NWS St. Louis

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A weak system will move southeast through portions of the area. This system will bring a chance of snow to northeast MO and west central IL, with higher chances further north and east where some light accumulation is expected. Tonight is expected to be warmer than this morning with temperatures generally in the upper teens to middle 20s across the area. (Please visit http://weather.gov/lsx for more information.)

Some of the coldest weather of this winter is expected over the region tonight, as an arctic high plunges into the mid-Mississippi Valley. Overnight lows will be plummeting into the single digits but strong northwest winds will make it feel much colder, with wind chills at or below zero. (Please visit http://weather.gov/lsx for more information.)

Colder air will move into the region tonight causing overnight lows to fall into the single digits in most locations. The coldest temperatures will be over northeast Missouri where readings are expected to be below zero by early morning. While the wind will slowly decrease through the night, wind chill values are expected to fall below into the -10 to -15 range over much of northern Missouri and central Illinois. (Please visit http://weather.gov/lsx for more information.)

Snow flurries will continue this evening. Overnight low temperatures will be in the 20s. (Please visit http://weather.gov/lsx for more information.)

An ongoing storm system will bring accumulating snow across parts of western and northern Missouri this morning. The snow will diminish this afternoon as the storm moves out of the Midwest. Winds will turn out of the northwest today ushering much colder air into the region causing temperatures to slowly fall throughout the day. (Please visit http://weather.gov/lsx for more information.)

Thunderstorms will become more widespread through this evening as a strong cold front sweeps east and interacts with the humid and unstable airmass over our area. A few of the thunderstorms may become severe, with damaging straight-line winds and brief, short-lived tornadoes being the primary threats. Areas of heavy rain can also be expected. (Please visit http://weather.gov/lsx for more information.)

The unseasonably warm air that surged into the region on Monday will set the stage for widespread showers and thunderstorms on Tuesday and Tuesday night, as a strong cold front sweeps east and interacts with the humid and unstable airmass. A few of the thunderstorms may become severe, with damaging straight line winds and brief, short-lived tornadoes being the primary threats. Areas of heavy rain can also be expected. (Please visit http://weather.gov/lsx for more information.)

Southerly winds will bring unseasonably warm and humid air into the region on Tuesday ahead of an approaching cold front. Thunderstorms are expected along and ahead of this front on Tuesday and Tuesday evening. Some of these storms may be severe. (Please visit http://weather.gov/lsx for more information.)

Southerly winds will bring unseasonably warm and humid air into the region on Tuesday ahead of an approaching cold front. Thunderstorms are expected along and ahead of this front on Tuesday and Tuesday evening. Some of these storms may be severe. (Please visit http://weather.gov/lsx for more information.)

An approaching warm front will bring precipitation into our area late tonight and Sunday. With cold air in place the precipitation will likely begin as freezing rain over much of our area, with the most ice accumulation expected across northeast Missouri and west central Illinois. A freezing rain advisory has been issued for areas along and north of a Paris Missouri to Troy Missouri to Litchfield Illinois line through midday on Sunday. As the temperature warms above the freezing mark the precipitation should change over to all rain everywhere by late Sunday morning. Temperatures will remain well above normal through Tuesday with several additional rounds of rain...as well as some thunderstorms Monday night through Tuesday evening. (Please visit http://weather.gov/lsx for more information.)

An approaching warm front will bring precipitation into our area late tonight and Sunday. With cold air in place the precipitation will likely begin as freezing rain over much of our area, with the most ice accumulation expected across northeast Missouri and west central Illinois where a freezing rain advisory has been issued. As the temperature warms above the freezing mark the precipitation should change to liquid rain by late Sunday morning. (Please visit http://weather.gov/lsx for more information.)

An approaching warm front will bring precipitation into our area late Saturday night and Sunday. With cold air in place the precipitation will likely begin as freezing rain, possibly mixed with sleet across northeast Missouri and west central Illinois. As the temperature warms above the freezing mark the precipitation should change to liquid rain Sunday afternoon. (Please visit http://weather.gov/lsx for more information.)

A weak area of low pressure will bring a light wintry mix of freezing drizzle, sleet and snow to the region Thursday night. The very cold surface temperatures will allow any precipitation to accumulate and produce hazardous driving conditions on untreated roadways Thursday Night and Friday Morning. (Please visit http://weather.gov/lsx for more information.)

A weak area of low pressure will bring a chance of a light wintry mix of precipitation to the region Thursday night. The very cold surface temperatures will allow any precipitation to accumulate and produce hazardous driving conditions on untreated roadways. (Please visit http://weather.gov/lsx for more information.)

A weak area of low pressure will bring a chance of a light wintry mix of precipitation to the region Thursday night. The very cold surface temperatures will allow any precipitation to accumulate and produce hazardous driving conditions on untreated roadways. (Please visit http://weather.gov/lsx for more information.)

A weak area of low pressure will bring a chance of wintry precipitation to the region Thursday night. It looks like there may be a mix of snow and sleet across northeast Missouri and west central Illinois, and sleet and freezing rain across central and southeast Missouri as well as southwest Illinois. The very cold surface temperatures will allow any precipitation to accumulate and produce hazardous driving conditions on untreated roadways. (Please visit http://weather.gov/lsx for more information.)

A weak area of low pressure will bring a chance of wintry precipitation to the region Thursday night. It looks like there may be a mix of snow and sleet across northeast Missouri and west central Illinois, and sleet and freezing rain across central and southeast Missouri as well as southwest Illinois. The very cold surface temperatures will allow any precipitation to accumulate and produce hazardous driving conditions on untreated roadways. (Please visit http://weather.gov/lsx for more information.)

A weak area of low pressure will bring a chance of wintry precipitation to the region Thursday night. The very cold surface temperatures will allow any precipitation to accumulate and produce hazardous driving conditions on untreated roadways. (Please visit http://weather.gov/lsx for more information.)

An arctic airmass over the northern Plains will slide southeast through our area tonight and Tuesday. This cold ridge of high pressure will keep temperatures well below normal through Tuesday. There will be a brief warm-up on Wednesday, but another cold front will push through Wednesday night and another very cold high pressure system will build into the Mid-Mississippi and Ohio Valleys Thursday. Meanwhile...a storm system will develop over the Great Plains which will push warm moist air up over the shallow cold layer over Missouri and Illinois. A variety of wintry weather is possible Thursday and Thursday night depending on the depth of the cold air. (Please visit http://weather.gov/lsx for more information.)

An arctic airmass over the Eastern Plains will slide southeast into the Ohio Valley through Tuesday. This high will keep temperatures well below normal through Tuesday. There will be a brief warm-up on Wednesday...but another cold front will push through Wednesday night and another very cold high pressure system will build into the Mid-Mississippi and Ohio Valleys Thursday. Meanwhile...a storm system will develop over the Great Plains which will push warm moist air up over the shallow cold layer over Missouri and Illinois. A variety of wintry weather is possible depending on the depth of the cold air. (Please visit http://weather.gov/lsx for more information.)