that is moving almost straight north, off the western canada coast, a lot of energy in the upper atmosphere is moving northeast ward, up over the big ridge and going to come down the sliding board in to the eastern part of the united states. it's possible that one of the impulses could give us a flurry or two on friday. this is a rotation in the atmosphere. this is the upper area flow and shaded areas where we have areas of rotation in the upper atmosphere. you get rising motion. if moisture is sufficient you get clouds and precipitation on the other side, things sink. the air that is, and things dry out. look at this here , the fact we us now, showing us we have a big trough in the upper atmosphere overhead. it's going to depart later on this evening and overnight. tomorrow, we should have a full day of sun from start to finish, though it's going to be quite cold. here comes the next impulse, down the sliding board here, you can see that it's aimed at