By Tuesday morning, a Colorado low lifts into northeastern Ontario, funnelling a very mild and moist air mass across southern Ontario. Temperatures will be upwards of 8°C-10°C above seasonal with dew points sitting near 20°C by Tuesday afternoon—-highly anomalous for April.
It will feel even a little muggy for those inland, away from the chilly lake influences.
There is the risk for showers and thunderstorms throughout the day, especially in central Ontario and areas around Georgian Bay. Some stronger storms could also develop in parts of northeastern Ontario, but the greatest risk for the worst of the storms appears to be from 3 p.m. to 8 p.m.
The strongest winds will be associated with thunderstorm activity, but a more potent gust risk emerges if storms cluster into a line into the evening hours. Some of the gusts within the storms could become damaging, reaching 100+ km/h.
Heavy, localized downpours are expected but the storms will be moving at more than 60 km/h, diminishing the risk of flooding. Although there’s a lot of moisture in the atmosphere for April, storms won’t see and dump rainfall, as they’ll sweep through quickly.
Large hail between 2-4 cm in diameter is also a concern in the most organized thunderstorms. There will be lots of cool air aloft, with the potential for building strong, sustained updrafts. We could even see hail up to the size of ping pong balls.
