Our next weather system will arrive Saturday, bringing the potential for freezing rain before more widespread rain falls through the evening. The key for what type of precipitation most see will be found in our surface temperatures--both the air and the actual surface. Air warms up faster than pavement does, so even if our air temperature will be above freezing, the surface could be below that mark.
Keeping that in mind, here is how Futurecast plays this out Saturday. The onset of precipitation may come in the form of snow or wintry mix (including freezing rain) across the Western parts of the viewing area through 12PM as air temperatures will be in the 20s and low 30s. Those East of I-39 may remain dry until the afternoon, but any who see precipitation will need to watch closely for slick travel during this time.
The afternoon will feature temperatures climbing through the mid-30s, but remember the surface pavement temperature may be lower, if not below freezing. Slick spots may remain possible where precipitation falls through mid-afternoon. This is when higher rates of rainfall may overcome the freezing surface temperature, melting any ice. That said, be aware of icy travel through at least mid-afternoon! We could see nearly 0.25" of rain through early Sunday morning.
A winter weather advisory is in effect for Jo Daviess, Stephenson, Carroll, and Whiteside counties from 3AM to 3PM Saturday. This is where the highest chances are to see a glaze of ice accumulation. Meanwhile, an ice storm warning is out for parts of Eastern Iowa where nearly a quarter inch of ice may accumulate through Saturday.
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