(CNN Philippines) Metro Manila — A tropical storm (TS) east of Mindanao could intensify into a super typhoon and enter the Philippine Area of Responsibility (PAR) by next week, the state weather bureau warned on Saturday.

The storm was last spotted 2,525 kilometers east of Mindanao, outside of the PAR, and embedded along the Intertropical Convergence Zone (ITCZ) – an area where the northeast and southeast trade winds converge to form clouds and rains, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) said.

The storm was packing maximum sustained winds of 45 kilometers per hour (kph) and gusts of 55 kph. It was seen moving northward at 20 kph and is expected to move north-northwest towards Guam by Sunday then northwestward by Wednesday.