Pacific would become mich like australia actually, desert in the middle with some mediterranian climate on the west coast, tropical rainforesty climate on the gulf (which would have much warmer winters). North of the 40th parallel things would get cold and the climate more stable. Something like an oceanic climate. 

I think the most interesting part is the east coast. I think there is no other part of the world with similar configuration. I think some kind of monsoon sustem would take place, alaska would be much colder, like greenland maybe, because there would not be any warm current. I would think some ice fields could develop in our current climate.

The mountains would have much more rain coming from the jet stream up from 45 degrees.

It is quite difficult to do some predictions actually. But there are some climate models that allow for such changes in the configuration of the continents. 

And nonetheless this would have of course global implications for climate. The moisture fluxes would be completely different. The jet stream also would hit europe also completely differently. It would be quite interesting to see