Weekend Storm…How Much Rain & Snow To Expect

***Watch WISN 12 News at 5, 6, & 10pm for the latest on the rain and snow this weekend!***

Thank you for stopping by the Weather Watch 12 blog!  If you are new to the blog welcome, and if you stop by each day welcome back!  Right now we are going to continue our discussion on the weekend storm for Southeast Wisconsin and what you can expect.

The storm that is headed our way brought inches of rain to the West and feet of snow in the mountains.  One record broken during this storm that really stood out to me occurred in Los Angeles on Thursday.  I mentioned this on our newscasts, but if you missed it here was the record that was broken.

AT 121 PM PST THURSDAY JANUARY 22ND…THE BAROMETRIC PRESSURE AT LOS
ANGELES INTERNATIONAL AIRPORT FELL TO 29.07 INCHES OF MERCURY…OR
980.0 MB. THIS BREAKS THE PREVIOUS RECORD LOWEST BAROMETRIC PRESSURE
READING OF 29.25 INCHES…OR 990.6 MB…SET ON JANUARY 17TH 1988.

PRESSURE DATA RECORDS AT LOS ANGELES AIRPORT DATE BACK TO 1931.

This shows just how strong this storm is that will head into the Midwest this weekend.  The big question for Southeast Wisconsin is, when does the rain begin, how much to expect, and when will it change to snow.  Those are the questions I will try to answer in this blog.  Just remember that new data is always flowing in to our forecast center, and for the very latest information tune in to our newscasts at 5, 6, & 10pm!  Also, on Saturday we will be tracking the rain on radar from 5-6am, 7-9am, and at 5, 6, & 10pm. 

Let’s start by looking at the how things will play out on Saturday.  We should wake up to dry conditions and cloudy skies.  Winds will increase to 15-25mph on Saturday, so expect a breezy day.  Temperatures will be in the 30s most of the day, but late it could touch 40 degrees.  Light rain or drizzle could move around midday, but be spotty.  That be possible in the afternoon too, before more light to moderate rain arrives late in the day and evening. 

Below is a forecast from the 12Z GFS for 6 p.m. on Saturday, notice the steadier rain to our west.  This should move in, and then we will watch the low pressure area over Oklahoma strengthen and head our way for Sunday. 

On Sunday there will be a period of steady rain before the colder air pushes into the region.  Any changeover to snow will likely hold off until mid-afternoon or later in some areas.  The snow does not look to be a huge part of the storm for Milwaukee.

To show what I mentioned above, one of our computer models still does not have all snow across Southeast Wisconsin by 6 p.m. on Sunday.  The green on the map is rain, and the blue is snow.  Even when the changeover to snow occurs, it looks like most of the precipitation would be done. 

By Sunday evening the total amount of precipitation will likely be around 0.50″ in Milwaukee give or take a couple of tenths on either side.  The map below is a forecast of the total precipitation from this storm.  This model is our high resolution in-house model.

As Mark often likes to say, ‘more wet than white’, looks to be a good way to describe this storm.  If you have travel plans this weekend do not cancel them.  Any snow that falls looks to be late in the weekend and minor.  Once this storm passes we will focus on the arctic chill that may return for the middle of the week!

Thank you for stopping by the weather blog, and make sure to watch our newscasts for the updates.

Jeremy Nelson

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