MANILA – Tropical Storm Kiyapo intensified early Friday as it moved closer to Extreme Northern Luzon, prompting the state weather bureau to raise Tropical Cyclone Wind Signal (TCWS) No. 2 over parts of Northern Luzon. In its 5 a.m. bulletin, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) said the center of Kiyapo was…