Well it was only a matter of time before we would start talking about the first snow, and now is the time as snow is in our forecast for Friday. It will be a light snow, but just enough to start getting you in the Christmas spirit.
As for timing, snow will begin to move into the northern portion of the state by Friday morning. Snow will then overspread much of the state by the noon hour, before eventually moving out of the state by Friday evening. The heavier snow bands look to be across northern Iowa but this could change depending on the track of the storm. So far the model runs have been fairly consistent run to run so there is a decent amount of certainty here.
Now one thing to note is the snowfall forecast map at the top of the page. The models are showing a range of 1″ to 4″ but road and soil temperatures need to be factored in. As of 3pm this afternoon (Tuesday), road and bridge temperatures across the state were in the upper 50’s to near 60 degrees.
Soil temperatures as of Monday were also above freezing in the upper 40’s. This will cause any snow that does fall, to melt on contact. Eventually, some snow may begin to accumulate, but any snowfall forecast graphics need to take this into account. If we take this into account, some light accumulations will be possible, mainly 1″ to 2″. We will have updated snowfall forecast maps as we near closer to Friday as these will continue to change.
After this system moves out, highs on Saturday will range from the mid to lower 30’s across the state. Sunday, temperatures will be a few degrees warmer as highs will range from the mid 30’s to near 40°F. The models then try to bring another system through on Sunday followed by another one on Wednesday of next week, so we will continue to monitor these as these may have an impact on your Thanksgiving travel plans.