Hail To The Chief: Another Late Season Snow Closing In

James Zahara Weather Blog

Hi Everyone! This morning has been more of a teaser to what is anticipated within the next 18 to 24 hours. This first wave is what is called a ‘warm advection snow’ as slightly warmer or above freezing temperatures push in from the southwest. This will allow to melt this early morning light snowfall and climb temperatures just above freezing this afternoon.

Now, comes the more prolonged, substantial snowfall expected to arrive late tonight into Tuesday. The system, located across the Northern Plains, will dive southeast and position itself in downstate Illinois by Tuesday night. During this period, a wave of energy sliding out of the southern Rockies will interact and intensify the system producing the more moderate snowfall. The GFS computer model has been the most consistent these past several days with the NAM and EURO now catching up.

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Here’s the breakdown which shows the heaviest of the snow to remain along and north of Highway 30 with snowfall amounts expected around 6 to as high as 9 inches. Along the Interstate 80 corridor especially around the Quad Cities..4 to 6. Just south, near Highway 34, I’m looking around 3 to 4 inches with much lighter amounts even further south.

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What about the blowing and drifting? Given its tight circulation..no doubt. I’m looking around the afternoon hours for winds to pick up which could exceed over 30 mph. This will continue into that evening and overnight hours before diminishing before sunrise Wednesday.

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This is another wet-compact snow so take it easy out there especially if you’re relying on that trusted shovel. The good news besides more snow to go sledding or make forts is that we’ll actually be above normal in snowfall amount this season! A ‘rah’ for our farmers!!!