Heat that has been building all summer long over the Southwest is about to spread into the Midwest and Northeast for several days from the middle to the latter part of this week, AccuWeather meteorologists say. For parts of the East, temperatures will climb to their highest levels of the year so far. The heat will pale in comparison to the extreme levels experienced in the Southwest in recent weeks. Late July is about the hottest part of the summer based on the historical average for much of the