The surface weather map above is for Monday. It shows the winter storm in the upper Midwest and Great Lakes with the Polar Cold front trailing South into Texas. The Surface weather map below shows Tuesday Morning January 29th:

The polar cold front moves into Georgia and a weak low pressure system forms on the front in North Georgia. There looks to be a brief period of light rain in the early morning, followed by a brief period of light snow ROUGHLY from 10am to 7pm. The snow starts earliest in the far NW suburbs and not until 4pm or after far SE suburbs, somewhere in-between for locations between those areas.

Except in the mountains, accumulation looks most likely to occur on elevated surfaces off the ground, such as grass, trees, bushes, signs, decks and rooftops since surface air temperatures are expected to be above freezing.

However, if the RATE OF FALL of the snow is faster than currently expected that could change to include highways.

Also note that temperatures are expected to fall to near or below freezing by 6pm give or take a couple hours.

KEEP IN MIND THESE FINE DETAILS LIKELY WILL NEED TO BE ADJUSTED AS WE GET CLOSER TO THE OCCURRENCE. 

Scientific consensus says snow amount and location forecasts are more reliable within 72 hours, so I’ll look at numbers after today, for now:

Please read previous blog on same subject if you missed it.

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