 By June 16 , PAGASA raised storm signal number 3 for Batanes and the provinces of Cagayan and Isabela ; storm signal number 2 for all or portions of nine provinces and for Polillo Island ; and storm signal number 1 was raised for portions of four provinces . The signals refer to the potential for winds , from lowest to highest representing weakest to strongest winds ; number 3 refers to the potential for winds of 100 to 185 km / h ( 62 to 115 mph ) within 18 hours . 
