Confidence continues to increase for the potential for moderate rainfall on Sunday across eastern Iowa. A low pressure system will be lifting across Missouri late tonight, and as it continues to lift off to the northeast, moisture will be on the increase by tomorrow morning across southeast Iowa. Rainfall will begin across southeast Iowa after 6am Sunday.
The heaviest of the rainfall will be across eastern Iowa. This is where rainfall totals through Monday will range from a half inch to as much as 1.5″.
As the strengthening low pressure system moves off to the northeast, colder air will be moving in on the backside. This will will change any remaining moisture over to snow late Sunday night into early Monday morning. This change over will be likely after midnight Sunday.
Snowfall accumulations will be on the light side. Snowfall accumulations look to stay between the 1″ to 2″ mark along the Mississippi river, however, some isolated 3″ totals may be possible. The bigger impact will not be the snow, but the wind.
Winds on Monday will be gusting between 25mph and 35mph as the pressure gradient begins to increase. Between the combination of the light snowfall totals and the strong winds, blowing snow will be likely. Snowfall totals will be below advisory criteria, however, the blowing snow may result in an advisory. Light snow will continue to be possible across eastern Iowa during the day on Monday as lingering moisture will still be behind this system. Eventually snow showers will come to an end Monday night. Much of next week, temperatures will remain in the 30’s with another chance of light snow by Wednesday.