A Day Called ‘X’ was a dramatized CBS documentary set in Portland, Oregon in which the entire city is evacuated in anticipation of a nuclear air raid, after Soviet bombers had been detected by radar stations to the north; it details the activation of the city’s civil defense protocols and leads up to the moment before the attack (the ending is left intentionally unknown). It was filmed in September 1957 and aired December 8 of that year. It was presented by Glenn Ford.
This is particularly interesting to me because I grew up in Portland in the 1960’s. The city has sure changed a lot. There might have been a half million people in Portland back in those days. That’s about 3 million now.