As posted on BirdChat-
We are experiencing the biggest winter finch irruption since the
"superflight" of 1997-1998, when many boreal finches went well beyond
their normal ranges. The cause is the largest tree seed crop failure
in a decade across more than 3200 km (2000 mi) of boreal forest from
Saskatchewan into Quebec. Today in Toronto, I had a Pine Grosbeak,
Evening Grosbeaks, Common Redpolls, Pine Siskins and Purple Finches
migrating along the shoreline of Lake Ontario. Boreal winter finches
are being reported in many areas of southern Ontario and the United
States, where some species such as Pine and Evening Grosbeaks haven't
been seen in years. There is no telling how far south this
"superflight" will go.
Winter Finch Forecast 2007-2008 is stored at two sites.
http://ca.geocities.com/larry.neily AT rogers.com/pittaway-new.htm
This is definitely true in Pennsylvania as Pine Siskins and Purple Finches are being seen at feeders across the state, quite a few redpolls have been seen and heard and reports of Evening Grosbeaks are coming from most of the state. Get those feeders out and fill them!