Lably
Skip to content

Related on Lably

Through North America and Jet stream

The southern portion of the storm produced severe thunderstorms with numerous tornadoes reported. One tornado hit a subdivision of New Orleans that was still recovering from the effects of Hurricane Katrina in August 2005. In total, this storm system was responsible for 37 deaths across 13 U.S. states and Canadian provinces of New Brunswick, Ontario and Quebec. The NOAA classified the storm as a Category 3 "Major" storm. The National Weather Service has determined that this storm was one of the three largest snowstorms to hit the inland areas of the northeastern United States since 1940.

Prior to the storm

In sharp contrast to the mostly mild weather in the first few weeks of winter, the eastern half of the continent was under the influence of cold temperatures. Numerous areas had substantial snowfall deficits before this storm. After several weak Alberta clippers crossed the eastern half of the continent and brought occasional light snowfalls, a large dip in the Northern branch of the jet stream favored a more active pattern, which, as it connected with the southern branch, led to the development of the storm.

An area of low pressure tracked across southeastern Canada during the 12th, which brought an arctic front across the Mid Atlantic region late on the 12th. As this occurred, a strong area of high pressure located across central Canada built down into the Northeast, allowing very cold air to spill southward ultimately leading to what is known as cold air damming. This occurs east of the mountains down through the Mid Atlantic states. Meanwhile, a Pacific storm slammed onto the California coast during the 11th and as it moved eastward, a new area of low pressure developed across southeastern Colorado and the Texas Panhandle.

Previously, portions of the Great Lakes were hit by a significant lake effect snow event which dumped incredible amounts of snow over portions of central New York. Several areas received over 115 inches (2,900 mm) of snow in a ten-day period just before the large winter storm as northwesterly winds and unfrozen lake surfaces due to the early winter warm weather favored the heavy snowfall. Several areas across Michigan and Ontario also received significant amounts of snow with locally 1 metre (3 ft 3 in) of snow east of Georgian Bay in Ontario.

Sign in to keep reading

4 more chapters are free with a Lably account.

More in Earth science