The fast-moving typhoon blew westward, barreling across the mountainous regions of Luzon Island. It weakened slightly as it reached the shore of La Union province around 4 p.m. (0800 GMT), about seven hours after it made landfall.
A landslide in northern Bontoc province smashed into a passenger van on a mountain highway, killing one passenger and injuring another, Civil Defense chief Benito Ramos said.
The typhoon took a similar path across areas on Luzon saturated by Typhoon Nesat, which trapped thousands on rooftops and sent huge waves that breached a seawall in Manila Bay. The Office of Civil Defense said the death toll from Nesat has risen to 52 after two more victims drowned in its floodwaters. It said 31 others were missing.
Nesat also pummeled southern China and was downgraded to a tropical storm just before churning into northern Vietnam on Friday afternoon, where flood warnings were issued and 20,000 people evacuated. There were no immediate reports of casualties in Vietnam and the country did not appear to have suffered any major problems.
In the Philippines, nearly 400,000 hunkered down in evacuation centers and in homes of relatives and friends along the new typhoon's path. There was heavy rainfall of about an inch (25 millimeters) an hour within the storm's 340-mile (630-kilometer) diameter that put the northern provinces including the capital on alert.
Isabela authorities earlier shut down electricity in the province to prevent accidents from falling power pylons and snapped cables.
The howling winds toppled trees and blew away tin roofs of some houses in Isabela's provincial capital of Ilagan. In nearby Luna township, a bus with about 30 passengers fell on its side on a rice field because of the strong winds, but no one was seriously injured, police said.
He urged residents still refusing to leave their homes despite the floods from Typhoon Nesat to evacuate because the water was going to rise as Typhoon Nalgae, aggravated by the seasonal monsoon, dumped more rain over the northern region, including the capital, Manila, later Saturday.
Yumul said the evacuation is "non-negotiable" because lives are at stake.
At least five towns in the rice-growing province of Bulacan and Pampanga, north of Manila, remained submerged three days after Typhoon Nesat had moved on.
"We have nowhere to go," Celenia Espino of Calumpit township said from her home, which was filled with knee-deep murky water. "We have no means of transportation out of here."
She was one of the thousands who sought shelter on rooftops with no food, water and electricity, while a procession of other residents waded in chest-deep water down main roads to reach dry land.
Ramos said rescue boats would be sent for the residents before nightfall.
Elsewhere, Ramos said there had been no contact with several coastal towns facing the Pacific Ocean that were in the path of the typhoon hours after it made landfall. There was no electricity and mobile telephone cell sites had been damaged and communication to the area would be re-established after the typhoon passed, he said.
In the last four months, prolonged monsoon flooding, typhoon and storms across Southeast Asia, China, Japan and South Asia has left more than 600 people dead or missing.
In India alone, the damage is estimated to be worth $1 billion, with the worst-hit state of Orissa accounting for $726 million.
Several studies suggest an intensification of the Asian summer monsoon rainfall with increased atmospheric carbon dioxide concentrations, the state-run Indian Institute of Tropical Meteorology said. Still, it is not clear that this is entirely because of climate change, especially in India, it said.
The damage from the earlier typhoon in the Philippines was estimated at $91 million.
Nalgae, a Korean word for wing, was forecast to reach Luzon's western shore Saturday evening and exit into the South China Sea as a weakened category-1 typhoon as it moves toward China's Hainan Island on Monday.
Back-to-back typhoons left at least 55 people dead and rescuers scrambling on Sunday to deliver food and water to hundreds of villagers stuck on rooftops for four days because of flooding in the northern Philippines.
Typhoon Nalgae slammed ashore in northeastern Isabela province Saturday then barreled across the main Luzon Island's mountainous north and agricultural plains that were still sodden from fierce rain and wind unleashed by a howler just days earlier. Nalgae left at least three people dead Saturday while Typhoon Nesat killed 52 others in the same region before blowing out Friday.
Nalgae was whirling 124 miles (200 kilometers) over the South China Sea from the country's northeast toward southern China early Sunday with sustained winds of 81 miles (130 kilometers) per hour and gusts of 99 mph (160 kph), according to the government weather agency.
Its ferocious wind set off a rockslide in northern Bontoc province Saturday, causing boulders to roll down a mountainside and smash on a passing van, where a passenger was pinned to death and another was injured, police said.
Nalgae roared through a similar path across areas on Luzon saturated by Typhoon Nesat, which trapped thousands on rooftops and sent huge waves that breached a seawall in Manila Bay. Nesat also pummeled southern China and was downgraded to a tropical storm just before churning into northern Vietnam on Friday afternoon, where flood warnings were issued and 20,000 people evacuated.
In the rice-growing province of Bulacan north of Manila, hundreds of residents in flooded Calumpit town remained trapped on rooftops in four villages for the fourth day, many of them desperately waving for help. Rescuers aboard rubber boats could not reach them because of narrow alleyways. Two air force helicopters would be deployed Sunday to drop water and food packs to the marooned villagers, officials said.
Calumpit Mayor James de Jesus pleaded for more help from the national government.
"The ones waving for help are the ones who need to be rescued first because they have elderly people and children with them," de Jesus told ABS-CBN TV network. "We have a very big problem here ... we're facing a long flooding."
Benito Ramos, a retired army general who heads the Office Civil Defense, said floodwater was receding in many areas but freshly-dumped rains by Nalgae may flow down from the mountainous north to the central Luzon provinces of Bulacan and Pampanga, which act like a catch basin. Some officials said water released from nearby dams have exacerbated the flood.
Ramos said he and many rescuers have not slept for days but were elated to see help from many private groups and provinces unaffected by the typhoons.
"Their resiliency is being tested but many people are still smiling and waving," Ramos told The Associated Press by telephone from Calumpit, where he was overseeing rescue work. "It's grace under pressure."