May 15: Start of the East Pacific hurricane season and end of the Mauritius and Seychelles cyclone season[edit]

1887: A tropical storm formed southeast of Bermuda. This storm would be the first of four off-season tropical cyclones which would form in the Atlantic Ocean that year, the most in recorded history.

1896: The first tornado of a deadly sequence of tornado outbreaks killed 73 people in North-Central Texas.

1966: The Nimbus 2 weather satellite was launched. It collected information about atmospheric temperature and cloud cover until early 1969.

1998: A rapidly moving squall line raced across Minnesota and caused over $1 billion dollars of wind–driven hail damage.

2011: A major wildfire near Slave Lake, Alberta was pushed past fire breaks by winds gusting up to 100 kilometres per hour (62 mph), eventually destroying more than 400 buildings in the town.

2014: Several locations in Serbia and Bosnia and Herzegovina set daily records for rainfall, including 107.9 millimetres (4.25 in) of rain in Belgrade, which contributed to major flooding that killed 86 people.