The tropical depression (essentially a group of thunderstorms) originated in the Philippine Sea. Five days later, on August 7, it morphed into a super typhoon, with a wind speed of at least 150 miles per hour.The Red Cross estimated that more than 17,000 households in the Philippines were affected by the disaster.China uses a color-coded system to inform citizens about weather conditions. Before the storm made landfall, China's weather bureau issued a red alert — the most severe type of warning.In 2017, the theme park became the most-visited site in China, with more than 11 million annual visitors.Evacuees included more than 250,000 residents in Shanghai and 800,000 residents in China's Zhejiang province. By that time, Lekima had weakened to the equivalent of a Category 3 storm, with wind speeds of 116 miles per hour. The National Oceanic and Atmospheric Administration classifies Category 3 storms as capable of causing devastating damage.An estimated 200 homes in the Zhejiang province also collapsed due the storm. Around 2.7 million of the province's households endured blackouts as the storm ravaged electricity lines.The storm is now headed toward Shanghai, a city with more than 20 million people. Lekima is the third-largest typhoon on record in China.