As we continue to hold onto hope that summer is here to stay, The Weather Network has announced that all hope for a bright and sunny end of the week is gone. A southern Ontario multi-day thunderstorm is in the forecast this week. So make sure to grab your umbrellas Ontario, because it's about to get gloomy.\nThe Weather Network has announced that another cold front is blasting through Ontario this week that will bring heavy rain, strong winds and even hail to the province. The Weather Network also states that east wind off Lake Ontario will cause temperatures to dip back down next week. In Toronto, temperatures are expected to fall back into the teens at the start of the week.\nThis Thursday, though, conditions are expected to get much worse. The Weather Network warns that if the cold front slows down, the GTA and eastern Ontario will be at risk for severe thunderstorms throughout the day.\nBelow is a map by The Weather Network which indicates where this week's thunderstorm activity will likely hit the hardest:\nThe Weather Network\nThe biggest threats that these storms will bring is strong damaging wind gusts as high as 90km/h in eastern Ontario. As for the Greater Toronto Area, small hail and heavy rainfall are expected.\nThese storms will likely hit the GTA throughout the afternoon and early evening on Thursday. The Weather Network states that it is monitoring the risk closely and will update if the conditions worsen or change.\nTorontonians will get the chance to see a little bit of sunshine on Friday as temperatures climb to the 20s. But, this sunshine won't last long. More thunderstorms are expected on Friday night and into Saturday in the GTA.\nParts of the GTA expect to see up to 15 mm of rainfall by Saturday night. So brace for a wet weekend, Ontario.