* WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...A portion of northwest Arizona, including the following areas, Hualapai Mountains, Lake Havasu and Fort Mohave, Northwest Deserts and Northwest Plateau. * WHEN...From noon MST today through this evening. * 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... - Persistent Storm chances will lead to locally heavy rainfall that can lead to flash flooding across the watch area - http://www.weather.gov/safety/flood