Southwestern Ontario Canada  is in a yellow-level warning  after a   “long-duration heat event” began Monday. The warning is in effect through to  Friday, and could reach into the weekend with maximum temperatures reaching 36 C. It is  only dropping to 21 to 25 and humidex values are expected to stay between 37 and 45 C. Watch for signs of heat exhaustion.  Environment Canada warns signs include headache, nausea, dizziness, thirst, dark urine and intense fatigue. If any of these signs are present, stop any activities and drink water.  If you are outside make sure to stay hydrated and take lots of breaks. Check any relatives or elderly who are more susceptible to the heat. Heat stroke is a medical emergency, and signs can include red or hot skin, dizziness, nausea,

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