The Zambales Mountains are a mountain range located on the western side of Luzon, in the Philippines. The mountains separate Luzon's central plain from the South China Sea and extend out as the Bataan Peninsula to the south, enclosing Manila Bay. Mount Pinatubo is an active volcano in the mountain range and it erupted at 8.50 am on June 12, 1991. It was the second most powerful volcanic eruption of the 20th century after the 1912 eruption of Novarupta. The volcanic eruption coincided with the arrival of tropical typhoon Yayong. The U.S. Military Base at Clark Field near Angeles City, Pampanga, was covered in thick volcanic ash and lahar.
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