STORM MODE: Tracking snow totals and travel impacts from Tuesday night to Wednesday | Climate


Winter weather returns to the region on Tuesday night with a mix of rain and snow that will transition to all snow.


Tuesday will be calm during the day with cloudiness increasing throughout the morning. Eventually, it will become cloudy with highs in the mid-40s.


Precipitation is expected to begin late Tuesday night with a mix of rain and snow that will transition to blizzard overnight. The time should be around 7pm or after 7pm in much of mid-Missouri. The snow will continue into Wednesday, with most of the accumulated snow coming to an end by midday on Wednesday. Light bursts will remain possible for much of the day.

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The system is due to a low pressure system that will run through southeastern Missouri. As this low pressure system will be a good distance away, we will see minor impacts across much of the region. The highest impacts will occur in areas along and south of I-44 where a winter storm warning is in effect.

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This system is still about a day away, but is expected to be a larger storm for the southeastern parts of the state. Temperatures are expected to range between the 30s and 30s during this event, meaning wet snow that will even melt when it falls. We’ll also need to keep an eye out for any dry air that might interfere with this storm, but that’s not expected to be a major factor.

Most of the middle of Missouri is expected to see 2-4” of snow. Some areas of locally higher amounts cannot be ruled out as you head south.

Snow totals in the 4-7+” range will be possible for areas along and south of I-44, including all of southern Missouri, Rolla, Lake of the Ozarks and the St. Louis Metro. Louis. Snowfall rates can approach 1″ per hour during the early morning hours near I-44. Travel along this interstate will likely be difficult.

Areas in the northwestern parts of the state may only see a one-inch layer of snow.

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The KOMU 8 Storm Mode Index will be at 3 for this event, which means we expect problems, especially in areas south of Highway 50 near I-44. This won’t be a major blizzard, but it will likely slow down travel on Wednesday morning, especially to the southern parts of the region.

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Travel will likely be fine through Tuesday night, but conditions will begin to deteriorate overnight on Wednesday morning. When the snow starts, the roads will initially be wet and muddy, but are expected to be covered in snow by Wednesday morning.

Road crews will likely struggle to pre-treat roads due to this system starting as rain, which would wash out the treatment.

Travel is likely to get worse on Wednesday morning. The snow will end at midday on Wednesday, so conditions should start to improve in the afternoon and evening due to road crews’ work and temperatures above zero.

It would be a good idea to clean your car, garage, driveway, etc… Wednesday afternoon when temperatures are above freezing. Heavy, wet snow will freeze on Wednesday night, and it will be much more difficult to deal with it on Thursday.

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Thursday will be a cool day with morning temperatures around 20 degrees and highs around 30 degrees under cloudy skies.

We’ll get warmer on Friday and Saturday, leading to a fair amount of snowmelt before another chance of rain/snow returns on Sunday.

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