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and missing in america. after seeing our report, one familys 30-year-old mystery finally solved >> announcer: this is "nbc nightly news" with lester holt >> good evening. the american west is scorching tonight under a smooth ring heat dome that wont giving producing temperatures never before seen in september. breaking records by as much as 5 degrees. sacramento no stranger to summer heat reaching a record high of 114 yesterday at 104, salt lake city topping its september record for th...