Manila, May 15 -- Severe Tropical Storm (STS) "Ambo" slightly weakened, and may make landfall over Real or Infanta, Quezon between 5 p.m. to 7 p.m. Friday, the state weather bureau said on Friday. In its 5 p.m. bulletin, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) said Ambo was last tracked 40 kilometers south of Infanta, Quezon, moving northwestward at 20 kph. It packs maximum sustained winds of up to 100 kph near the center, and gustiness of up to 140 kph. On Friday night, moderate to heavy with at times intense rains may be experienced over Quezon, Marinduque, Aurora, Laguna, Batangas, Rizal, Metro Manila, Bulacan, Pampanga, Nueva Ecija, Nueva Vizcaya, and Quirino. Tropical cyclone wind signa...