MANILA — Tropical depression Samuel entered the Philippine area of responsibility before Sunday noon, threatening to dump moderate to heavy rains over large swaths of Mindanao, the state weather bureau said. Samuel was 980 kilometers east southeast of Hinatuan, Surigao del Sur at 10 a.m., packing maximum sustained winds of 55 kilometers per hour and 65 kph gusts, PAGASA said. The storm may unleash floods and landslides in Caraga, Davao Oriental and Compostela Valley regions starting Monday, the agency warned. Samuel could also intensify into a severe tropical storm, the third strongest category in a 5-step system, with at least 89 kph top sustained winds, PAGASA meteorologist Gener Quitlong told radio DZMM. The country’s 19th storm this year may hit land in Caraga on Tuesday before barreling across Central and Western Visayas, and Palawan, he said. Samuel’s outer bands could also stir rains over Metro Manila, he added. PAGASA advised small seacraft to refrain from sailing off the eastern seaboards of Visayas and of Mindanao due to the storm. The tropical depression may leave the Philippine area of responsibility on Wednesday night or Thursday morning, said Quitlong.