A trough of low pressure and a pool of colder air is building over the Pacific Ocean today.
Winter weather advisories cover much of east-central and southeast Alaska, including Fairbanks and areas east of Anchorage.
By early next week we should see the first signs of this cooler air sweeping across the lower 48.
Denver will see highs drop from around 80 this week to just above 60 next week, and our overnight lows are forecasted to dip into the mid and upper 30s.
Some locations closer to Canada have already seen some chilly weather. In fact, central Wisconsin (north of Madison) is currently under a frost advisory for lows dropping into the 29-32° range tonight.
A frost advisory is issued when temps may drop into the upper 20s and lower 30s briefly, but not long enough to end the growing season.
A freeze advisory is issued when temps are expected to drop below 29 degrees for several hours, putting an end to the growing season.