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6 FLOODS OF SEPT. 1970 IN ARIZ" UTAH. COLO.. AND N. MEX. STORMS AND WEATHER CONDITIONS 5 FIGURE 3.-Imagery from ITOS I satellite, 1550 hours, m.s.t., September 5, 1970. Oroit number 2820; picture center at lat 350 N", long 1200 W. Photograph from the National Environmental Satellite Service. FIGURE 2.-Imagery from ITOS I satellite, 1453 hours, m.s.t., September 4. 1970. Orbit number 2807; picture center at tat 35'" N., long IOSD W. Photograph from the National Environmental Satellite Service. mountains and the northeastern plateau of Arizona; in southwestern Colorado the rain continued to fall on September 6 as the northern part of the cold front advanced into Colorado. Although the southern part of the front had slowed and weakened, renewed storm activity continued throughout the evening of September 5 from Buckeye, Ariz., eastward. By the morning of September 6, a weak cold front-the last remnant of the storm-between Tucson and Douglas, Ariz., was causing rain in the mountains of southeastern Arizona. Rainfall was particularly heavy in the Santa Catalina Mountains near Tucson. By late on September 6, the rain had ceased, and the Labor Day weekend storm had come to an end. than 5 in. (125 mm) of rain are mainly in the mountains of central Arizona and along the Mogollon Rim; other areas that received more than 5 in. (125 mm) of rain are the Santa Catalina Mountains and the east front of the Baboquivari Mountains in southern Arizona, the White Mountains in eastern Arizona, the headwaters of Montezuma Creek and Yellowjacket Canyon near the Utah-Colorado border, and the .San Juan Mountains in southwestern Colorado. More than 10 in. (255 mm) of rain feU in small areas in the Sierra Ancha, Mazatzal Mountains, and near the Mogollon Rim in central ArizOl,a. The cODfiguration of the lines of equal rainfall shown on plate I for the mountains ill central Arizona was improved using the infortnationobtained from a field investigation of runoff from small drainage areas. A better definition of the 4- and 5-in. (100- and 125-mm) lines was obtained using runoff data in conjunction with rainfaU data than could have been obtained using only rainfall data. In areas that received less than 3 in. (75 mm) of rain. RAINFALL During the storm of September 3-6, at least 1 in. (25 mm) of rain fell over an area that extends northeast from the Arizona-Mexico international boundary into southwestern Colorado (pI. 1). The areas that received more , I I , I