The cold shots are more like cool shots. That’s due to the lack of snow and ice in Canada. But notice each cold shot has what are called clippers or clipper systems. Clippers or clipper systems are weak low pressure systems with limited moisture. With repeat clipper passes snow fall can add up.

Cold shot 3 and the moisture over south California could be something.

This is the latest GFS as of writing. The GFS tends to put storms more southeast.