A Wind Advisory continues for southern Wisconsin and northern Illinois through this evening as winds will likely gust near 40 mph, or better. The winds will be accompanied by rain showers and maybe even a few isolated storms (especially to the south) as an area of low pressure moves into northern Illinois tonight. Wind gusts were already nearing 40 mph across the immediate Stateline and actually close to 50 mph near Moline and Sterling. Loose objects such as lawn furniture and garbage cans could blow around and travel on north/south roads will likely be difficult.
This is the reason for all the wind, severe weather and snow yesterday and today. A very strong area of low pressure will strengthen as it moves into northern Missouri later today and eventually into northeast Illinois by Saturday morning. Out ahead of it severe weather in the south and it's actually pulling down enough cold air to cause snow, significant snow at that, across the Plains. We are on the north side of this system and as it does continue to strengthen the winds will likely remain at this pace through tonight.
This image depicts the mean sea level pressure and temperatures of the U.S. I've highlighted where the low currently sits and look how closely spaced the pressure lines are. The closer the lines are together, the stronger the winds will be. The reason why the winds will remain this gusty into tonight is because pressure falls ahead of the low are fairly significant; which is an indication that the low will strengthen. Once the low moves overhead tonight the winds may relax some, but it will still be breezy. As the low moves over the Great Lakes Saturday winds will probably pick up again but likely not be as gusty as they are today.
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