NORMAN, Okla.—The Storm Prediction Center says icing could occur in the next few hours from northwestern Texas across central Oklahoma and into Missouri, but that warm ground temperatures could diminish part of the threat. An interstate ramp at Oklahoma City was closed for 35 minutes Friday night.

Freezing rain rates of greater than one-tenth-of-an-inch per hour could occur along the I-44 corridor, including Oklahoma City, Tulsa and Joplin from Friday night into Saturday morning.

The greatest ice accumulations are expected on elevated surfaces, given that the past few days have been nice and the ground is still warm.

Oklahoma highway officials said Friday evening that the ramp from eastbound Interstate 40 onto northbound I-35 just east of Oklahoma City was closed for more than a half-hour due to icing.