It’s always tough to try and create a forecast when the main weather maker is still unfolding. The dominant weather feature to start this forecast period will be the strong area of low pressure moving through Manitoba into Ontario.
By Wednesday, the low should be to our east and we should see very strong northerly winds behind the departing low. Eastern areas will likely stay warm enough that they should continue to see rain or showers on Wednesday. Farther west, it looks like enough cold air will work its way southward for the precipitation to turn into snow. Overnight Wednesday and into the day on Thursday, most regions will see some snow. The question is whether there will be enough snow to overcome the warm ground to allow for any accumulations.
Once this storm system finally moves out by late Thursday, we will see a couple of cool days as a weak ridge of high pressure tries to establish itself over our region. Depending on the amount of sun we get, highs over the weekend will warm a bit and should be in the 5 C to 8 C range, with overnight lows around -3 C to -6 C. Halloween currently looks as if it will be dry and fairly pleasant, with light winds and clear to partly cloudy skies.
Looking ahead to the start of next week, the weather models bring in a chance for some showers on Monday, as a trough of low pressure passes through. Temperatures will be fairly mild with this trough, so no snow is expected. Once the trough passes by, a ridge of high pressure will attempt to re-establish itself to our south. This, combined with low pressure to our west and north, should result in fairly mild temperatures. So it currently looks like winter will hold off for a little while yet.
Usual temperature range for this period: Highs:0 to 11 C.Lows:-9 to 1 C.
Chance of precipitation falling as snow: 65 per cent.