With temperatures skyrocketing into the 100s over the next couple of days, the D.C. area will be close to breaking some records. Oddly enough, there doesn't appear to be any clear-cut record breaking highs looming besides at Dulles, as their climate record is a lot shorter than BWI Marshall and Reagan National.
July 22 and 23 appear to be the days with the highest likelihood of broken records. With highs expected to reach the 100 degree mark Thursday through Saturday, that should be enough to at least tie a few area records. The oldest records are on July 22, with Reagan's set in 1926 and BWI's set in 1957. The newest records are from just last year at each airport on the 24th which would be Sunday if the heat holds that long.
Your objective over the next couple of days: Stay Inside! Heat is extremely dangerous and is the number one weather-related killer in the United States. It has already taken 22 lives in the Midwest and Plains states this past week and has the potential to take more as it moves eastward. Individuals particularly prone to the heat are the elderly and young children. Also don't forget about your pets and be sure to never leave anyone inside a closed vehicle.
The combination of heat and humidity will make it feel like it is in the 110 degree range, which is very dangerous to be outdoors in. Know the symptoms of heat illnesses and be sure to be safe and take it easy if you must be outside.