Winter Storm To Bring Snow, Sleet And Ice To The State Late Week/Weekend (Fri-Sat, Jan 17-18th) Update #3

​(6:30AM - 1/15/20) A storm system will move through the region on Friday and Saturday, bringing with it a wide range of precipitation types across the state, including snow, sleet, ice and rain. At this time, light to moderate accumulations of wintry precipitation are likely across at least portions of the state.
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Synopsis...
Model guidance has been in decent agreement regarding this period for the past several days. A storm system cutting west to east across the Midwest is expected, with accumulating snow/sleet/ice expected across a large portion of the region.

Precipitation is likely to begin as snow as it enters Northwest, West and Southwest Illinois Friday morning. As precipitation then spreads across the state the rest of Friday morning and Friday afternoon, a several hour period of snow to sleet to freezing rain will occur. This wintry mix will last through the evening, before precipitation transitions to rain across the state Friday night. We will have a better time-line regarding precipitation type and timing in future updates.

By early Saturday morning, precipitation will have fully changed over to rain across the entire state. Rain showers will then continue into Saturday afternoon, before ending from west to east across the state. It is possible that precipitation ends as a few snow showers across portions of Northern Illinois, though little to no additional accumulation is expected.

Final snow/sleet totals over much of Northern and Central Illinois will range from 1-4", with higher totals likely near the Illinois/Wisconsin border. Ice totals will likely range from a glaze to 0.15" across much of the state, though locally higher amounts will be possible across the heart of the state.

Below are the TAM snow/sleet and ice forecasts for this event.

JP

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