Cool weather will continue Thursday, and there is a chance we may see some precipitation in the afternoon. There is considerable uncertainty, but enough of a chance to include the precipitation in the forecast. The moisture is contained in an atmospheric river, coming all the way from Hawaii. We're quite certain it will produce heavy snow in the mountains, including Highway 93 between Banff and Jasper. How much of that moisture moves east of the Rockies is a matter of doubt. To further complicate matters, the precipitation could take up to three forms. It may begin with a brief bout of rain, changing to freezing rain, then to snow. It it happens in Calgary, it will be mild enough for accumulations to be minimal. Warm westerlies will follow on Friday, giving us a big temperature boost. It may not be as warm on Halloween, but we're looking at a sunny, dry day before trick or treating time. In the early evening, the sky should be mainly clear, with a temperature near zero, so the costumes will have to be reinforced with warmer winter wear. The westerlies return Sunday, and, combined with an upper ridge of high pressure, they should give us several days of double digit warmth!
Wednesday night: Cloudy, low 1 Thursday: Cloudy. Chance of rain in the afternoon turning to snow, high 4 Friday: Mainly sunny, high 10 Saturday: Sunny, high 4 Sunday: Sunny, high 10 Monday: Sunny, high 14