Frost Advisory issued April 22 at 3:57AM CDT until April 23 at 9:00AM CDT by NWS

...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM CDT SUNDAY... * WHAT...Temperatures as low as 33, light winds, and clearing skies will result in frost formation. * WHERE...Portions of south central and southwest Illinois. Portions of east central and southeast Missouri. * WHEN...From 1 AM to 9 AM CDT Sunday.