Projected low temperatures on Sunday morning will be even colder than this morning. Areas north of I-20 will easily dip into the upper 30s. Rural areas and higher elevations will see temperatures drop between 33° to 36° which is cold enough for frost to form on the ground.
Here's a look at what you might see on Sunday morning, like Nate Geno did this morning in Oneonta.
The National Weather Service in Huntsville has issued a frost advisory on Sunday between 1-7AM for Cullman county and points northward. The National Weather Service in Birmingham has yet to issue an advisory and no matter if they do or not, which depends on a few weather factors, I would go ahead and protect sensitive outdoor plants.
Wondering how frost can form when forecast temperatures are slightly above the freezing mark? Cold air is more dense and sinks to the ground. The standard height for measuring the temperature is 6 feet which means it will be slightly warmer at that level than compared to the temperature at the surface below. So while the thermometer might read 34°, right along the ground it could be 31° with areas of frost. Soil moisture also influences the amount of frost that will form. Seeing it has been so dry, we don't expect thick frost formation, just light and patchy frost.
Have a great rest of the day,
Jill Gilardi First Alert WBRC Certified Meteorologist