Where the forecast has changed is that a second low pressure system is now expected to form over Southwestern Canada on Friday, slowly moving eastward through the weekend. A warm front will be present, extending to the Southeast from the center of the low, and passing through the region from the West. Winds will shift to the Southwest, resulting in slightly warmer temperatures than Friday. A chance for more scattered showers is possible along the front, however timing looks to be closer to the afternoon to evening.
For Sunday, winds will shift back to the North/Northeast as high pressure builds in, resulting in more below average temperatures with partly cloudy conditions. Fog may be possible in the early morning, but will disperse after sunrise.