• 2017 Atlantic hurricane season
  • Hurricane Irma, now a Category 2 hurricane with maximum sustained winds of 110 miles per hour (175 kilometers per hour), is expected to resume strengthening this weekend increasing the danger when it nears the Leeward Islands in the Caribbean next Thursday. (Weather Channel) (CNN) (National Hurricane Center)

• Great Lakes
  • Researchers report, in the Environmental Science & Technology journal, the discovery of antidepressant concentrations in 10 kinds of fish in the Niagara River, which links to the Great Lakes via Lakes Erie and Ontario. Speculated causes include inadequate treatment of water re-introduced into said bodies of water. (New York Daily News)

• South Korea–United States relations, 2017 North Korea crisis
  • South Korean President Moon Jae-in and U.S. President Donald Trump agree to revise the South Korea Ballistic Missile Range Guidelines which caps South Korea's missile development. (Reuters)

• United States Court of Appeals for the Seventh Circuit
  • United States federal judge Richard Posner has announced his retirement after three decades of service on the bench of the 7th U.S. Circuit Court of Appeals, headquartered in Chicago, Illinois. Appointed by President Ronald Reagan in 1981, Justice Posner has written more than 3,300 opinions from the bench. (AP)

• 2017 New Zealand general election
  • The Labour Party, led by Jacinda Ardern, surges in the polls and is neck-and-neck with the National Party, led by Bill English, for the race for Prime Minister of New Zealand. (The Guardian)
• 2017 Kenyan general election
  • The Supreme Court of Kenya annuls the results of the recent presidential election, that indicated President Uhuru Kenyatta was reelected, due to irregularities, and orders a new election. (BBC)
• Presidency of Donald Trump
  • Paul Ryan (R-WI), U.S. Speaker of the House of Representatives, urges President Donald Trump not to rescind the Deferred Action for Childhood Arrivals (DACA) program that protects immigrants who illegally entered the U.S. as children from deportation. (Reuters)
  • President Trump nominates Oklahoma congressman Jim Bridenstine, member of the House Committee on Science, Space, and Technology, to be Administrator of the National Aeronautics and Space Administration. (Politico)

• 2017 in astronomy
  • Asteroid 3122 Florence, which is roughly 2.7 miles (4.4 kilometers) wide, comes within 4.4 million miles (7 million km) of Earth — approximately 18 times the distance from our planet to the Moon. (Space)