Lably
Skip to content

2011 Halloween nor'easter

Heavy snowstorm that hit Northeast US and Canada in late October that year

  • 13 min read
  • 4 chapters

Related on Lably

Through The Maritimes, Power outage and Massachusetts

The storm arrived just two months after Hurricane Irene caused extensive power outages and property damage in the Northeast; with the 2011 New England tornado outbreak also causing damage in Western Massachusetts. It dumped snow on trees that were often still in leaf, adding extra weight, with the ground in some areas still soft from a preceding warm, rainy period that increased the possibility trees could be uprooted. Trees and branches that collapsed caused considerable damage, particularly to power lines, with estimates of storm costs ranging between $1 billion and $3 billion. In all, 3.2 million U.S. residences and businesses in 12 states experienced power outages, with the storm also impacting three Canadian provinces.

Some customers in Connecticut did not get power back until early November; many outages lasted 11 days. Many communities chose to postpone celebrations of Halloween from two days to a week later as a result, or cancel them entirely. Delays in restoring power led to the resignation of the chief operating officer of Connecticut Light & Power amid widespread criticism of the company's mishandling of both the nor'easter and Irene.

Meteorological history

Early on October 28, 2011, a ridge over Canada advected an unseasonably cold air mass across the Mid-Atlantic states and New England; at the same time, a surface low-pressure area began developing along the coast of Louisiana. A cold front moved eastward from the Ohio Valley and exited the East Coast of the United States, developing another low pressure area off the coast of the Carolinas on October 29. The remnants of Hurricane Rina had also been absorbed into the developing system. At the same time, an area of precipitation extended from South Carolina through Pennsylvania, mostly falling as rain with some snow observed at higher elevations. By late that morning, the system was producing precipitation over much of the Mid-Atlantic and New England.

As the system moved to the northeast through the day, it produced widespread snow and winds near hurricane-strength north of the cyclone's warm front over the open waters of the Atlantic Ocean. Winds as high as 69 mph (111 km/h) were observed in Massachusetts, and the National Weather Service, issued a Hurricane Force Wind Warning for the Gulf of Maine and other high seas off New England. Overnight into October 30, the storm passed south of Nantucket, and it moved over Nova Scotia later that day with a barometric pressure of 975 mb (28.8 inHg). As it did so, the associated precipitation diminished over New England and moved into Atlantic Canada. As the system moved out into the Atlantic Ocean, it reached a minimum barometric pressure of 971 mb (28.7 inHg) as it passed to the east of the island of Newfoundland late on October 31. By the early morning of November 1, the system had fully moved out to sea. The storm then hit the UK as Cyclone Quinn.

Sign in to keep reading

3 more chapters are free with a Lably account.

More in Earth science