![]() ![]() Above-average temperatures were favored across the southern two-thirds of the contiguous United States and along the east coast, as well as in Hawaii and the northern and western parts of Alaska. Drier conditions were anticipated across the entire southern United States. In terms of precipitation, wetter-than-average conditions were favored across the majority of the northern United States, including a region spanning from the northern Rocky Mountains to the eastern Great Lakes in addition to the Ohio Valley, Hawaii, and western and northern Alaska. He also noted that La Niña years normally result in colder-than-average, wetter winters in the northern tier of the United States and the inverse conditions across the south. According to CPC Deputy Director Mike Halpert, any such La Niña was expected to be "weak and potentially short-lived", but it could still affect the season. The outlook noted a 55–65% chance that a La Niña would develop. On October 19, 2017, the National Oceanic and Atmospheric Administration's Climate Prediction Center released its U.S. Since both definitions span the calendar year, it is possible to have a winter storm in two different years. Winter is often defined by meteorologists to be the three calendar months with the lowest average temperatures. Each definition involves a period of approximately three months, with some variability with both definitions containing two months and a week. Based on the meteorological definition, the first day of winter is December 1 and the last day February 28. Based on the astronomical definition, winter began at the winter solstice, which in 2017 occurred on December 21, and ends at the March equinox, which in 2018 occurred on March 20. While there is no well-agreed-upon date used to indicate the start of winter in the Northern Hemisphere, there are two definitions of winter which may be used. Similar to the previous winter, a La Niña was expected to influence the winter weather across North America. The most intense event, however, was an extremely powerful cyclonic blizzard that impacted the Northeastern United States in the first week of 2018. Finally the winter came to a conclusion with a powerful storm system that caused a tornado outbreak and blizzard in mid-April. In addition, flooding also took place during the month of February in the Central United States. Significant events included rare snowfall in the South, an outbreak of frigid temperatures that affected the United States during the final week of 2017 and early weeks of January, and a series of strong nor'easters that affected the Northeastern United States during the month of March. The 2017–18 North American winter saw weather patterns across North America that were very active, erratic, and protracted, especially near the end of the season, resulting in widespread snow and cold across the continent during the winter. A temperature map of the wide-ranging variable conditions in the United States on February 21, 2018
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