 Those storms are predicted to be strong. The main concern with those storms will be downpours, localized flooding, damaging winds, and even some hail. To the D.C. area, an excessive heat warning is currently in effect for the entire D.C. region. It began at 11 a.m. this morning and runs until 8 p.m. tonight. Today's warning is quote for dangerously hot conditions with heat index values around 110 degrees expected.