No Red Flag Warnings.Hot and dry conditions will begin to develop over California today as a ridge of high pressure builds off the Pacific Coast. Cool, dry, and breezy weather can be expected for the northwest as an upper level trough and cold front make their way through the northern Rockies. This will allow cold, Canadian air to sink into Montana and Wyoming with snowfall in the mountains and rain at lower elevations. For the southwest U.S. and central Rockies expect showers and thunderstorms.