A slow moderation in temperatures will continue for the remainder of this week, but in spite of this warm up readings will still remain at or below average for late March. By Saturday and Saturday night, the northward surge of warm and unstable air will produce showers and a few thunderstorms that will overspread the entire region. However, the wet weather should come to an end early Sunday with the passage of a cold front. Highs on Sunday will range from the mid 50s across northern Missouri and central Illinois, to the low to mid 60s over southern Missouri and southern Illinois.   (Please visit http://weather.gov/lsx for more information.)