Wednesday is the busiest travel day of the year. And in a bad case of timing, a winter storm is threatening to play a major role in many traveler’s plans. The graphic to the right shows the counties under a Winter Weather Advisory shaded in Blue. This is where there is the greatest risk for both snow and a wintry mix that could include freezing rain.
This advisory takes effect during the morning hours of Wednesday and runs until Midnight early Thursday morning. Any such mix of wintry precipitation could lead to dangerous travel conditions. Forecast models this evening are doing a much better job of coming to a bit of consensus on how this will all play out. Precipitation is expected to begin during the early morning hours over much of Iowa.
Areas along and west of Interstate 35, as well as areas north of Highway 20 face the greatest threat for icing conditions. Areas west of Interstate 380 might also see a wintry mix later in the day, during the afternoon hours. By evening, a changeover to snow might take place as the storm system exits, but snow showers should not lead to any major accumulations.
Once the storm exits the area Wednesday night into Thursday morning, bitterly cold air will filter in from the northwest, leading to a very chilly Thanksgiving. Some parts of Iowa might not see highs above 20 degrees on Thursday. The cold will continue until a slight warm up over the weekend and another storm system threatens to bring a round of snow to Iowa on Monday.
We’ll have an update tomorrow on the situation as the storm finally makes its way into the state.