MANILA (UPDATE) Tropical Storm Ambo (international name: Vongfong) is expected to bring heavy to moderate rains over northern Luzon even after it weakened slightly on Saturday morning, state weather bureau PAGASA said.

The first storm of 2020 was spotted 75 kms west northwest of Laoag City, Ilocos Norte at 1 p.m., packing winds of 65 kilometers per hour near the center and 80 kph gusts, said PAGASA.

Moving north northwest at 25 kph, Ambo will dump moderate to heavy rains over Cagayan Valley, and light to moderate with at times heavy rains over Ilocos and the Cordillera regions, and the northern portions of Aurora and Zambales.

Residents in these areas should look out for potential floods and landslides, warned the weather agency.

The storm earlier damaged houses and downed trees and electric posts in Quezon, Bulacan, Nueva Ecija and Pangasinan provinces.

Nasira ang ipinapagawang bahay ni Ariel Villegas sa Real, Quezon matapos magkaroon ng landslide at bumagsak ang mga puno dahil sa lakas ng Bagyong #AmboPH.

Kwento niya, mabuti na lang at wala sila roon noong lumakas ang hangin kaya sila nakaligtas. | via @JervisManahan pic.twitter.com/JosiKPQS8F

— ABS-CBN News (@ABSCBNNews) May 16, 2020

Wasak ang mga bahay sa San Francisco, Quezon dahil sa bagyong #AmboPH.
Kuwento ng mga residente, napakalakas ng hangin na mistulang buhawi ang tumama sa kanila | via @Dennis_Datu pic.twitter.com/j8duNjirfs

— ABS-CBN News (@ABSCBNNews) May 16, 2020

Agad nagsagawa ng clearing operations ang mga crew ng DPWH-Eastern Samar district engineering office para masiguro na madadaanan ang lahat nga kalsada na naapektuhan ng pananalasa ng bagyong #AmboPH. (Kuha ng DPWH-ESDO) | ulat ni Ranulfo Docdocan pic.twitter.com/HzNyKAMS1J

— ABS-CBN News (@ABSCBNNews) May 16, 2020

Ambo killed at least 3 in Eastern Samar, where it first made landfall, and one other in Quezon, said local officials.

Patay ang isang 62 anyos na lola at sugatan ang 66 anyos na asawa matapos na mabagsakan ng gumuhong pader ng kanilang bahay dahil sa bagyong #AmboPH sa Brgy. San Vicente Silangan, Catanauan, Quezon | via @Dennis_Datu pic.twitter.com/0OskxB9e6T

— ABS-CBN News (@ABSCBNNews) May 16, 2020

Moderate to heavy rains are also expected over Batanes and Babuyan Islands by Sunday before Ambo leaves the Philippine area of responsibility on Monday, PAGASA said.

The following areas, which may be whipped by 61 to 120 kph winds within 24 hours, remain under signal number 2:

• Ilocos Norte

Signal number 1, where wind speeds of 30 to 60 kph may be experienced within 36 hours, is hoisted over:

• Ilocos Sur
• Abra
• Babuyan Islands
• Batanes
• Cagayan
• Western portion of Isabela (Sta, Maria, Sto. Tomas, Delfino Albano, San Pablo, Cabagan, Tumauini, Quirino, Mallig, Quezon, Roxas, San Manuel, Burgos, Gamu, Reina Mercedes, Luna, Aurora, Cabatuan, San Mateo, Ramon)
• Western portion of Nueva Vizcaya (Villaverde, Solano, Bayombong, Ambaguio, Bambang, Kayapa, Aritao, Santa Fe)
• Apayao
• Kalinga
• Benguet
• Mountain Province
• Ifugao
• La Union
• Pangasinan

Ambo first made landfall over San Policarpo in Eastern Samar and later hit Dalupiri Island, Northern Samar; Capul Island, Northern Samar; Ticao Island, Masbate; Burias Island, Masbate; and San Andres in Quezon.

The water level of Angat Dam, the main water source of Metro Manila, was 190.19 meters as of 6 a.m., up by 2.66 meters from Friday, said PAGASA.

Visit the ABS-CBN Weather Center for more updates