Highs in the mid-90s with high humidity and afternoon thunderstorm chances were forecast Tuesday in the Baltimore area, according to the National Weather Service.
Overnight lows were forecast in the mid-70s to start the morning. With partly cloudy skies, sunshine was expected to quickly raise the heat.
Dew points are forecast in the upper 60s, an uncomfortable level for most people. The heat and humidity could fuel afternoon thunderstorms.
A "Code Orange" air quality alert is in effect for the Baltimore region, with pollution levels considered unhealthy for children, the elderly and those with respiratory, heart and other health conditions.
Highs Wednesday are forecast in the upper 90s, with lows in the upper 70s, and with humidity bringing the heat index to more than 100 degrees. Thunderstorms are again possible.
Thursday could hit the mid-90s, with more storm chances.
Temperatures could fall back into the mid- to upper 80s Friday and Saturday.