At least 23 areas in Visayas and Mindanao were placed under Storm Signal No. 1 as Tropical Depression Seniang intensified slightly Sunday afternoon, state weather agency PAGASA said. In its 5 p.m. update, PAGASA also said Seniang may make landfall Monday morning in the vicinity of Tandag, Surigao del Sur. PAGASA said that as of 4 p.m., Seniang was estimated at 150 km east of Hinatuan, Surigao del Sur, with maximum winds of 55 kph near the center. It is forecast to move west-northwest at 13 kph and is expected to be 110 km north-northeast of Lumbia by Monday afternoon. By Tuesday afternoon it is expected to be 100 km west of Dipolog City. By Wednesday afternoon it is expected to be 190 km southeast of Puerto Princesa City, Palawan. Under Storm Signal No. 1 are:

Visayas (8 areas)

Leyte

Southern Leyte

Camotes Island

Cebu

Bohol

Negros Oriental

Negros Occidental

Siquijor
Mindanao (15 areas)

Dinagat province

Surigao del Norte

Surigao del Sur

Siargao Island

Agusan del Norte

Agusan del Sur

Compostela Valley

northern part of Davao Oriental

Davao del Norte

Misamis Oriental

Bukidnon

Lanao del Norte

Misamis Occidental

Zamboanga del Norte

Camiguin

Meanwhile, PAGASA said Seniang may bring 7 to 15 mm per hour (moderate to heavy) of rainfall within its 300-km diameter. It reminded residents in low-lying and mountainous areas of the provinces under Signal No. 1, as well as Eastern Visayas and the rest of Mindanao especially Caraga, to be alert against possible flash floods and landslides. Ocean waves may reach up to four meters, and fisher folk and those with small sea crafts are advised not to venture out over the eastern seaboards of Luzon and the seaboard of Visayas and over the northern and eastern seaboards of Mindanao.