The Alberta clipper involves a relatively low-amount snow system that originates in the Canadian province of Alberta and swings down into the US, leaving howling winds and biting cold in its wake. The clipper system is moisture-starved, leading to its usual 2-5'' snowfalls it puts down. This winter, I anticipate the Alberta Clipper to be a little less prevalent than usual, but due to a still-unknown pattern just offshore of Canada, confidence in that outlook is low.
The Colorado Low is a storm system that originates from the West US and passes in or close to Colorado, depending on its eventual track downstream. The Colorado Low then moves northeast, and can bring rather significant snows to the Plains, Midwest, Great Lakes and even the Ohio Valley. This winter, I expect we will see more Colorado Lows than usual, as ridging in the West and a stormy pattern offshore the Southwest should lead to a more active storm track.
The Panhandle Hook is essentially the motherlode storm system for the Midwest and Plains. It comes from the West US and does a hook around Oklahoma (hence the PANHANDLE Hook) before coming north and east. The Panhandle Hook is relatively rare, but when it happens, under the right conditions, over a foot of snow can hit areas affected by this system. I anticipate an above normal number of Panhandle Hook systems, as stormy conditions are expected in the region where Panhandle Hook systems originate.
The Nor'easter is quite possibly the most intense winter storm that can hit the United States. Its cousin, the Panhandle Hook, will be rather active this winter, and it's no surprise that the Nor'easter should be either normal or slightly above normal for this winter as well. It will depend on the presence (or lack) of ridging in the Southeast, which, if it were to be present, would discourage Nor'easters. I'm not sure which way I'll lean as far as if these storms will be normal or above normal. That should become clearer by October.