* WHAT...Flash flooding caused by excessive rainfall is possible.
* WHERE...Portions of northwest Arizona, including the following areas, Hualapai Mountains, Lake Havasu and Fort Mohave, Lake Mead - AZ side, Lake Mohave - AZ side, Northwest Deserts and Northwest Plateau, southeast California, including the following areas, Cadiz Basin, Eastern Mojave Desert, Morongo Basin and San Bernardino County-Upper Colorado River Valley, and Nevada, including the following areas, Lake Mead - NV side, Lake Mohave - NV side, Las Vegas Valley, Lincoln County, Northeast Clark County, Sheep Range, Southern Clark County, Spring Mountains-Red Rock Canyon and Western Clark and Southern Nye County.
* WHEN...From Saturday morning through late Sunday night.
* IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. Low-water crossings may be flooded.
* ADDITIONAL DETAILS... - Incoming tropical moisture will lead to widespread shower and thunderstorm activity, some of which may cause flash flooding. - http://www.weather.gov/safety/flood