After a cold front dropped southeastward through the Mississippi River Valley Region on Sunday, cooler air is following at its heels. This, coupled with the clearing skies expected for tonight, will allow radiational cooling to occur, consequently causing temperatures to cool to near and below freezing.
For this reason, the National Weather Service has issued a Freeze Warning for areas along and west of US 63 from midnight to 9AM Monday morning. For those counties east of the US 63 corridor, a Frost Advisory is in effect until 9AM Monday morning.
High pressure will build in for tomorrow and for the first half of the week, allowing temperatures to warm to slightly above average levels. Highs will be in the 60s for Monday and Tuesday before warming into the lower 70s by Wednesday.