Coldest Air of Season Near

***Watch WISN 12 News for the latest on the cold weather ahead!***

Thank you for stopping by the Weather Watch 12 Blog!  The first full month of Fall is upon us as October is here!  Just as October arrives, weather more typical of November is about to settle in.  If you remember back to last October, a very cold one, the first 18 days of the month had highs in the 40s or 50s!

The first 32 degree or lower reading in Milwaukee last Fall was on October 10 when it was 32 degrees.  Just one day later it was 29 degrees on the 11th.

This weekend’s cold push will give many furnaces and heaters their first workout of the Fall.  Not only will it be cold, but showers and frost are possible at times.  Let’s look in-depth at the changes ahead.

The best part of the day on Friday will be the morning and early afternoon.  That is when highs will top out in the upper 60s and some sunshine will be enjoyed.  By late in the day a strong cold front will drop south of the area.  This will bring clouds and a chance of rain showers. 

Below is a forecast map valid at 7:00 p.m. Friday, right when high school football games are kicking off!  Notice the green, this represents rain showers.  So expect a few showers near the cold front late Friday and Friday evening.  Notice the blue over southern Canada…that is snow! 

The showers should end over inland locations Friday Night, but with cold air spilling over Lake Michigan, lake effect rain showers could form.  The wind direction will play a major role in how far inland the lake effect showers move.  A north wind will keep showers right by the shore, a slight north-northeast wind will move the showers farther inland.  While a northeast wind could mean a few showers for areas well inland.  The wind direction will play a huge role in who see’s the showers on Saturday.

Another focus for the weekend forecast is the chance of frost.  Temperatures will be coldest inland, but even near the lakeshore temperatures could flirt with the 30s.

Below is the forecast temperature map at 7 a.m. Sunday from our in-house high resolution computer model.  It’s a little tough to see, but you can click on the image.  The isotherm in southwest Wisconsin is labeled 32 degrees.  As you move closer to Milwaukee, temperatures climb into the mid 30s, and then closer to the lakeshore the low 40s.

This means frost is possible well inland Sunday morning, but widespread frost is possible Monday morning with mostly clear skies and lighter winds!  So cover or bring in any plants that you want to save.  We will make sure to show detailed overnight low temperature maps on WISN 12 News on Friday and Saturday. 

Have a great day!

Jeremy Nelson


3 Responses

  1. Jeremy in all of your years of doing the LRC, what is the shortest cycle you have had, and the longest?

    • In my 4 years:) I’ve seen cycles around 42 days and also around 60-62 days. In my opinion I think the pattern will fall within the 40-60 days most cycles. Maybe Scott can add his thoughts too.


  2. I have seen 35-75 day cycles. Mostly, it seems to be between 40-60.

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