109-Degree Heat Index, High Humidity Draw Warning In MD

MARYLAND — The heat index could top 100 degrees Friday and Saturday in Maryland. The National Weather Service issued a heat advisory as high humidity bakes the state.

It could feel like 109 degrees Friday and 104 degrees Saturday. Real temperatures will be 98 degrees and 95 degrees, respectively.

There's a chance of thunderstorms both nights, which could complicate weekend fireworks schedules.

"Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors," the National Weather Service said in its heat advisory. "Young children and pets should never be left unattended in vehicles under any circumstances."

Meteorologists warned that the steamy conditions could cause heat-related illness.

"Take extra precautions if you work or spend time outside," the advisory said. "When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke."

The advisory lasts from noon to 8 p.m. Friday. It covers portions of central, north central, northeast and northern Maryland, the District of Columbia and central, northern and northwest Virginia.

"Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1."

Here is the National Weather Service's seven-day forecast at Baltimore/Washington International Thurgood Marshall Airport:

Friday: Mostly sunny and hot, with a high near 98. Heat index values as high as 107. Southwest wind around 6 mph.

Friday Night: Scattered showers and thunderstorms between 8pm and 2am, then isolated showers. Mostly cloudy, with a low around 79. Southwest wind 3 to 6 mph. Chance of precipitation is 30%.

Saturday: Isolated showers, then scattered showers and thunderstorms after 11am. Partly sunny, with a high near 95. Heat index values as high as 104. Southwest wind 5 to 7 mph. Chance of precipitation is 40%.

Saturday Night: Scattered showers and thunderstorms, mainly before 11pm. Mostly cloudy, with a low around 73. South wind around 6 mph becoming light and variable after midnight. Chance of precipitation is 40%.

Sunday: Partly sunny, with a high near 94. Northwest wind around 6 mph.

Sunday Night: Partly cloudy, with a low around 74.

Monday: Partly sunny, with a high near 94.

Monday Night: Mostly cloudy, with a low around 74.

Tuesday: A chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 92. Chance of precipitation is 50%.

Tuesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Chance of precipitation is 50%.

Wednesday: A chance of showers and thunderstorms. Partly sunny, with a high near 91. Chance of precipitation is 40%.

Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Chance of precipitation is 40%.

Thursday: A chance of showers. Partly sunny, with a high near 90. Chance of precipitation is 40%.