Friday looks like a beautiful day with sunny skies and comfortable temperatures as high pressure builds in at the surface and through the upper levels of the atmosphere. The high pressure ridge will continue to shift slowly east across Ontario through Saturday, and temperatures are expected to warm into the lower 80s F (upper 20s C).
As we get into Sunday, the forecast uncertainty rises considerably. The models agree on a low pressure system approaching from the west, but they are very different with their timing. The consensus seems to be that most of the rain will come Sunday night, but a few are quicker to bring the rain in. I'm going to trend the forecast toward the slower timing by lowering the chance of rain slightly, and moving the rain chance into the afternoon. With the expected slower arrival of the rain chances, I've raised Sunday's high temperature into the lower 80s F (upper 20s C).
Our live radar feed will be available in the TUSC Radar link at the top of the page, and I'll have updates posted on my Twitter account @Race4caster.