WINDSOR, ONT. Windsor-Essex is under a heat warning for the next two days prompting the City of Windsor to open temporary cool shelters. The decision made my Dr. Wajid Ahmed, medical officer of health for the Windsor-Essex County Health Unit based on projections by Environment Canada. A heat warning is issued when two consecutive days are forecasted to have a daytime high temperature greater than or equal to 31°C and overnight temperatures greater than or equal to 21°C or a humidex of 42 or greater. The City of Windsor is opening a temporary cooling centre for residents unable to find relief from the heat at home or by using one of the seven city splash pads.