A prolonged period of very cold wind chills is expected.What:Wind chill values near minus 40.When:Continuing through this morning, possibly returning tonight into Monday morning for some areas. Additional information:Very cold temperatures are occurring this morning across portions of northern Ontario, particularly in areas that remained clear during the night. Wind chills approaching minus 40 are possible again tonight into Monday morning for some locations.These very cold temperatures are expected to moderate somewhat on Monday, although below normal temperatures are expected for much of the upcoming week.###Extreme cold puts everyone at risk.Risks are greater for young children, older adults, people with chronic illnesses, people working or exercising outdoors, and those without proper shelter.Watch for cold related symptoms: shortness of breath, chest pain, muscle pain and weakness, numbness and colour change in fingers and toes.Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm.For more information about the alerting program, please visit: https://www.canada.ca/en/services/environment/weather/severeweather/weather-alerts/colour-coded-alerts.