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The extreme cold weather alerts (ECWAs) were examined for Toronto, Canada for the winters of 2004–05 to 2011–12. ECWAs are triggered by extreme cold temperature, wind chill and intense winter precipitation. Just over 40% of the ECWAs occurred when the temperature fell below a −15°C threshold. All but two of the alerts had a wind chill below −15°C. The use of a −10°C threshold captured well the frequency...
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