The NWS has issued a FROST ADVISORY for the City of St. Louis Sunday morning, 10/18/2015 from 12 AM to 8 AM. #STLWX 
FROST ADVISORY IN EFFECT FROM 12 AM TO 8 AM CDT SUNDAY...
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A FROST ADVISORY...WHICH IS IN EFFECT FROM 12 AM TO 8 AM CDT SUNDAY.
* TIMING...WIDESPREAD FROST IS EXPECTED SUNDAY MORNING.
* TEMPERATURES...LOWER TO MIDDLE 30S.
* IMPACTS...SENSITIVE PLANTS AND TREES MAY BE DAMAGED OR KILLED.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A FROST ADVISORY IS ISSUED WHEN FROST IS EXPECTED TO DEVELOP DURING THE GROWING SEASON. THOSE WITH AGRICULTURAL INTERESTS IN THE ADVISORY AREA SHOULD PROTECT TENDER VEGETATION. ALSO...POTTED PLANTS NORMALLY LEFT OUTDOORS SHOULD BE COVERED OR BROUGHT INSIDE AWAY FROM THE COLD.
http://forecast.weather.gov/MapClick.php?x=209&y=141&site=lsx&zmx=&zmy=&map_x=209&map_y=141#.ViEJ13pVikp
Address/Location
City of St. Louis Emergency Management
1915 Olive St
St. Louis, MO 63103
Contact
Emergency: 9-1-1