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A blizzard is a severe snowstorm characterized by strong sustained winds and low visibility, lasting for a prolonged period of time—typically at least three or four hours. A ground blizzard is a weather condition where snow is not falling but loose snow on the ground is lifted and blown by strong winds. Blizzards can have an immense size and usually stretch to hundreds or thousands of kilometres.
The Northeast Snowfall Impact Scale (NESIS) was created to measure snowstorms in the U.S. Northeast in much the same way the Saffir-Simpson Hurricane Scale records hurricane intensity and the Enhanced Fujita Scale with tornadoes.
The Great Appalachian Storm of November 1950 was a large extratropical cyclone which moved through the Eastern United States, causing blizzard conditions along the western slopes of the Appalachian Mountains and significant winds and heavy rainfall east of the mountains. Hurricane-force winds, peaking at 110 miles per hour (180 km/h) in Concord, New Hampshire, and 160 mph (260 km/h) in the highlands of New England, disrupted power to 1 million customers during the event.
The New Year's Eve 1963 snowstorm was a significant winter storm occurring from December 31, 1963 to January 1, 1964 over most of the Southern United States. The storm began when a surface low-pressure system moved northward through the eastern Gulf of Mexico and up the Fall Line east of the Appalachians, leading to a snowstorm from the central Gulf coast northward into Tennessee. Three people perished during the storm, and travel was severely restricted for a couple of days following the snowfall. The strong winds accompanied by heavy snow fall set historic new snowfall records in Alabama.
The December 2000 nor'easter was a significant winter storm that impacted the Mid-Atlantic and New England regions of the United States around the end of the month. It began as an Alberta clipper that moved southeastward through the central United States and weakened over the Ohio Valley. However, it redeveloped off the coast of North Carolina and moved northward as it intensified. It moved into central Long Island and eventually tracked northward into New England. The storm dropped heavy precipitation throughout the Northeast, especially in northern New Jersey and eastern New York, where snowfall often exceeded 2 ft (0.61 m). Even so, as it struck on a weekend, its effects were generally minor and mostly limited to travel delays, traffic accidents, and business closures.
The February 1995 nor'easter was a significant nor'easter that impacted the Mid-Atlantic and New England regions of the United States around the beginning of the month. It was the only major nor'easter of the 1994–1995 winter.
The February 1987 nor'easter was a significant winter storm in the US that impacted the Mid-Atlantic States around the end of the month. It delivered 8–12 hours of heavy, wet snowfall to several states from West Virginia to New York between February 22 and February 24. The storm was both preceded and followed by relatively warm temperatures, causing the snow to rapidly melt. The mild conditions were the result of a moderate anticyclone over the region that deteriorated as the nor'easter approached. Cold air damming likely took place prior to the storm's formation.
The February 1969 nor'easter was a severe winter storm that affected the Mid-Atlantic and New England regions of the United States between February 8 and February 10. The nor'easter dropped paralyzing snowfall, exceeding 20 in (51 cm) in many places. New York City bore the brunt of the storm, suffering extensive disruption. Thousands of travelers became stranded on roads and in airports. The storm killed at least 94 people. City schools were closed for several days and some areas of the city remained uncleared for over a week. New York Mayor John Lindsay was criticized for failing to respond to the snowstorm adequately.
The March 18–20, 1956 nor'easter was a significant winter storm in the United States that affected the Mid-Atlantic States and southern New England. The storm ranked as Category 1, or "notable", on the Northeast Snowfall Impact Scale. A high-pressure area north of New York State, developing in the wake of another system on March 15–16, provided cold air for the snowfall. It was among a series of snowstorms to affect the region during the month.
The March 18–21, 1958 nor'easter was an unusual late-season winter storm that impacted the Mid-Atlantic and New England regions of the United States. Its snowfall extended from North Carolina through Maine.
The February 1952 nor'easter was a significant winter storm that impacted the New England region of the United States. The storm ranked as Category 1, or "notable", on the Northeast Snowfall Impact Scale. Its rapid intensification resulted in heavy snowfall between February 17 and 18, accumulating to 12 to 30 inches. High winds also affected central and northern New England. The nor'easter is estimated to have caused 42 fatalities. In Maine, over 1,000 travelers became stranded on roadways. Two ships cracked in two offshore New England during the storm.
The January 1961 nor'easter was a significant winter storm that impacted the Mid-Atlantic and New England regions of the United States. It was the second of three major snowstorms during the 1960–1961 winter. The storm ranked as Category 3, or "major", on the Northeast Snowfall Impact Scale.
The December 1960 nor'easter was a significant early-season winter storm that impacted the Mid-Atlantic and New England regions of the United States. Moderate to heavy snowfall fell from West Virginia to eastern Maine, amounting to 10 in (25 cm) or more in parts of 13 states and peaking at 21.4 in (54 cm) at Newark, New Jersey. The storm was accompanied by strong winds, gusting to over 90 mph (140 km/h) in coastal New England, and left in its wake a dangerously cold air mass. The storm originated in a weak low pressure area which formed over the western Gulf of Mexico on December 10. A secondary low developed over South Carolina on the next day, supported by the merger of two troughs aloft. Sliding southeast of New England, the new storm explosively deepened to become a full-fledged nor'easter, with a minimum central air pressure of 966 mbar. It began to weaken over the Canadian Maritimes.
The March 1960 nor'easter was a severe winter storm that impacted the Mid-Atlantic and New England regions of the United States. The storm ranked as Category 4, or "crippling", on the Northeast Snowfall Impact Scale. Northeasterly flow, combined with the storm's slower forward motion, enhanced snowfall across the region. The cyclone began moving away from the United States on March 5. It took place during a stormy period in the affected region, contributing to record snowfall.
The December 1969 nor'easter was a strong winter storm that mainly affected the Northeastern United States and southern Quebec between December 25 and December 28, 1969. The multi-faceted storm system included a tornado outbreak, record snow accumulations, a damaging ice storm, and flooding rains.
The February 2013 North American blizzard, also known as Winter Storm Nemo and the Blizzard of 2013, was a powerful blizzard that developed from the combination of two areas of low pressure, primarily affecting the Northeastern United States and parts of Canada, causing heavy snowfall and hurricane-force winds. The storm crossed the Atlantic Ocean, affecting Ireland and the United Kingdom. The nor'easter's effects in the United States received a Category 3 rank on the Northeast Snowfall Impact Scale, classifying it as a "Major" Winter Storm.
The 2011–12 North American winter by and large saw above normal average temperatures across North America, with the Contiguous United States encountering its fourth-warmest winter on record, along with an unusually low number of significant winter precipitation events. The primary outlier was Alaska, parts of which experienced their coldest January on record.
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. 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. In addition, flooding also took place during the month of February in the Central United States. Finally the winter came to a conclusion with a powerful storm system that caused a tornado outbreak and blizzard in mid-April. The most intense event, however, was an extremely powerful cyclonic blizzard that impacted the Northeastern United States in the first week of 2018. Similar to the previous winter, a La Niña was expected to influence the winter weather across North America.
The February 15–20, 2021 North American winter storm, also unofficially referred to as Winter Storm Viola, was a significant and widespread snow and ice storm across much of the United States, Northern Mexico, and Southern Canada. The system started out as a winter storm on the West Coast of the United States on February 15, later moving southeast into the Southern Plains and Deep South from February 16–17. It then moved into the Appalachian Mountains and Northeastern United States, before finally moving out to sea on February 20. The storm subsequently became a powerful low pressure system over the North Atlantic, before eventually dissipating on February 26.
References
- ↑ Harriet Loeb (February 2, 2009). "Paul Kocin: A Person for One Season". National Oceanic and Atmospheric Administration. Retrieved February 6, 2010.
- ↑ Patrick O'Driscoll (January 31, 2006). "Storm ranking system starts; Snow categories similar to those for hurricanes". USA Today. Retrieved February 6, 2010.
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