Extreme cold warning

An extreme cold warning is issued by Environment Canada to inform the public about cold temperatures in their region that are expected to last for at least two hours.

As of April 8, 2014, Environment Canada replaced the Wind Chill Warning with an Extreme Cold Warning. In the older system a wind chill warning for Southern Ontario and Atlantic Canada was issued when the wind chill dropped to -35. Thus a temperature of −37 °C (−35 °F) with no winds would not require a warning be issued. Under the new system the extreme cold warning is issued based on either the temperature or the wind chill being a certain value for at least two hours. The values range from −30 °C (−22 °F) in the south to −55 °C (−67 °F) in parts of the Arctic.

In the United States an extreme cold warning was an experimental weather warning issued by the National Weather Service in North Dakota, South Dakota, and Minnesota. The warning was issued if the temperature fell to −35 °F (−37 °C) or colder with a wind of less than 5 mph (8 km/h; 2 m/s). It was an experimental advisory for when the air temperature was dangerously cold, but the wind was too little to warrant a Wind Chill Watch or Warning.

The Extreme Cold Warning was used from January 10, 2011 to April 15, 2011. It was discontinued beginning with the 2011-12 winter storm season. Only four Extreme Cold Warnings were issued: one for Burleigh County, and three for areas outside of the Bismarck-Mandan metropolitan area.

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Wikipedia