We are starting to get a better of an idea on how things will unfold this week. Now it is still possible for things to change, so continue to check back here for the latest updates. We will have a much better idea by tomorrow.
Rain will begin to enter into southern Iowa by early afternoon Saturday. This will have somewhat of an impact on snowfall totals. If temperatures were cooler to start out with, any precipitation early on would fall as snow, which would allow for higher snowfall totals.
Eventually by late evening Saturday, rain will then begin to transition over to snow across the southern portion of the state. This is where we will see the best potential for accumulations. Right now, both the GFS and the ECMWF are in fairly good agreement with timing and track of this system. The NAM is a little too cool initially, which is bringing more snow into the state than is currently expected.
The snowfall accumulation line is going to be very tight. The greatest accumulations will fall near the Iowa/Missouri border, with lesser amounts the further north your travel. Once you get between interstate 80 and highway 30, snowfall accumulations will quickly drop off. Accumulations right now look to range from 2″ to 5″ with a possibility of a few 6″ accumulations along the Iowa/Missouri border. But once again, any shift north or south in this system will have a great impact on snowfall totals. Because of the uncertainty that still revolves around this system, we will closely need to monitor every new model run. The winds will also be strong, so because of this, this will also have an impact on travel. Continue to check back here at the Iowa Storm Chasing Network for the latest updates.