Unless I miscalculated, the NWS heat index at BWI Airport was 117° when I was unloading the car (the hotel is in sight of the airport). I thought it was extremely hot. Given the fact that we are nearly at sea level makes it worse (more atmosphere pressing down).
The hotel has put complimentary water and lemonade in the lobby which is very much appreciated.
UPDATE: Baltimore's Fox 45 is reporting the downtown Baltimore/Inner Harbor heat index was 125° at 1pm. That is the highest heat index I have ever seen -- anywhere. The 10pm heat index is still 108°!
PLEASE take it easy in this heat. If you have to be outside, drink water plus something like Gatorade.