GRAND FORKS AIR FORCE BASE, ND (trfnews.i234.me) The Air Force’s Thunderbirds arrived at the Grand Forks Air Force Base today. They’ll be the featured performance at the “Northern Thunder, Air & Space Expo” at the Grand Forks Air Force Base this Saturday, June 18, 2022. It’s free and open to the public. Gates open at 8:30 a.m..