Beginning late tonight, precipitation will begin to increase from the west. A light wintery mix will begin after midnight tonight, and will increase by sunrise Tuesday. Across northern Iowa, a mix of snow and light freezing rain will be possible early Tuesday morning, before switching to a cold rain by midday.
Across the rest of the state, temperatures will be warm enough that precipitation will fall as a cold rain. Overall, widespread rainfall totals of a tenth to a quarter of an inch will be likely. Across northern Iowa, where temperatures Tuesday morning will be cold enough for snow, accumulations will be between a tenth to a half inch, with locally higher amounts near an inch across extreme northwest Iowa. This snow will quickly melt as snow transitions to rain.
At this time, very little no ice accumulations are expected, as the freezing rain period will be very brief and surface temperatures will be warm enough. As the low continues to track to the east Tuesday evening, rain will transition back over to a freezing rain/ snow mix across northern Iowa. Since precipitation will be wrapping up during this transition, any accumulations would be very light to none.
Main points to take away will be some minor road condition issues across northern and northwest Iowa early Tuesday morning and then again late Tuesday morning. The second take away will be most of the precipitation will fall as rain. It should be noted, a degree or two difference, warmer or colder, will have a big impact on this forecast. If temperatures cool a couple degrees more than forecasted, more ice and snow will occur. If temperatures warm a couple degrees more than forecasted, more rain will be likely across northern Iowa.
The remainder of the week will stay active, as the next system will move through Thursday night into Friday. This system will mainly impact northern Iowa. Unlike Tuesday’s storm system, Thursday’s system will be primarily all snow, which will cause travel issues.
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