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Public Safety Alerts

Illinois, Missouri Minor Frost Advisory | Effective 10/17/2026 20:22

Frost Advisory issued October 17 at 10:22PM CDT until October 18 at 9:00AM CDT by NWS St Louis MO

Event: Frost Advisory

Desc: * WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Portions of southwest Illinois and central, east central, and northeast Missouri. * WHEN...Until 9 AM CDT Sunday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Areas: Greene County IL, Macoupin County IL, Calhoun County IL, Jersey County IL, Pike County MO, Audrain County MO, Osage County MO, Callaway County MO, Montgomery County MO, Lincoln County MO, Gasconade County MO, Warren County MO, St. Charles County MO, St. Louis County MO

Severity: Minor

Urgency: Expected

Effective: Saturday, October 17, 2026 - 20:22

Expires: Sunday, October 18, 2026 - 07:00

Sender: w-nws.webmaster@noaa.gov

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Public Safety Alerts