A Yellow Weather Warning for extreme heat remains in effect for metro Montreal.
5 PM UPDATE: As expected strong thunderstorm clusters have been developing and wrapping around the northern edge of the high pressure anchored to our south. The first batch went through eastern Ontario around Kingston, prompting tornado warnings. There were reports of trees down and power outages. More storms are expected overnight and Wednesday, some of which will affect southwestern Quebec, especially the western end of the region towards the Ontario border.
Temperatures are warm despite the cloud cover Tuesday, Montreal reached 29C (85F). Humidity levels are on the rise as well, with humidex values in the middle 30s Tuesday, 35C (95F) in Montreal. They will rise to near 40C on Wednesday.
The warm spot in Canada Tuesday afternoon was Windsor, Ontario at 35C (95F), with a humidex of 46C (114.8F)
Previous Posts: Widespread heat warnings and advisories of one form or another stretch across southern Ontario, southwestern Quebec and a large portion of 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.