It can be hard to tell when pumpkin spiced latte season arrives in southern Colorado.

Today has not been one of those days.

Temperatures are between thirty to forty-five egrees cooler than yesterday.

But that's not the biggest surprise to many of you this time of year. Powerful season-shifting cold fronts are actually common in September.

A cold front divides two different masses of air with the colder air pushing the warmer air away. Fronts form and are fueled by temperature contrasts - the bigger the contrast, the more potent the front.

As we head into fall, the days are getting shorter in the Northern Hemisphere - but they're staying about the same length in the tropics.

So the air in the Arctic gets colder but the air in the tropics remains hot.

Because of that the northern bran

See Full Page