A Chill On The Way With Pockets of Frost

I have pockets of frost in the forecast this weekend, especially Sunday morning.

Valleys are particularly vulnerable. As cool air drains into the valleys and pools there it can get cold enough early in the Fall season for patchy, light frost.

Car windshields and car metal surfaces, because they cool so effectively,y are often first to get a coating of frost.  Again in valleys this may happen first but even slight low spots in the suburbs can have enough cool air pooling to cause frost early on the windshield.

But because it is early in the season, stored heat is a big factor and I do NOT have a killing frost in the area this weekend.

The video below explains the topic more.