The map below shows the long range forecast of temperatures next week, and the blue and green colors indicate much below normal temperatures. In some ares record low temperatures are expected, along with much lower humidity than we usually see in the middle of summer.
What is going on? Is it the revenge of the polar vortex? Actually, it’s probably connected to Japanese Typhoon Neogori that at one time was packing 150 mph winds. It is moving into southern Japan now, but the global weather models all indicate that it will push a lot of warm and humid air into the high latitudes north of Japan. This will push the jet-stream northward, and the downstream effects will lead to a deep trough over the U.S. Great Lakes next week. (See the upper level wind flow (at around 18,000 feet) for next week below).