1. On April 13, 1945, a tornado outbreak occurred in Oklahoma that resulted in the deaths of 28 people. The town of Woodward was hit particularly hard, and it is estimated that over 100 homes were destroyed.

2. On April 13, 1935, a massive dust storm swept through the Oklahoma panhandle during the height of the Dust Bowl era. Known as Black Sunday, the storm is considered one of the worst dust storms in American history.

3. In 1904, on April 13th, the first-ever Oklahoma State Fair was held in Oklahoma City. The annual event has become a popular tradition in the state and typically draws hundreds of thousands of attendees each year.

4. On April 13, 1898, Oklahoma was officially designated as a territory by the United States Congress. This paved the way for statehood, which would not occur until 1907.

5. On April 13, 1970, astronaut Thomas P. Stafford, an Oklahoma native, commanded the Apollo 13 mission to the Moon. The mission encountered unexpected challenges when an oxygen tank exploded, but the crew was successfully returned to Earth.