1st Frost for Parts of Philadelphia Region Ahead of Summer-Like Temps - NBC 10 Philadelphia

1st Frost for Parts of Philadelphia Region Ahead of Summer-Like Temps

First Alert Weather: Frost Advisory Overnight

A frost advisory will be in effect for early Saturday morning. The forecast looks sunny and mild for the rest of weekend. (Published Friday, Oct. 14, 2016)

A frosty start to the weekend as parts of the greater Philadelphia region possibly deal with the first frost of the season Saturday.

After a chilly start to Friday as a cold front pushed eastward off the east coast a great day could be expected with mild winds, plenty of sunshine and comfortable temps (mid-60s). But get ready for another chilly night and chilly morning Saturday.

We do have all the ingredients needed for frost, and if you recall NBC10 First Alert Weather Team made note of this likely frost Thursday. Here's why we called for that frost: calm winds, a clear sky and a few other technical factors. Anyhow long story short, we have a Frost Advisory starting at 1 a.m. until 9 a.m. Saturday for parts of Bucks, Chester, Montgomery, Berks, Lehigh and Northampton counties in Pennsylvania and Atlantic, Burlington, Cumberland and Ocean counties in New Jersey. The frost will be the first for neighborhoods outside of the Lehigh Valley.

Photo credit: National Weather Service

Friday brings us lots of sunshine and that's the trend through the weekend. Building clouds late Sunday and possible scattered shower Monday THEN things get very INTERESTING and here's why:

Looks like we'll hit upper 70s on Tuesday possible lower 80s on Wednesday with a southerly push of air.

Photo credit: CodWx.edu

Two long range models (including Canadian and Euro) show a developing system in The Atlantic later next week. The GFS shows a low developing offshore, but generally speaking the GFS doesn't do a great job picking these systems up. I'll post a technical forecast, so keep an eye out for that.