At 9:50 a.m., Forrest Mitchell with the National Weather Service, Norman said, “We are extending the dense fog advisory until noon today, to the east of a line from near Medford to El Reno to Frederick.
“Visibilities are still as low as one-quarter of a mile in several locations. These conditions will persist until around noon today,
with improving visibilities early this afternoon.
“A shallow layer of very moist air remains trapped under a temperature inversion. We expect the wind to remain very light this
morning. The combination of these will result in the fog persisting for a few more hours.
“Residents should still try to finish outdoor activities by Tuesday evening. A strong cold front will be drop daytime temperatures into the 40s on Wednesday in the Oklahoma City metro, with a prolonged period of below freezing temperatures from Wednesday night through Sunday. Light freezing rain is possible Thursday, with mainly light sleet and snow Thursday night.”