A powerful microburst tore through the park on the evening of Wednesday, August 29th. Tornado-like winds downed power lines along the eastern boundary of the park, depriving approximately 2500 Coolidge residents of electrical power. A century-old saguaro cactus near the entrance gate to the park was cut in half by electrical lines and other cacti were damaged when a series of ten electrical poles snapped in two along the boundary fence. Some trees that shaded park visitor and administrative facilities were uprooted and branches were stripped off of many others. The park, which is open to the public from 8:00 a.m. to 5:00 p.m. daily, was closed for the evening when the storm occurred. No one was injured and there was no significant damage to facilities or cultural resources. The park was closed to the public through Friday due to downed electric lines, repair work, and equipment blocking the entrance to the park. NPS staff worked with electricity providers to repair poles on the park boundary and reestablish service to the community of Coolidge. Microbursts are not uncommon in Arizona deserts. A microburst, according to University of Illinois Department of Atmospheric Sciences, is a strong downdraft which includes an outburst of potentially damaging winds on or near the ground, covering an area less than 2.5 miles in diameter. They are capable of generating wind speeds higher than 160 mph.