Two weather systems to talk about today. A pacific weather system and a southern system. The southern system can be seen in old Mexico. The Gulf of Alaska weather system moves into the picture as well across the pacific northwest west. Here is the problem, with the moisture from the south it will warm the upper levels of the atmosphere first. A shallow area of cold air sits at the surface and this sets up well for a period of freezing rain overnight Tuesday and into Wednesday.
It gets colder:
By Thursday morning it looks like some cold air is back into the picture with -15 Celsius air at 850 mb. This is short lived as more moderate air comes into the picture by Friday.
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