A Yellow Weather Warning for extreme heat is in effect for metro Montreal.
In fact, heat warnings and advisories of some form stretch across southern Ontario, southwestern Quebec and a large portion the Untied States, east of the Mississippi River.
Strong high pressure over the southern US is pushing a very warm and moist air mass into our region. Temperatures will rise into the low and middle 30s for some locations, with elevated humidity levels, especially Wednesday and Thursday resulting in humidex (real feel) temperatures over 40C (104F). Humidex values represent the combination or heat and humidity, elevated values make it difficult for the body to evaporate sweat, making us feel extremely uncomfortable and lowering our ability to cool down.
Extreme heat can be a killer. Watch for heat exhaustion and heat stroke. Know the difference between the two, and most importantly know how to respond. Always stay hydrated.
National Weather Service
The reminders are the same with this kind of heat, drink plenty of water, refrain form strenuous outdoor activities, especially during the afternoon hours. Try to spend some time in air conditioned spaces if possible. The most simple advice is often the most difficult for some to follow, under no circumstances, none, do you leave pets or children unattended in vehicles.
If you have plans to move on July 1st, as many do in Montreal, plan for very uncomfortable and at times dangerous conditions. Drink plenty of water, avoid alcohol, pizza is ok 🙂 and take frequent breaks.
Little relief is expected overnight, with temperatures remaining very warm in Montreal, in the middle 20s (70s F). The cumulative effect of a few days of extreme heat is often what leads to health issues.
There is a chance of some strong thunderstorms late each day as disturbances in the atmosphere ride along the northern edge of the high pressure ridge. The first risk arrives Tuesday afternoon. Some of the storms may be severe, with high wind gusts and torrential rainfall.
Relief may arrive by Saturday as a cold front moves southeast from western Canada. The timing is not clear at the moment, but temperatures should cool slightly by Sunday.