By Eric Leister
In the western Pacific, Typhoon Rammasun is producing flooding rainfall and damaging winds along its track across the Philippines.
Rammasun strengthened to a typhoon on Monday under favorable environmental conditions of warm ocean water temperatures (30-31°C or 86-88°F) and generally low wind shear.
Rammasun continued to strengthen into Tuesday with peak winds around 115 mph when the cyclone made landfall in southeast Luzon.
Rammasun has the potential to intensify a bit more prior to landfall in the Sorsogon Province of the Philippines near the municipality of Barcelona Tuesday night local time.
Damaging winds and flooding rainfall are expected to continue across the north-central and northern Philippines as Rammasun moves across the island nation Tuesday night into Wednesday.
Impacts from Rammasun are already being felt across the western Philippines Tuesday night, local time, as outer bands of rain have already lashed Manila with 25-75 mm (1-3 inches) of rain.
Satellite image of Rammasun on Tuesday, courtesy of NOAA.
The heaviest rainfall so far has totaled 200-250 mm (8-10 inches) across parts of Samar Island, in northern Visayas. Some of the hardest hit areas include Catarman and Catbalogan.
The greatest impacts will continue across northern Visayas and southern Luzon, close to the storm track. Heavy rain will total 100-200 mm (4-8 inches) along and near the track of the storm, including Manila where flooding will be a serious concern. Wind gusts over 105 kph (65 mph) will be possible close to the storm track with isolated gusts up to 160 kph (100 mph) over the higher terrain.
When crossing the Philippines, Rammasun is expected to weaken due to the interaction with land and will likely be a tropical storm as it emerges into the South China Sea. It will then move across the South China Sea and will begin to make a gradual turn to the northwest, towards the southern coast of China late in the week.
Moving over another area of very warm waters and low to moderate shear will give Rammasun the opportunity to regain typhoon strength before reaching China.
Late in the week, Rammasun will then bring the threat for flooding rains and damaging winds to southern China with the greatest impacts likely in Hainan, southern Guangdong and southern Guangxi provinces.
Rammasun will then track into northern Vietnam where it will quickly weaken this weekend. Even though it will weaken after making landfall, widespread flooding is expected across southern China and northern Vietnam. Mudslides will also be a major concern as the storm moves into an area of more rugged terrain.
Continue to check back with the AccuWeather.com Hurricane Center for the latest on Rammasun and its effects in the Philippines and, eventually, into China and Vietnam.
Another tropical disturbance, currently to the southwest of Guam, could target the northern Philippines early next week.
Meteorologists Adam Douty and Erik Pindrock contributed to this story.