My research indicates that the Sept 23-25 period is the beginning of peak fall rarity season for fall birders. It tends to go until (roughly) Nov 7-10... Obviously the whole fall can turn up spectacular birds, but this is really the period when numerous rarities are found..
I actually noticed it was happening recently when surfing for rarity photos from nearby states/provinces:
Purple Gallinule in Quebec:
http://www.quebecoiseaux.org/components/com_oiseauxrares/images/or_pictures/1316570550.jpg
Says' Phoebe in Quebec (#1 of three I think!? If only I paid attention in french class!)
http://www.quebecoiseaux.org/components/com_oiseauxrares/images/or_pictures/1315788821.jpg
Quebec Says (2 of 3?)
http://www.quebecoiseaux.org/components/com_oiseauxrares/images/or_pictures/1315695999.jpg
(also a Say's Phoebe in NJ)
Smith's Longspur on Lake MI (IL)
http://www.flickr.com/photos/86416619@N00/6169739822/in/pool-ebird
Another Smith's Longspur at Whitefish Point, MI
http://www.surfbirds.com/media/gallery_photos/20110909094810.jpg
Black-headed Gull in Ohio (Lake Erie) - Laughing gull seen the same time/spot
http://www.flickr.com/photos/11806338@N03/6164509933/in/pool-437129@N20/
Franklin's Gull on Lake Superior
http://www.flickr.com/photos/cochon/6164507093/in/pool-437129@N20/
A little out of range, but very exciting: Violet Green Swallow in NJ
http://www.flickr.com/photos/bonxie88/6163903923/in/pool-437129@N20/
Oh and quebec has now had breeding Eurasian Collared Doves before us!:
http://www.quebecoiseaux.org/components/com_oiseauxrares/images/or_pictures/1316311419.jpg
--- And these are just the photos! Lots of other good birds are showing up (including Ontario - Presqu'ile has been on fire!)
With each violent weather system that passes, more rarities will show up! Keep on lookin!
Looking forward to some good fall birds!
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