31. After passing Manila, the storm was expected to threaten several northern provinces surrounding the Mount Pinatubo volcano. 32. In 1991, Clark Air Base in the Philippines was evacuated due to the eruption of Mount Pinatubo . 33. As it crossed Luzon, Sharon caused flooding and released mudflows from Mount Pinatubo , killing two people. 34. It was warm from the heat still trapped in the volcanic debris from Mount Pinatubo 's 1991 eruption. 35. The United States abandoned the base in 1991 when it was badly damaged by the eruption of Mount Pinatubo . 36. Several areas, including those near Mount Pinatubo and regions affected by a record number of typhoons in 1995. 37. Officials were on alert to evacuate villagers away from swollen rivers washing down the slopes of Mount Pinatubo volcano. 38. The administration also faced a series of natural disasters, including the eruption of Mount Pinatubo in June 1991. 39. "' VEI 6 "'eruptions occurred at Krakatoa in 1883 and Mount Pinatubo in 1991. 40. The Lubao-Sasmuan River was one of the ecosystems heavily affected when Mount Pinatubo erupted 20 years ago.
