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Hurricane Lily (1971)

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The hurricane was Puerto Vallarta's worst in two decades and the second hurricane of the season to heavily impact Mexico after Hurricane Bridget. The storm caused the Cuale River to overflow its banks, inundating the downtown section of Puerto Vallarta with water that was up to 8 feet (2.4 m) deep in some sections. The Mexican army flew in aid after trucks were blocked by flooded roads. The hurricane claimed three lives on the mainland and nine lives when a boat capsized.

Meteorological history

On August 25, Tropical Storm Chloe made landfall on British Honduras (present day Belize) as a tropical depression. After dissipating, the remnants of the storm crossed into the Pacific Ocean, where they contributed to an area of shower activity that persisted over the Gulf of Tehuantepec. On August 28, the tropical activity organized around a circulation which quickly developed into a tropical depression the same day. The depression was upgraded to a tropical storm on August 29 based on satellite presentation that depicted significant cirrus outflow and a comma–shaped cloud mass spanning 2° of latitude in diameter and was subsequently named Lily.

Following its upgrade to tropical storm intensity, Lily began developing a spiral cloud structure and heavy anticyclonic outflow on August 30 and was upgraded to a hurricane the same day. During its intensification, United States Air Force reconnaissance tried to fly into the hurricane, but penetration was rendered impossible due to the cumulonimbus clouds in the spiral bands, causing the aircraft to rely on radar readings, which showed an eye 40 miles (64 km) in diameter. Following the flight, the hurricane turned to the north-northwestward towards the Mexican coast. On August 31, a ship called the Turrialba reported a 980-millibar (29 inHg) sea–level pressure while in the eye of the hurricane. Shortly after the report, the hurricane peaked in intensity with winds of 85 mph (137 km/h) just prior to landfall 30 miles (48 km) northwest of Manzanillo. The cyclone quickly weakened overland, and after only six hours over land, its winds weakened to only 30 mph (48 km/h), a decline of 55 mph (89 km/h) and the cyclone became extratropical. The now–extratropical Lily continued to cross the Mexican coast, and shortly after emerging over water on September 1, the cyclone dissipated.

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