Fog is developing tonight in parts of the region, and is leading to visibility less than a mile, with dense fog and visibility of less than one-quarter mile also reported, according to the National Weather Service in Wilmington.
Overnight lows will be around 20 degrees. The fog is expected to remain overnight in parts of Champaign, Clark, Darke, Greene, Miami, Montgomery, and Preble counties. The NWS urges motorists to be prepared for changing visibility, and to slow down for dense fog.
Skies will be mostly cloudy to start the day, which will have high temperatures in the lower 40s. Rain is expected to arrive between 2 and 7 p.m. Thursday. Some snow will mix in near and north of Interstate 70. A cold front will move through later in the night, when rain everywhere will switch to snow and wind gusts will increase to between 30 and 40 mph. As the cold front moves through overnight, there will be a rapid decrease in temperatures and sharp transition to snow across all counties. New snow accumulation is predicted to be less than 1 inch, according to the NWS.
Starting in the early morning on Friday, the NWS also predicted stronger, gusty winds, with some gusts being as high as 30 mph. The stronger winds will linger most of the day Friday. High temperatures will remain below freezing, around 28 degrees, though wind chills will make it feel like it is in the low teens. Clouds will decrease somewhat for partly cloudy skies going into Friday night. Winds are expected to die down Friday night, and temperatures will drop along with it to a low in the mid-teens.
The NWS also has issued a warning that it expects a significant cold spell starting Saturday night that will linger into early next week. The extreme cold may mean high temperatures in the teens with low temperatures in the single digits, possibly subzero.
Previously, the NWS said that it has been most of two years since Cincinnati saw single-digit weather, the second-longest streak on record. If Cincinnati sees single digits on Saturday night, the streak will end at 704 days, one week shy of the previous record, which ended at 711 days on Jan. 21, 2013.
Prolonged exposure to these bitter conditions can lead to frostbite or hypothermia. Some signs of frostbite include a burning sensation, tingling or numbing. Hypothermia can begin with shivering, followed by drowsiness, shallow breathing, slurred speech and, eventually, unconsciousness and death.
Temperatures are expected to drop still further on Sunday, with the high will only reaching 14 degrees. Overnight the low temperature will fall to minus 3 degrees, the NWS said.