There are a lot of small to medium sized towns in Pennsylvania in our system, and Altoona happens to be one of them. Altoona is about as close as we get to right in the middle of the state.

At 353PM, ET, Altoona was reporting clear skies with a temperature of 72. Altoona very clearly found itself on the warm side of a boundary that will bring much more autumnal temperatures to the region over the next few days. It was demarcated quite clearly on satellite, running through southern Ontario, just north of the eastern Great Lakes.
The boundary is not laden with moisture, and the Appalachians and Eastern Seaboard aren’t moisture rich, so as the boundary passes, it will be without fanfare. High pressure will quickly return, along with another ridge. The cool down will continue through Halloween, but won’t last much longer than that.
Tomorrow – Mostly cloudy, High 62, Low 46
Halloween – Clearer and cooler, High 57, Low 38

TWC: Tomorrow – Some clouds in the morning will give way to mainly sunny skies for the afternoon. Warm. High 62, Low 48
Halloween – Partly cloudy. High 60, Low 37

AW: Tomorrow – Sunny to partly cloudy, breezy and cooler; low humidity and dry brush will result in an elevated fire threat High 64, Low 46
Halloween – Some sunshine giving way to clouds; a beautiful start to the weekend High 60, Low 37

NWS: Tomorrow – Mostly sunny, High 67, Low 47
Halloween – Mostly sunny, High 62, Low 35

WB: Tomorrow – Mostly sunny. High 63, Low 47
Halloween – Mostly sunny. High 59, Low 38

WN: Tomorrow – Mostly cloudy, High 67, Low 49
Halloween – Partly cloudy, High 62, Low 35

CLI: Tomorrow – Sunny, High 61, Low 43
Halloween – Sunny, High 58, Low 36

Satellite is showing that thatch of clouds over Southern Ontario. It will bring “weather” to Altoona, but it will make things a bit chillier.