In Kansas City and Tulsa, overnight lows have seldom dipped much below 80°F, with consistently oppressive humidity. Pulses of tropical air flowing north and east from the Gulf of Mexico are largely to blame.

During the stormy summer of 2005, hurricanes Katrina and Rita raised concerns about the potential effects of global warming on tropical cyclones. At the same time, the Amazon rainforest was experiencing one of its most intense droughts of the last century.

A study led by NCAR visiting scientist Erich Fischer analyzes regional climate simulations to project where heat-wave-related health risks will increase in Europe as Earth’s climate warms.

Students, gardeners, retirees, and other volunteers taking part in a nationwide initiative, Project BudBurst, are finding hints that certain plants are blooming unusually early.