Tropical storm Noul unroofed homes, destroyed crops and sunk more than 100 unmanned boats in southern Vietnam, but spared Ho Chi Minh City and the Mekong delta rice bowl, the government said Tuesday.

The storm was downgraded into a tropical low pressure system as it made landfall late Monday, after authorities earlier issued storm alerts, called ships ahore, closed schools and evacuated about 90,000 coastal residents.

Two people were killed during what was the tenth major storm of Vietnam's typhoon and storm season when they were electrocuted while preparing a house near the resort town of Nha Trang, authorities said.

Noul, or Red Sky, made landfall with maximum wind speeds of 75 kilometres (45 miles) per hour in Khanh Hoa and Ninh Thuan provinces, north of Vietnam's largest city and the vulnerable Mekong River delta.

Dozens of houses were unroofed and about 3,000 hectares (7,000 acres) of crops destroyed, central emergency services in Hanoi said.

Rain-hit provinces were alerted Tuesday about possible flash floods, landslides in mountain areas and flooding in low-lying regions.

Vietnam has repeatedly suffered heavy storms this year which brought the worst flooding in decades to the capital Hanoi in recent weeks, while tidal surges have inundated large areas of Ho Chi Minh City.

The rains that hit Hanoi and north-central Vietnam this month, killing at least 82 people, also destroyed more than 180,000 houses and 245,000 hectares of winter crops, the state-run Vietnam News Agency (VNA) reported.

The Vietnam Red Cross and International Federation of Red Cross and Red Crescent Societies on November 12 launched an appeal for four million dollars in relief aid for nearly 300,000 people in northern Vietnam, VNA said.