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2011 Groundhog Day blizzard

2011 blizzard affecting the U.S. and Canada

  • 29 min read
  • 4 chapters
In a winter marked by several crippling storms, the storm of February 1–2, 2011, stands out. Heavy snow, ice, freezing rain, and frigid wind battered about two thirds of the United States, making it “
National Aeronautics and Space Administration · Public domain

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An ice storm ahead of the winter storm's warm front also brought hazardous conditions to much of the American Midwest and New England, and many areas saw well over 1 in (2.5 cm) of ice accumulation. Numerous power outages, flight cancellations, airport closures, road closures, roof collapses, rail and bus cancellations, mail stoppages, and school, government, and business closures took place ahead of and after the storm; many of these disruptions lasted several days. Several tornado touchdowns were reported in Texas and a tornado watch was issued for parts of Alabama, ahead of the cold front in the warm sector of the storm. In addition, thundersnow was recorded at some locations, including downtown Chicago. At least 36 deaths were reported to be related to the storm, many of them in shoveling or auto-related incidents, and the total damages were US $1.8 billion.

Meteorological synopsis

A High-pressure system with a maximum pressure of 1,052 hectopascals (31.1 inHg) moved ahead of the storm, moving eastward across Montana. A low-pressure system from the Pacific Ocean later came ashore over Northern California and crossed the Rocky Mountains, merging with an Alberta clipper low and a developing Texas low, drawing moisture from the northwestern Gulf of Mexico. The storm later intensified and moved northeast, tanked, and developed a long warm front stretching toward the New England states, and moving northeast along this jet stream track.

Lake effect snow events started over Lake Ontario and Lake Michigan from northeasterly winds. Following the predominant jet pattern, the storm developed a very rapid forward trajectory and began to migrate toward the lower Great Lakes. The heaviest snow fell in a wide swath from central Oklahoma to Illinois, Indiana and the Ohio Valley. An official blizzard warning was issued in Southern Ontario for the first time since 1993, although the Canadian definition changed in 2010.

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