At 1215 PM MST, Doppler radar and automated rain gauges indicated thunderstorms producing heavy rain across the warned area. Between 0.5 and 1.5 inches of rain have fallen. Additional rainfall amounts up to 0.5 inches are possible in the warned area. Flash flooding is already occurring. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar and automated gauges. IMPACT...Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. Some locations that will experience flash flooding include... Tucson, Marana, Sahuarita, Green Valley, Davis-Monthan Air Force Base, Casas Adobes, Drexel Heights, Flowing Wells, Corona De Tucson, South Tucson, Three Points, Avra Valley, Pascua Pueblo Yaqui Reservation, Tortolita, East Sahuarita, San Xavier Community, Valencia West, Summit, Tucson Estates and Tucson International Airport. This includes the following highways... Interstate 19 between mile markers 31 and 63. Route 86 between mile markers 146 and 171. Route 77 between mile markers 70 and 74. Interstate 10 between mile markers 233 and 275. Route 286 between mile markers 25 and 45. Route 83 between mile markers 42 and 45. This includes the following Flash Flood Prone Locations... Manville Rd at Brawley Wash, Country Club Rd at Franco Wash, Houghton Rd from I-10 & Sahuarita Rd, Santa Clara Ave at El Vado Wash, 1st Ave north of Fort Lowell Rd, Stone Ave at Mabel St, Sahuarita Rd west of Wilmot Rd, Twin Peaks Rd between Sanders and Sandario, Silverbell Rd near Ina Rd, Camino De La Tierra at the Rillito River, Camino de Oeste from Sweetwater to Gates Pass, Drexel Rd east of Alvernon Way, Ironwood Hills Dr from Shannon to Camino de Oeste, Mark Rd from Jeffery Rd to Los Reales Rd, Mission Rd from Valencia Rd to San Xavier Rd, Old Vail COnnection Rd at Franco Wash, Sunset Rd west of Camino de Oeste and Black Wash at S Camino de Oeste. This includes the following streams and drainages... Brown Wash, Santa Cruz River, Rillito River, Box Canyon Wash, Seco, Arroyo, Cienega Creek, Banner Wash, Sopori Wash, Bolas Blancas Wash, Alambre Wash, Soto Wash, Pantano Wash, Thomas Canyon Wash, Guild Wash, Little Thomas Wash, Robles Wash, Los, Saucito Wash, Demetrie Wash, Arivaca Creek, Oro, Caada del, South Mendoza Wash, West Branch Santa Cruz River, Mendoza Wash, Blanco Wash, Champurrado Wash, Altar Wash, Peitas Wash, Fresno Wash, Cerro Prieto Wash, Chico, Arroyo, Gardner Canyon, Old Junction Wash, Fortynine Wash and Brawley Wash.

* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Tohono O'odham Nation. * WHEN...Through this evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Low-water crossings may be flooded. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - Scattered thunderstorms will be developing again this afternoon into this evening. Rainfall rates in excess of 1 inch per hour are expected with the stronger storms with isolated areas having the potential of 1-3 inches. Additional rainfall from the previous day activity will result in faster responses in normally dry washes, creeks and roadway dips. The watch was extended into Monday evening as scattered thunderstorms will also have the potential for 1-3 inches Monday afternoon and evening. - Http://www.weather.gov/safety/flood