Temperatures surged to at least 93 degrees at Baltimore-Washington International Thurgood Marshall Airport and 95 degrees downtown Thursday afternoon, the hottest marks at either location so far this year.
The airport had hit 91 degrees May 28, while a thermometer at the Maryland Science Center in the Inner Harbor twice hit 90 degrees in late May. Thursday was the first 90-degree day in June, and thus the first of meteorological summer, for both locations.
Humidity was meanwhile at some of its highest levels of the year. Dew points surged as high as 68 degrees at BWI on Thursday afternoon, putting the heat index into the mid-90s.
More heat and humidity is ahead. Highs are forecast in the lower- to mid-90s Friday and Saturday, and humidity is expected to go even higher, with dew points hitting 70 degrees.
The heat and sunshine were helping to create poor air quality. A "Code Orange" alert, meaning air pollution is unhealthy for sensitive groups, was in effect Thursday and likely will again be in place Friday.