 13.1°N and longitude 121.9°E which put it about 155 miles (250 km) southeast of Manila, Philippines. Choi-wan was moving toward the west-northwest at 17 m.p.h. (28 km/h). The maximum sustained wind speed was 40 m.p.h. (65 km/h) and there were wind gusts to 50 m.p.h. (80 km/h). The minimum surface pressure was 1002 mb.

The center of Tropical Storm Choi-wan made an initial landfall on the east coast of Samar and then it moved west-northwest across the central Philippines. Choi-wan moved across the Sibuyan Sea and it was centered southeast of Manila on Tuesday night. The circulation around Tropical Storm Choi-wan weakened when the center passed over Samar, but it was still producing a small area of tropical storm force winds. Winds to tropical storm force extended out 35 miles (55 km) from the center of Choi-wan.

Tropical Storm Choi-wan dropped locally heavy rain over parts of Samar, Masbate, Panay and Mindoro on Tuesday. An upper level ridge centered over southern China was producing northeasterly winds which were blowing toward the top of Choi-wan. Those winds were producing moderate vertical wind shear and they causing the heavier rain to fall in bands in the southern half of Tropical Storm Choi-wan. Bands in the northern half of the tropical storm consisted primarily of showers and lower clouds.

Tropical Storm Choi-wan will move around the western end of a subtropical high pressure system over the Western North Pacific Ocean. The high pressure system will steer Choi-wan toward the north-northwest during the next several days. On its anticipated track the center of Tropical Storm Choi-wan could pass just south of Manila in 12 hours. Choi-wan could drop locally heavy rain on Mindoro and western Luzon. Heavy rain could cause flash floods in some locations.

Tropical Storm Choi-wan will move through an environment that is mostly unfavorable for intensification. Choi-wan will move over water where the Sea Surface Temperatures are near 30°C. However, the upper level ridge center over southern China will continue to cause moderate vertical wind shear. The wind shear will limit the potential for intensification. The eastern side of the circulation around Tropical Storm Choi-wan will be over Luzon during the next 24 hours, which will also be unfavorable for intensification.

Strengthening Typhoon Phanfone Makes Landfall in Central Philippines

A strengthening Typhoon Phanfone made landfall in the central Philippines on Tuesday morning.  At 10:00 a.m. EST on Tuesday the center of Typhoon Phanfone was located at latitude 11.6°N and longitude 124.1°E which put it about 30 miles (50 km) southeast of Placer, Philippines.  Phanfone was moving toward the west-northwest at 19 m.p.h. (31 km/h).  The maximum sustained wind speed was 105 m.p.h. (170 km/h) and there were wind gusts to 125 m.p.h. (200 km/h).  The minimum surface pressure was 966 mb.

Typhoon Phanfone strengthened quickly as it made landfall in the central Philippines.  A small circular eye became more distinct on  satellite imagery.  The eye was surrounded by a ring of strong thunderstorms and the strongest winds were occurring in that ring of storms.  Winds to typhoon force extended out 30 miles (50 km) from the center of circulation.  Winds to tropical storm force extended out 120 miles (195 km) from the center.  The Hurricane intensity Index (HII) for Typhoon Phanfone was 17.8.  The Hurricane Size Index (HSI) was 10.8 and the Hurricane Wind intensity Size Index (HWISI) was 28.6.

The center of Typhoon Phanfone made landfall near Guiuan on Samar.  The center of Phanfone passed near Tacloban on Leyte before it moved over the Visayan Sea.  Typhoon Phanfone brought strong winds and heavy rain to Samar and Leyte.  The winds were strong enough to cause serious damage and regional power outages.  The heavy rain could cause flash floods in some locations.

Typhoon Phanfone moved through a favorable environment that allowed to strengthen.  Phanfone moved over water where the Sea Surface Temperature was near 29°C.  It moved through a region where the upper level winds were weak and there was little vertical wind shear.  The core of Phanfone moved quickly over narrow portions of Samar and Leyte and the core remained intact.  Typhoon Phanfone could strengthen while the enter moves across the Visayan Sea and it could intensify into the equivalent of a major hurricane.

Typhoon Phanfone will move south of a subtropical ridge over the Western North Pacific Ocean during the next several days.  The ridge will steer Phanfone toward the west-northwest.  On its anticipated track the center of Typhoon Phanfone will pass near Masbate and the northern end of Panay Island.  Phanfone could be near Mindoro in about 12 hours.  Typhoon Phanfone will bring strong winds and heavy rain to Masbate, the northern end of Panay Island, the northern end of Negros and Mindoro.  Conditions will improve gradually when Phanfone moves away from Samar and Leyte.

Tropical Storm Kai-tak Drops Heavy Rain on Philippines

Tropical Storm Kai-tak dropped heavy rain on places in the Philippines during the past several days.  At 4:00 p.m. EST on Friday the center of Tropical Storm Kai-tak was located at latitude 12.1°N and longitude 126.8°E which put it about 150 miles (240 km) east-northeast of Tacloban, Philippines.  Kai-tak was moving toward the northwest at 10 m.p.h. (16 km/h).  The maximum sustained wind speed was 50 m.p.h. (80 km/h) and there were wind gusts to 65 m.p.h. (105 km/h).  The minimum surface pressure was 996 mb.

The distribution of thunderstorms around Tropical Storm Kai-Tak remains asymmetrical.  Kai-tak is south of an upper level ridge which is producing easterly winds which are blowing toward the top of the tropical storm.  Those winds are causing moderate vertical wind shear and most of the thunderstorms are developing in the western half of the circulation.  The magnitude of the vertical wind shear fluctuates as the speed of the upper level winds increases or decreases.  Changes in the magnitude of the wind shear contributes to fluctuations in the intensity of the thunderstorms.  When the shear is stronger, most of the storms develop in the outer portion of the circulation of Kai-tak.  When the upper level winds slow, thunderstorms are able to develop closer to the western core of the tropical storm.  Daytime warming of the surface of some of the islands in the Philippines may increase the local instability, which also contributes to the formation of storms over those islands.

Tropical Storm Kai-tak moved very little during the past two days.  As a result, heavy rain fell repeatedly over portions of Samar, Leyte, Bohol, Cebu, Negros, Panay, Masbate and southeastern Luzon.  The heavy rain is creating the potential for floods and mudslides in those areas.

Tropical Storm Kaitak will move through an environment that is only marginally favorable for development.  Kai-tak will move over water where the Sea Surface Temperature is near 29°C.  However, the upper level ridge will continue to cause moderate vertical wind shear.  Tropical Storm Kai-tak could intensify a little during the next 24 hours, but the wind shear will limit the potential for strengthening.  Tropical Storm Kai-tak is likely to weaken when the center of circulation passes over islands in the Philippines.

The subtropical ridge north of Kai-tak is steering the tropical storm toward the northwest.  The ridge is forecast to strengthen during the weekend and it is likely to steer Tropical Storm Kai-tak more toward the west during the next 24 to 36 hours.  On its anticipated track the center of Kai-tak could reach Samar in the next 12 to 18 hours.  The center could then move near Masbate and Panay.

Tropical Storm Kai-tak will continue to drop locally heavy rain on places in Samar, Leyte, Bohol, Cebu, Panay, Negros, Masbate and southern Luzon for several more days.  The heaviest rain will fall in locations where the wind pushes air up the slopes of mountains.  The potential for floods and mudslides will increase as more rain falls.