The National Weather Service changed several of its winter weather terms in October 2024. Here is what they new terms mean.

In Grand Rapids, a cold weather advisory is issued when there is forecasted three or more hours of temperatures or wind chill (the “feels-like” temperature) at -15 degrees or colder. An extreme cold warning will be issued when there is forecasted three or more hours of temperatures or wind chill at -25 degrees or colder.

A Cold Weather Advisory is issued when air temperatures or wind chills of at least -10 degrees are expected, Dunn said. In contrast, an Extreme Cold Warning would be issued when air temperatures or wind chills below -25 degrees are expected.

Temperatures fell to near 20 degrees on Sunday morning with wind chills in the single digits. As a result, the Cold Weather Advisory will remain in effect until 9 a.m. Monday.