North Texas July 18, 2017 9:45 pm What Are the Dog Days of Summer? NBC 5 Meteorologist Rick Mitchell explains where the phrase “Dog Days of Summer” originates. Wake Up to Something Good 2:50 School safety: North Texas students return to class after recent school shooting incidents 1:47 Heavy rainfall affects parts of DFW, Kaufman County 2:43 Governor declares state of emergency after Oklahoma tornadoes 2:09 Aftermath of heavy flooding in Kaufman County 1:41 Multiple killed during Oklahoma tornadoes