1. On April 27, 1933, the United States government established the Civilian Conservation Corps to help combat unemployment during the Great Depression. The CCC provided jobs for young men to work on conservation and infrastructure projects, including several in Oklahoma.

2. In 1978, Oklahoma State Senator Gene Stipe became the state's longest-serving senator, having been in office for 20 years. Stipe was known for his advocacy for rural and agricultural issues, and was a powerful leader in the state's Democratic Party.

3. On April 27, 1994, a tornado outbreak struck Oklahoma, killing at least four people and causing extensive damage across the state. One of the most destructive tornadoes of the outbreak, rated as an F4 on the Fujita scale, struck the town of Wilburton, destroying several buildings and causing multiple injuries.

4. Oklahoma City's National Memorial was dedicated on April 27, 2000, to honor the victims of the 1995 Oklahoma City bombing. The memorial features a reflecting pool, a field of empty chairs to represent the 168 killed in the attack, and the Survivors' Wall, which lists the names of those who survived despite being injured in the bombing.

5. In 2011, the Oklahoma City Thunder basketball team clinched their first playoff series victory since moving to Oklahoma City from Seattle in 2008. The Thunder defeated the Denver Nuggets in five games, including a memorable 107-103 victory in Game 5 that featured a 15-point comeback in the final eight minutes.