Less common events include natural disasters such as tornadoes, hurricanes, typhoons and ice storms. Squadrons equipped with Hawker Hurricanes, Hawker Typhoons and Spitfires operated from Lasham. The country is also affected by tropical depressions, tropical storms and typhoons. These aircraft are used to study meteorological events such as hurricanes and typhoons. Metro Manila is exposed to multiple natural hazards such as earthquakes, floods, and typhoons. Natural hazards such as typhoons and earthquakes are common in the region. Additionally, climate change will continue to increase the intensity of typhoons and tropical storms. Observers monitored radar sweeps that detected typhoons and heavy rains. Summer rainfall comes from the East Asian Monsoon and from frequent typhoons. The season was above-average, producing 29 storms, 13 typhoons, and 7 super typhoons. Japan receives over half of its rainfall from typhoons. Natural hazards&colon; occasional typhoons (May to January) with extensive flooding, especially in the Mekong Delta. Some of the deadliest typhoons in history have struck China. The islands are also affected by typhoons. The islands are sparsely populated and subject to frequent typhoons.