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St. Louis Weather:

ST. LOUIS – Snow has been a no-show for much of this winter – until now. A Winter Storm Watch covers the entire area for late Tuesday night through Thursday. The storm is expected to bring significant snow, sleet and freezing rain across the region with impacts on travel and daily activities.

Confidence in a high-impact event affecting the entire region continues to grow this morning. There is some uncertainty of the exact form the winter precipitation will take, especially along the I-44 and I-70 corridors, which includes all of the St. Louis area.

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Starting north of I-70 the precipitation will start as rain Tuesday but change to snow Tuesday night. Several waves of moderate to heavy snow are likely through Thursday morning with total accumulations of 9 to 12 inches possible. Further south in the transition zone, confidence in the types of winter precipitation is low, so this is the region where the forecast may change the most leading up to the event.

Any small deviations in the amount of cold air (and warm layer) in the clouds could mean much more sleet and less snow, or vice versa. For that reason, don’t focus so much on the exact numbers, focus on the impacts which will major either way.

Significant icing of 1/4 inch or greater is possible in addition to either a heavy sleet or light snow accumulation. Power outages may become a concern by Wednesday night and Thursday morning.

It’s time to make preparations now and adjust any plans in the Wednesday and Thursday timeframe accordingly.