Canyoneers who disregard ranger warnings have died in flash floods. If a park ranger suggests staying away from certain canyons, heed the advice. When picking up canyoneering permits, ask about the weather. Flash flood alerts, which are issued by the National Weather Service, prompt the closure of The Narrows and other potentially dangerous trails.Ĭanyoneers, who seek out narrow canyons, face the greatest danger from flash floods. Zion posts weather forecasts at all park entrances and visitor centers, and flash flood alerts are posted on Twitter. The best way to avoid flash floods is to stay away from narrow canyons when the forecast calls for rain. Squeezing into a crack or crevice along a rock wall is another last-ditch option. If there is no high ground, seek shelter behind a large rock that can break the wall of oncoming water. Even if you are only a few feet above the water, those few feet can save your life. It is not possible to outrun or outswim a flash flood. If you find yourself in the path of a flash flood, climb as high as you can as quickly as possible. The wall of water often moves so fast that it compresses the air in front, sending pebbles and small rocks flying through the air. If a thunderstorm several miles distant dumps rain over a canyon’s headwaters, a flash flood can roar downstream, catching unsuspecting hikers and canyoneers by surprise. Perhaps most frightening, flash floods can happen when skies are sunny and clear overhead. Runoff channels into narrow side canyons, forming flash floods that can reach speeds topping 23 feet per second, ripping out trees and vegetation and tumbling boulders like ice cubes. Storms can dump several inches of rain in just a few hours, and the rocky, sun-baked landscape does little to absorb the water or slow it down. During monsoon season-July, August, September-powerful thunderstorms sweep through the region. Zion Flash Floodsįlash floods are one of Zion’s greatest dangers. Zion is located on the North American Monsoon’s western edge, which shifts annually, so some summers are extremely wet while others are unusually dry. July through mid-September is called “monsoon season” in the Southwest, and flash floods are a serious threat during this time.īut the intensity of Zion’s monsoon season varies from year to year. The storms generally dissipate by evening, and the next morning the cycle repeats itself. Eventually the clouds burst, producing torrential afternoon thunderstorms. Hot air rises as fast as 50 feet per second, creating an area of low pressure that draws warm, humid air from the Gulf of California and the Gulf of Mexico.Īs the hot, humid air rises it comes into contact with cold, high-altitude air, forming enormous anvil-headed clouds that grow dark and ominous as they rise thousands of feet. Zion’s weather is heavily influenced by the North American Monsoon, which affects seasonal precipitation throughout the American Southwest.ĭuring the hottest months of the year-July through mid-September-the desert bakes under intense solar radiation. See also Best Times to Visit Zion National Park Monsoon Season Zion Summer Weather Take a few minutes to learn about Zion’s weather, and you can safely enjoy one of America’s most amazing national parks. Flash floods (see below) are a serious risk when exploring Zion’s narrow canyons, particularly during the summer monsoon season. Understanding Zion’s weather patterns will not only help you plan a great trip to the park-it could also save your life. Summer is hot with regular thunderstorms. Weather in Zion National Park varies significantly throughout the year.
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