SIGNAL No. 1 remained up over Batanes and Babuyan Islands as tropical depression “Ambo” (international name: Vongfong) hovered over the Luzon strait on Sunday morning, the weather bureau said.

The Philippine Atmospheric, Geophysical and Astronomical Services Administration (Pagasa) last spotted Ambo at 125 kilometers west-northwest of Calayan, Cagayan as of 5 a.m. It was carrying maximum sustained winds of 45 kilometers per hour (kph) near the center and gustiness of up to 55 kph. Pagasa said it was almost stationary.