Fourteen areas in Luzon remain under signal number one as Tropical Depression ''Mirasol'' continued to move northwestward after making land fall over the area of Casiguran, Aurora on Wednesday.

As of 5pm, ''Mirasol'' was last spotted at vicinity of Kabugao, Apayao with maximum sustained winds of 55 kph near the center and gustiness of up to 80 kph, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (Pagasa) said.

The state weather bureau said the tropical depression is moving northwest at the speed of 20 kph.

''Mirasol'' is expected to continue to move northwestward within the next 12 hours while traversing Northern Luzon.

The tropical depression will re-emerge over the coastal waters of Ilocos Norte on Wednesday night and continue to move generally northwestward until it exits the Philippine Area of Responsibility on Thursday morning.

"Mirasol will maintain its strength as it crosses the Northern Luzon landmass. Once it is over the waters west of Ilocos Norte, it is forecast to intensify and may reach tropical storm category tonight or tomorrow early morning," the state weather bureau said.

"Mirasol will remain as a tropical storm throughout the forecast period. However, further intensification to severe tropical storm is not ruled out," it added.

The areas remain under Tropical Cyclone Wind Signal number one were "Batanes, Cagayan including Babuyan Islands, the western and northern portions of Isabela (Santo Tomas, Alicia, San Mateo, Aurora, Santa Maria, Quezon, Ramon, Naguilian, Roxas, Luna, Delfin Albano, City of Cauayan, San Pablo, Ilagan City, City of Santiago, Tumauini, Cabagan, Reina Mercedes, San Manuel, Cabatuan, Quirino, Gamu, San Isidro, Mallig, Cordon, Maconacon, Burgos, Divilacan), the northwestern portion of Quirino (Diffun, Saguday), the northern portion of Nueva Vizcaya (Kayapa, Ambaguio, Bayombong, Villaverde, Solano, Quezon, Bagabag, Diadi), Apayao, Abra, Kalinga, Mountain Province, Ifugao, the northern portion of Benguet (Bakun, Mankayan, Buguias, Kabayan, Atok, Kibungan, Kapangan, Bokod), Ilocos Norte, Ilocos Sur, and the northern portion of La Union (Luna, Bangar, Sudipen, Santol, San Gabriel, Balaoan, Bacnotan, San Juan, City of San Fernando, Bagulin)". Robina Asido/DMS