Last year was the warmest year on record for land and sea, partly because seasonal El Nino climate patterns prevailed year-round, and melting ice pushed sea levels to the highest ever, a study based on the work of more than 450 scientists worldwide confirmed.

Global sea levels swelled to a high, tropical cyclones multiplied, and the world’s thermometer set a record in 2014, according to a report that tracks climate.

The deadly tornado that struck near Oklahoma City had a record-breaking width of 2.6 miles and was the second top-of-the-scale EF5 twister to hit the area in less than two weeks, the National Weather Service said.