 TSA expects to screen more than 3 million people on Friday. That would break the record that was set last Sunday. Neil Loggenstein, WTOP News. Another stretch of stifling 90-plus degree weather is arriving just in time for the long holiday weekend. Things are really expected to ramp up tomorrow, and WTOP's John Doman spoke with an expert about the toll repeated heat waves take on your body. We know a lot more about the short-term impact.