Ahead of winter weather arriving Sunday and Monday, the National Weather Service has issued a winter storm watch for the counties highlighted in deep blue on the map below. 

Bi-State Weather Watches & Warnings
Winter watches and advisories for Missouri and Illinois
KSDK

A winter weather advisory has also been issued for the areas highlighted in purple. Mostly wintry mix is expected in these areas, with icing being a main concern.

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Snow will arrive Sunday by lunchtime, but it will not be all snow. There will be bands of freezing rain and sleet. With the addition of freezing rain and sleet, icing will be a serious concern.

At some points between Sunday and Monday, snowflakes will fall throughout the bi-state. There will be bands of freezing rain and sleet that will track through in the evening.

RELATED: Live interactive radar

Wintry accumulations Monday
Predominant winter weather map for Sunday and Monday
KSDK

The freezing rain line will need to be closely monitored, as this is where the icing concerns will be greatest. It does not take much for temperatures to rise enough to see snow turn to icy mix.

RELATED: 'It's incompetence at best' | State rep says MoDOT's snow response needs improvement

Download the free 5 On Your Side app to get the latest watches and warnings and track conditions live with our interactive radar. Use the links below to download now. 

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