1. "Unseasonably mild temperatures are spreading over the eastern half of the country and about 75% of the U.S. population will see the temperature climb over 60°F by then end of the weekend, hardly a winter wonderland. Don't be surprised to find holiday shoppers wearing shorts while strolling along Michigan Avenue in Chicago this weekend, as temperatures in the low 60s will make it feel more like late September or early October."

    "Dozens of record highs are likely to be set this weekend across most of the states east of the Mississippi River, including major Northeast metro areas such as New York and Philadelphia. Temperatures up to 30°F above mid-December averages will stretch across the Great Lakes, with double-digit above-normal temperatures stretching all the way down to Florida."

    - CNN, "Where's winter? Record-setting warmth on tap for much of U.S.", December 12, 2015
  2. "The strength and location or 'flavor' of the El Niño event suggests that a very warm 1982-83 or 1997-98 winter is quite possible," said Dr. Todd Crawford, WSI chief meteorologist. "However, there is some risk of big blocking this winter, driven either by a premature weakening and westward shift [toward the dateline] of the El Nino impacts or by just a general tendency for stronger high-latitude blocking. While this blocking potential does add colder risks for the upcoming winter, we are still leaning towards a slightly cooler variation of the very warm 1982 and 1997 strong Nino events."

    - International Business Times, "Why Is It So Warm Winter 2015? Fall Arctic Oscillation To Blame For December Heat Wave", Dec 11, 2015
  3. Possible reason - El Niño?

  4. "Strong El Niños tend to bring warmer than average temperatures to the bulk of the United States during winter, consistent with the pattern we are seeing (along with the stormy Western United States, another result of El Niño)."

    - CNN, "Where's winter? Record-setting warmth on tap for much of U.S.", December 12, 2015
  5. "But there’s no doubt that a powerful El Niño has been helping to shape weather across the globe over the past several months.... The warmer-than-average sea surface temperatures lead to increased evaporation rates, which in turn leads to more warm and moist air rising in the equatorial Pacific. This energizes the subtropical jet stream, which then helps to direct this mild and moisture-laden air toward the U.S. The end result is often a stormy southern tier of the country and fewer intrusions of the polar jet stream diving down from Canada and delivering shots of arctic air. ... the country has been basking in amazingly widespread December warmth."

    - CBS Boston, "Eye On Weather: El Niño A Big Player In Winter Outlook", December 12, 2015
  6. PREVIOUS VERY STRONG El Niño YEARS
  7. "So the one we’re seeing now is peaking earlier than the very strong events of 1982-83 and 1997-98. A weakening trend is expected to continue as we head deeper into winter...
    No two events are the same, and El Niño is not the only factor that goes into the outlook. We can’t say that it has all the answers. But when looking for similar setups (analogs), this one resembles 1982-83 most closely. That season saw a mild November, a very warm (and strikingly similar) December, and ended up with 32.7″ of snow in Boston; 63.4″ in Worcester, and 46.4″ of snow at Bradley International Airport in Windsor Locks, CT. All below average, but not by much. A good portion of that snow came in a huge Northeast blizzard February 10-12th. This kind of idea mirrors our outlook for the 2015-16 season."

    - CBS Boston, "Eye On Weather: El Niño A Big Player In Winter Outlook", December 12, 2015
  8. Other countries?

  9. "일본 열도가 기상 이변으로 몸살을 앓았습니다. 태풍에 맞먹는 강풍으로 항공기 운항이 차질을 빚었고 한겨울 도쿄 기온이 무려 24도까지 치솟는 등 한여름 날씨를 기록했습니다."

    "Japan is suffering unusual weather events. Aviation services experiencing difficulties due to strong wind comparable to Typhoon. Daily max temperature at Tokyo recorded 24'C (75.2'F) high as in summer."

    - YTN, "도쿄 24도 '한여름 날씨'..日 열도 기상이변 속출", Dec 11, 2015
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