A strong cold front moved through the Ohio Valley on Thursday, ushering in a colder airmass for the weekend. By Saturday morning, surface high pressure will be anchored over the middle Mississippi River Valley, allowing for mostly clear skies and nearly calm winds generally west of I-65. This atmospheric setup will allow for temperatures to drop into the mid and upper 30s by dawn on Saturday. Although conditions will be marginal for frost, a few areas will see frost develop, especially in sheltered areas and valleys.
The threat for patchy frost will likely shift east of the I-65 corridor by Sunday morning. Again, only patches of frost will be possible in sheltered areas and valleys. Stay up to date with the latest forecasts if you have plants that could be affected by a light frost.