from ukraine, as fears grow about retaliation. back-to-school spending skyrockets. cbs janet shamlian talks to a single mom struggling to check off her preschooler s supply list. i would probably put it around $50 to $75. reporter: and it s not complete. it s not complete, no. this is the cbs evening news with norah o donnell, reporting tonight from new york city. o donnell: good evening to our viewers in the west and thank you for joining us, as we start a new week together. tonight, millions of americans in the southwest are under flood warnings, after monsoon rains drenched communities across parts of six states, north texas getting worst of it. the dallas-forth worth area, suffering from a months-long drought, was pummeled with more than nine inches. that s the second heaviest rainfall in the city s history. it was the equivalent of a summer s worth of rain in one 24-hour period. floodwaters rushed through the streets, submerging vehicles. and, we re learning t