After a wet and chilly start this morning, the sun is returning today.
That will rebound temperatures to the low to mid 60s this afternoon.
However, with clear skies tonight, scattered frost should appear for the first time in many locations, especially outlying areas.
Yesterday we explained how cloudy skies trap in "heat" keeping frost from forming, while clear skies allow radiational cooling to occur dropping temperature to lower levels that are more conducive to frost.
With clear skies tonight, we anticipate mid to upper 30s across Middle TN with scattered frost likely.
Question: How does frost occur when the temperature is above 32°?
Answer: The ground is a solid object (so is your car). Solid objects can actually radiate their heat out and become colder than the air surrounding them. The ground or your car might drop to 32° while the air is still 35-36° above them.
The more dense the object, the quicker this occurs. Hence, the frost forms on the more dense car before it does on the less dense ground.