Frost Advisory issued April 17 at 2:27PM CDT until April 19 at 9:00AM CDT by NWS

...FROST ADVISORY IN EFFECT FROM 4 AM TO 9 AM CDT TUESDAY... * WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...In Missouri, Saint Charles MO, Saint Louis City MO and Saint Louis MO Counties. In Illinois, Madison IL and Saint Clair Counties. * WHEN...From 4 AM to 9 AM CDT Tuesday.