At 322 PM MST, Doppler radar and automated rain gauges indicated thunderstorms producing heavy rain across portions of the Tucson Metro, extending from Davis-Monthan Air Force Base westward across the south side of Tucson. An automated rain gauge at the Tucson Electric Power Power just west of Davis-Monthan Air Force Base has recorded 1.81 inches in the last hour. Additional rainfall amounts of 0.5 to 1.5 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Life threatening flash flooding. Thunderstorms producing flash flooding. SOURCE...Radar and automated gauges. IMPACT...Life threatening flash flooding of creeks and streams, urban areas, highways, streets and underpasses. Some locations that will experience flash flooding include... Tucson, Davis-Monthan Air Force Base, Drexel Heights, South Tucson, Tucson International Airport and Rita Ranch. This includes the following highways... Interstate 19 between mile markers 60 and 63. Route 86 between mile markers 168 and 171. Interstate 10 between mile markers 259 and 271. This includes the following Flash Flood Prone Locations... Harrison Rd at Pantano Wash, Escalante Rd at Atterbury Wash and Drexel Rd east of Alvernon Way. This includes the following streams and drainages... West Branch Santa Cruz River, Julian Wash, Chico, Arroyo, Santa Cruz River, Tanque Verde Wash, Pantano Wash and Rillito River.