S7·E5 Finger of God

Calvin Chillcut is a storm-chaser who tracks tornadoes for the National Severe Storms Lab. But die to the dearth of storm activity, the NSSL has just informed him to cease and desist. Distraught over the news, Calvin ties one on and sleeps through the first twister in 2 years. The next day, Calvin shows up at the local watering hole (the Die Hard Diner) with a hangover, and by this point, it's clear that a major storm is headed their way. Tess points out that Calvin doesn't have to turn in his equipment until tomorrow and urges him to stop feeling sorry for himself and get busy. Calvin takes her advice and starts tracking the storm and along the way stops to pick up a hitchhiker, Monica. Calvin explains it's his last day, barring a miracle. And before long, that's just what he gets, in the form of a twister. As the Civil Defense Tornado Warning sirens sound, the Sheriff advises everyone the diner to take cover. Some take his advice, but most feel perfectly safe in the diner,