The big update this morning is that very little has changed in the forecast. Warnings of the Winter storm/Ice storm/Freezing rain variety cover a massive chunk of the Midwest. When these large storms systems are 2-4 days out, the model data flip-flops pretty frequently. Once a system of this magnitude is less than 24 away, the models align fairly well and start staying steady. The ice and snowfall forecast maps that Eric updated last night at 10pm are shown in the post below. I left these graphics untouched as I went on-air this morning, because I didn't see any data that told me otherwise.
The exact timing of this event is becoming a bit clearer. I expect precipitation to be falling from the sky between 9pm tonight and noon Friday. An hour or two of sleet may be witnessed at the onset, but this is shaping up to be a mainly snow scenario. Although, a closer look reveals the heaviest snow should accumulate between midnight and 9am Friday. This is depicted quite well by the GFS model shown here. This precipitation forecast is from midnight to 6am Friday morning as the tightly wound low passes through central Illinois. The tightness of the isobars illustrates a consistent east wind at 10-20 mph making blowing and drifting snow a problem. Winds like this are going to make it tough for snowplows to keep up with this system. Visibilities will frequently be below one mile. -ADAM
The big update this morning is that very little has changed in the forecast. Warnings of the Winter storm/Ice storm/Freezing rain variety cover a massive chunk of the Midwest. When these large storms systems are 2-4 days out, the model data flip-flops pretty frequently. Once a system of this magnitude is less than 24 away, the models align fairly well and start staying steady. The ice and snowfall forecast maps that Eric updated last night at 10pm are shown in the post below. I left these graphics untouched as I went on-air this morning, because I didn't see any data that told me otherwise.
The exact timing of this event is becoming a bit clearer. I expect precipitation to be falling from the sky between 9pm tonight and noon Friday. An hour or two of sleet may be witnessed at the onset, but this is shaping up to be a mainly snow scenario. Although, a closer look reveals the heaviest snow should accumulate between midnight and 9am Friday. This is depicted quite well by the GFS model shown here. This precipitation forecast is from midnight to 6am Friday morning as the tightly wound low passes through central Illinois. The tightness of the isobars illustrates a consistent east wind at 10-20 mph making blowing and drifting snow a problem. Winds like this are going to make it tough for snowplows to keep up with this system. Visibilities will frequently be below one mile. -ADAM
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