Environment Canada issued a heat warning as well as a thunderstorm watch this morning. It even briefly updated its thunderstorm watch to a "Severe Thunderstorm Warning."\nAlready, tens of thousands of people are without power in the city, as strong winds and torrential rains are making their way through the city.\nTweets and videos show the damaging effect that the storm is already having in the city. Many residents are already feeling the effect of the thunderstorms.\nThunderstorms have already started affecting many areas of the city. According to Hydro-Quebec, residents all over the island and its surrounding areas, especially those towards the west of the island, have experienced outages.\nHydro-Quebec\nOne resident in the West Island told MTLBlog that she has already experienced 2 power outages in the span of an hour.\nThough the power outages may not last long, they can be difficult for those who are affected by the heat warning: namely, pregnant women, children and the elderly. The outages, of course, shut off any A/C units or fans.\nREAD ALSO: Severe Thunderstorm Watch Added To Heat Warning Issued For Montreal\nThe thunderstorm warning is still in effect for Longueuil. A thunderstorm warning is issued when "imminent or occurring thunderstorms are likely to produce or are producing one or more of the following: large hail, damaging winds, torrential rainfall."\nThunderstorm brings down trees, power lines in Montreal and Laval https://t.co/akcnErXPNo pic.twitter.com/hTPbc72VjY— CTV Montreal (@CTVMontreal) July 30, 2019\nEnvironment Canada also warns that Montreal and its surrounding regions may experience very strong wind gusts, hail, heavy rain and even tornadoes.\nView this post on Instagram Enfin de la pluie et des orages #finally #rain #orage #pluie A post shared by Karin Robidoux (@karin_rob_) on Jul 30, 2019 at 11:51am PDT\nMontreal and surrounding areas are under thunderstorm watch, which means that " atmospheric conditions are favourable for the development of thunderstorms that could produce one or more of the following: large hail, damaging winds, torrential rainfall."\nEnvironment Canada warns that people should stay inside if they hear thunder. Hydro Quebec is asking people to be prepared for outages, notably by keeping a list of important numbers, an emergency kit, and flashlights handy.