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    An extreme cold warning is issued by Environment and Climate Change Canada (ECCC) and the United States' National Weather Service (NWS) to inform the public about active or imminent severe cold temperatures. These warnings are issued when dangerously cold air temperatures or wind chill values are expected or occurring, and people are advised to avoid going outside. The warnings are based on different criteria for each region. For example, an extreme cold warning is currently in effect for Toronto due to frigid temperatures caused by a blast of cold Arctic air.
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