A Frost Advisory has been issued by the National Weather Service in Des Moines as the temperatures tonight should dip into the low to mid-30s. The advisory covers 66 of Iowa's 99 counties, including Black Hawk, Bremer, Grundy, and surrounding communities.

The advisory begins at 1 AM Friday morning and continues until 8 AM. There's also a chance of frost Friday night into Saturday morning.

According to the National Weather Service: 

Frost Advisory means that temperatures are expected to fall into the mid 30s°F, which could lead to frost on vegetation. Frost advisories are only issued during the growing season. Cover any sensitive vegetation outdoors.

Freeze Watch means that temperatures are expected to fall below 32°F within the next 12 to 48 hours. Freeze watches are only issued during the growing season. This cold air will likely kill any sensitive vegetation that is not brought indoors or protected.

Freeze Warning means that temperatures are expected to fall below 32°F within the next 36 hours. Freeze warnings are only issued during the growing season. This cold air will likely kill any sensitive vegetation that is not brought indoors or protected.