Much colder air will move into the state tonight sending temperatures overnight into the single digits above zero to around 20 across central Iowa. The cold air will remain in place through the forecast period with chilly temperatures expected across central Iowa through the weekend. Dry conditions are expected as a large area of high pressure dominates the region through the end of the week. A storm system will begin to take shape across Rockies late this week and is expected to eject eastward across the central US this weekend. This system could bring the next accumulating snowfall to much of Iowa Sunday into Sunday night. At this time many details are uncertain, but light to moderate snowfall accumulations will be possible.