 And the National Weather Service has a heat advisory in effect from 11 a.m. until 8 p.m. across the D.C. area. There's also an excessive heat warning posted in Anne Arundel, St. Mary's, and Calvert counties from 11 a.m. to 8 p.m. There's been a surge in the number of complaints against Maryland's largest school system. In the past 12 months, the county's inspector general received nine times as many complaints about Montgomery County schools than it did last year.