Typhoons in the Philippines can occur any time of the year, with the months of June to September being most active, with August being the most active individual month and May the least active. Approximately 20 tropical cyclones enter the Philippine area of responsibility yearly, an area which incorporates parts of the Pacific Ocean, the South China Sea, and the Philippine Archipelago (with the exception of Tawi-Tawi province). In each year, ten cyclones are usually expected to be typhoons, with five having the potential to be destructive ones. According to a 2013 Time Magazine article, the Philippines is "the most exposed country in the world to tropical storms". In the Philippine languages, tropical cyclones are generally called . Typhoons usually move east to west across the country, heading north or west as they go. Storms most frequently make landfall on the islands of Eastern Visayas, Bicol region, and northern Luzon, whereas the southern island and region of Mindanao is largely free of typhoons. Climate change is likely to worsen the situation, with extreme weather events including typhoons posing various risks and threats to the Philippines. The deadliest overall tropical cyclone to affect the Philippines is believed to have been the Haiphong typhoon, which is estimated to have killed up to 20,000 people as it passed over the country in September 1881. In modern meteorological records, the deadliest storm was Typhoon Yolanda (international name Haiyan), which became the strongest landfalling tropical cyclone on record at that time as it crossed the Visayas in central Philippines on November 7–8, 2013. The wettest known tropical cyclone to impact the archipelago was the July 14–18, 1911 cyclone which dropped over of rainfall within a 3-day, 15-hour period in Baguio. Tropical cyclones usually account for at least 30 percent of the annual rainfall in the northern Philippines while being responsible for less than 10 percent of the annual rainfall in the southern islands. PAGASA Senior Weather Specialist Anthony Lucero told the newsite Rappler that the number of destructive typhoons have increased recently but it is too early to call it a trend. Tropical cyclones entering the Philippine Area of Responsibility, as well as tropical depressions that form within it, are given a local name by the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA), which also raises public storm signal warnings as deemed necessary. Preparation and response to typhoons is coordinated by the National Disaster