 One more exceptionally hot and humid day before a little bit of relief arrives tomorrow and Friday. This afternoon, though, we're topping out in the mid-90s with heat index values between 105 and 110. This evening, tracking a line of gusty showers and storms, probably in the D.C. metro area between about 8 and 9 p.m. Could see some downpours, damaging wind gusts, and with such high humidity, frequent thunder and lightning.