http://news.yahoo.com/heat-dome-trap...093241732.html

Much of the United States is trapped under a heat "dome" caused by a huge area of high pressure that's compressing hot, moist air beneath it, leading to miserable temperatures in the mid-90s to low 100s and heat-index levels well above 100 degrees
Heat dome? Never heard of that before.

But relief is on the way. Cooler air should begin moving into the Plains states this weekend, as a strong pool of air from the jet stream begins to push hot air out of the way in the Dakotas and into Minnesota before making its way east. By Monday, temperatures will drop into the mid-80s in the north,