Central and southern Indiana continue to experience persistent humidity, with little relief in sight.
Meteorologist Jason Puma with the National Weather Service in Indianapolis said dew points have remained above 60 degrees for much of the season.
Since June 1, Indiana has logged more than 1,060 hours of dew points above 60 degrees—the longest stretch since records began in 1931, according to officials.
“Dew points above 60 degrees show us that we've had very warm and humid and soupy air mass across the area for an extended period of time,” Puma said.
Normally, cooler, drier air from Canada moves through during the summer. But Puma said that hasn’t happened much this year because the jet stream—responsible for directing weather patterns—has stayed well north of the state.
“When the jet is that far north, it allows warm and humid air to continue to reside over Indiana and the Ohio Valley,” he said.
Forecasters say the pattern will continue until there’s a more consistent northerly flow or a shift in the jet stream.
