Coldest Temperatures Of The Winter

The coldest air of the winter is moving in. A wind chill advisory is in effect for all of SE Wisconsin through noon on Wednesday.

Temperatures will drop below zero tonight. From -4 in the city to -9 inland. Wind will stay brisk out of the west at 10-15 miles per hour. That combination will make it dangerously cold later tonight and Wednesday morning. Wednesday night will be even colder. Take a look at the RPM forecast for temperatures on Thursday morning.

Click on the above image to enlarge. Note the double-digit below zero temperatures away from Lake Michigan. Even though the temperatures will be colder, I don’t expect a wind chill advisory. The wind will be lighter on Wednesday night. The keys to radiational cooling, (nightime cooling) is clear skies, low dew points, and light winds. We will have all three on Wednesday night. Wind actually mixes the air and keeps the temperatures a little warmer than if you have calm winds.

If you are hoping for warmer weather, the weekend and next week should make you happy. Milder air will move in and much of the week will be in the 30s. More on that later this week.

In yesterday’s blog, I wrote about “ice balls.” Today I have a new slide show from Bradford Beach that includes another interesting picture. Go through the show and you can find the “ice volcano.” This is created when you have a large area of ice near the shore and strong onshore flow like we did in the blizzard last week. This pushes water under the ice and holes are created where the water splashes out. Sometimes explosively. The ice then builds up around the hole and creates a crater. If you are going to check these out along the beach please be careful. The ice is very unpredictable.

Thanks for reading.




4 Responses

  1. No luck on seeing the slide show…

    • Thanks, Scott.

      I think I fixed it. Let me know if you are still having trouble.


  2. Hi, Mark 🙂

    I now have our church signed up with WW12 for closing announcements. Thanks for your prompt response to our request to be included and for making the system SO EASY to use!

    Are you going to post the picture Toya said she was going to take of you going out to your car after 10 p.m. show? I’m thnking she was saying you didn’t wear a hat yesterday??

    My other comment/question today is this — Is it just me, or do you remembe when it used to snow during the day instead of at night? Of course I’m older than you — but I remember when I was a kid, we could watch it snow during the day. Now it seems most of our storms, especially the bigger ones, come in over night and are gone by the next morning. {Sometimes sever T-storms do this too}. Is there any scientific/meterological explanation for this ‘trend’ or am I way off base?

    Since the weather is ‘benign’ right now, thought I’d ask a general weather question today.

    Thanks, as always for the opportunity to ‘chat’ with you.

    Don in Reeseville

    PS: As of 10:00 a.m., our temp here is 1 below zero. I don’t have any way to measure winds, so can’t report on a ‘chill’ factor.

    • Hey, Don,

      Glad to help with the church announcement.

      The Toya comment was making fun of me never wearing a hat. I told her it was only to the car and back.

      As for the snow at night vs. day. Strictly happenstance. Thunderstorms are a different story. The greatest occurence of thunderstorms for us is between 3 and 9 pm. The heat of the day makes a big difference. Not so with snow.

      Hope this helps.

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