TRENTON, NJ — Temperatures could take a nosedive in parts of New Jersey.

The National Weather Service has issued a freeze warning for Sussex, Warren, Morris, Hunterdon, Somerset, Passaic, and parts of Bergen, Essex and Warren counties early Saturday.

Forecasters say temperatures could range from the mid 20s in northwestern New Jersey to the upper 20s and lower 30s elsewhere.

A freeze watch is in effect for Ocean, Cumberland, Atlantic and southeast Burlington counties. Temperatures are expected to be around 30 Saturday morning.