Freeze warnings are issued from May to October (but can be extended if necessary), when low temperatures are expected to be 29-32 degrees. If there is a potential for temperatures to fall into these thresholds, a freeze watch may be issued a few days ahead of time.

A sudden and sharp drop in temperatures has triggered freeze warnings across 16 states in the U.S., stretching from the Northeast and Midwest to southern and western states, as early-season cold air surges across the country.

The National Weather Service issued another Freeze Warning across our area for Thursday morning as temperatures drop into the lower 30 degrees.

The warning was for John Day Basin, Foothills of the Southern Blue Mountains of Oregon and North Central Oregon.

"Subfreezing temperatures as low as 24 [degrees Fahrenheit] expected" in some areas of Minnesota and North Dakota, the NWS said.

Freeze warnings are issued from May to October (but can be extended if necessary), when low temperatures are expected to be 29-32 degrees. If there is a potential for temperatures to fall into these thresholds, a freeze watch may be issued a few days ahead of time.