Based on effects of Arctic amplification ( warming ) and ice loss, a study in 2015 concluded that highly amplified jet-stream patterns are occurring more frequently in the past two decades, and that such patterns can not be tied to certain seasons.
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A contorted jet stream pattern is developing over the United States and will cause cool, unsettled weather to stall in both the Northeast and Southwest for the next few days . Strong, slow-moving high pressure at 20, 000 feet over the central states will block the normal west-to-east progression of weather systems.
