 The heat wave appears to be close to breaking in the Baltimore area. A heat advisory is in effect from 11 a.m. until 8 tonight. Showers and thunderstorms are expected in the afternoon and evening before a cold front moves through the area. Once the extreme heat moves out, highs are expected to be in the upper 80s on Thursday and Friday with lower humidity. And a new economic assessment is highlighting the impact that the Sparrows Point Container Terminal will have on the Maryland economy.