Summary Friday will be similar to Thursday: hot, humid with a chance for afternoon and evening thunderstorms. SCHOOL CLOSINGS AND DELAYS | WEATHER MAP | TRAFFIC | HOURLY FORECASTA Severe Thunderstorm Watch is in effect until 9 p.m. Friday across Maryland. Friday will be similar to Thursday: hot, humid with a chance for afternoon and evening thunderstorms. Temperatures will climb into the low to mid 90s, and the heat index will reach the low 100s. There could be a few strong to severe storms capable of damaging wind, some hail and flooding