June 23 edit
1544: Artemius of Verkola, a saint in the Russian Orthodox Church, was killed by lightning.
1925: After weeks of heavy rain and snowmelt, the Gros Ventre landslide occurred on the north side of Sheep Mountain, Wyoming. The slide blocked the Gros Ventre River, forming Lower Slide Lake.
1944: An unusual long-lived tornado tracked through mountainous West Virginia, killing 100 people.
1981: The NOAA-7 weather satellite was launched into a polar orbit. NOAA-6 returned a wide variety of observations of the earth, atmosphere, oceans, and space for 5 years until a power failure in June 1986.
2016: A rare violent tornado struck Jiangsu Province, China, killing 99 people.