Cool weather outbreak warning

Still wondering if you should head south since the fall weather is nice and warm in your area?  Take a look at these two temperature forecast maps.  First, the one for this coming Monday afternoon (Oct 22):

Still pretty balmy over much of the country.  Now, check out this forecast map for seven days later (same time of day, but for Oct 29):

Notice the blue colors invading the northern half of the U.S.?  That's a cold air invasion from Canada just before Halloween, and given the time of day for this graphic (18Z, or 2:00 p.m. EDT) this is a good representation of the high temperature for that day. 

Our nice warm autumn weather pattern appears as if it could quickly shift into one resembling more of a winter look.  But, look at the Florida panhandle...still showing high temperatures near 70 degrees even after the cold air intrusion.  Casablanca at 30A sounds like the place to be if you want to keep enjoying warm weather this fall!