US unusually hot AND unusually cold

http://www.wunderground.com/blog/weatherhistorian/comment.html?entrynum=302


The unusually hot weather the southwestern & northwestern coasts have experienced is also in contrast to the uncommonly cold weather th midwest has experienced all summer. Article author Christopher C. Burt writes: "The persistent ridge of high pressure that stagnated over the Eastern Pacific Ocean since last December has been responsible for this sharp contrast in temperature anomalies across the lower 48 states. The system caused the jet stream to flow over the top of the ridge and southward to the east of the high, thus funneling cold air into the central third of the nation."

Liz Epley