***Watch WISN 12 News for the latest on the winter storm!***
Thank you for stopping by the Weather Watch 12 blog! A complex winter storm will begin impacting southeast Wisconsin early Sunday morning. Keep in mind that WISN 12 News is on from 5-6am and 7-9am Sunday morning. Live radar updates and road conditions will be shown throughout the show!
If you are at home or on the go Sunday, make sure to stay updated with our interactive radar! Just click below!
The first wave of precipitation should arrive around 6-9am in most areas. This initial push of moisture will likely be either a period of snow, a mix, or freezing rain. With temperatures stuck in the 20s early Sunday, freezing rain looks like a good bet from Madison to Milwaukee and point south.
Here is the RPM forecast for 8am Sunday morning.
As freezing rain occurs, I expect roads to become slippery in many areas! Use caution traveling on Sunday.
In parts of Dodge, Washington, Ozaukee, Fond du Lac, and Sheboygan counties the precipitation may be snow, then a mix of freezing rain/sleet/snow. This part of the viewing area needs to be watched closely for an intense band of moderate to heavy snow pushing through by late mornig or early afternoon.
Below is the RPM surface and precipitation forecast for Sunday at noon. Use the map above and the color key if you are wondering what each color represents. The big question is…will this pocket of heavy snow develop? If it does…it could produce a very quick 2″-4″ of snow.
For much of Sunday afternoon I expect rain near the WI/IL border, a mix, rain or freezing rain near Milwaukee and Madison and points in between. Farther north a messy mix of all of the above including snow.
From early Sunday through 6pm, this is when most of the freezing rain will occur in our area. I expect ice accumulations to range from 0.10″ to 0.30″. Figuring out ice accumulation is never easy, and especially in this case. How much of the liquid precipitation will fall as freezing rain? Below is the total forecast precipitation amount from 6am Sunday to 7pm. Notice that almost all areas are around 0.75″.
As the surface low pushes east and tracks through north-central Illinois colder air will fill-in and change all the precipitation over the snow. This should occur across southeast Wisconsin Sunday evening and night. Just depending on where you live.
Snow totals will vary greatly across the viewing area! And just a slight shift north or south, or a degree or two difference in temperatures will mean the difference between mainly freezing rain, or heavy snow.
Right now around parts of Fond du Lac, Ozaukee, Sheboygan and parts of Washington counties a band of 6″-10″+ is possible. If this area would see all/mostly snow from this storm then these totals would be higher. Lowest totals will be near the WI/IL border with 1″-2″ in non-lake effect areas well inland. Parts of Racine and Kensoha counties may see some lake effect snow Monday, pushing totals up another inch or so there. In and around Milwaukee totals should approach 4″. If a band of snow occurs Sunday morning then this total would be higher.
The RPM snowfall forecast is below. The higher totals around some lake county areas is from lake ehanced/effect snow that will kick in Sunday night and Monday.
Stay with WISN 12 News for updates all day Sunday, and look for updates right here in the blog! Make sure to let us know what you think, and post your storm reports to the comments section of the blog.