NOAA refers to the "notion that the climate is changing towards warmer"

Heat Wave Sweeps US; NOAA Says Spring Flood Risk Low - ABC News

NOAA managers said they cannot say for certain if the rising heat index is connected to global climate change.

“Extreme events like the ones that we’re seeing are consistent with the notion that the climate is changing towards warmer, and obviously when records are broken that’s an unprecedented event, but without a lot of research and study it’s impossible to connect any single event with climate change,” said Ed O’Lenic, chief of the operations branch at NOAA’s Climate Prediction Center.