The remnants of Tropical Storm Rosa continue to pose a threat of flash flooding for the US Southwest, notably southern Arizona, Utah, eastern Nevada, and southwestern Colorado. Flash flood watches are in effect for those areas until the late evening (local time) of Tuesday, October 2, or the morning of Wednesday, October 3. Heavy, sudden rain in desert areas may produce life-threatening flooding and debris washes of rocks, mud, and vegetation, particularly in low-lying areas such as canyons, washes, or riverbeds, and areas with recent fire activity. Flash flooding may occur even at large distances from rainstorms.
Tropical cyclones and hurricanes are common in the east Pacific from May through November, though most do not make landfall. Rainfall in desert areas frequently produces flash flooding, even at large distances from storms.
Individuals in the affected areas are advised to monitor local weather reports, anticipate flooding and transportation disruptions, avoid low-lying areas, including washes, riverbeds, and canyons, and adhere to instructions issued by local authorities. Remember that flash flooding and debris flows can occur at large distances from rainfall and that walking or driving through running water can be dangerous - 15 cm (6 in) of running water is enough to knock over an adult.
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