Significant warmth across the US next week, but will it last?
The hemispheric pattern evolution over the next 7-10 days will be quite intricate, to say the least, and could potentially include both a significant — possibly record breaking — warmup, and a large scale cooldown directly behind it. The pattern changes and evolution are being largely driven by changes that are ongoing in the Pacific Ocean, as a large low pressure system and mid level trough form in the Gulf of Alaska. This forces dramatic changes to the pattern across the Continental United States.
Late this week, a large trough centered near the Aleutian Islands of Alaska will begin a dramatic shift. This trough — overall — has been centered near the Aleutians for quite some time now. But a changing pattern, wavelengths, and an extra boost from a recurving typhoon will help to bring forth the change. The Aleutians trough shifts southeast by hundreds of miles this weekend, resulting in a significant storm system pushing into the Pacific Northwest.
