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New Years Winter Storm


Chicago Storm
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7 minutes ago, Hoosier said:

I could argue 6-10", highest near the lake.  I could, but I decline at this time

Plumes have a Mean qpf of 0.75 at ORD.  But has some of that falling as a mix or rain which brings down the snow total mean.  If it stays all snow I would agree 6-10 possible with the higher ratio snow falling at backside.

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Im back in MI for the next few weeks.

One thing I am a bit confused on is GRR, they say they arent going to issue a WSWatch because the totals look under warning criteria.

But they also say 4-6", shouldn't they still issue a watch to get the public on notice?

 

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Our focus then is then on the snow event from Saturday (New Year`s
Day) afternoon through Saturday night. This system is looking a bit
less impressive for our area, as compared to the last couple of days
with regards to snow amounts. There is good model/ensemble consensus
at this time that a good chunk of the area will see 3 to 6 inches of
snow, with maybe the northern third of the area seeing less amounts.
That said, we are thinking this looks to be a solid advisory event
at this time.

We feel good with those amounts at this time given the expected
interaction of the various ingredients/dynamics. One thing that
leads us to believe that this will not be a heavy snow event is that
the mid/upper level system is not closed off as it moves through our
area. There is some decent jet lift for a couple of time periods.
However, the first jet lift event early Sat, a RRQ of a departing
jet streak will be when we don`t have the coldest of air in place
yet, and moisture is not real deep.

The snow will start Saturday afternoon as we get the warm air aloft
overrunning the increasing colder air at the sfc. The best snow
looks to move in prior to 00z Sun, and then depart by 06z Sun. This
is the result of a stronger bout of mid level fgen near the 850 mb
low that moves by just to our south fairly quickly. We could see
some decent snow rates, but they will be relatively short in
duration. Some snow will then linger until just after sunrise on
Sunday when the upper trough axis pushes through.

Another factor that gives us confidence in solid advisory snowfall,
is that mid level mixing rates over much of the area are 2-3 g/kg
during the heart of the event would support 4-6 inches via the
Garcia method.

Another factor to mention here is that lake enhancement will not be
a factor on this side of the lake with an offshore NE flow.

If models were to trend up with amounts in the next 12 hours
(stronger forcing), a Winter Storm Watch may be needed. However at
this time, we anticipate that an advisory would be most appropriate
as we get closer to the event. Thank you for the collaboration
regarding this IWX and DTX.

 

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2 minutes ago, hlcater said:

Think I'm probably going to throw in the towel for a 6" snow for CR. Thinking the max band ends up somwhere near washington, IA through evanston or so.

 

Gonna go with a first call of 4"

Worse if the snow misses CR entirely like it did on 11/25/18.  Doubtful that will happen I wouldn't be surprised if we only got 4-5 inches from this.

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Just now, Natester said:

Worse if the snow misses CR entirely like it did on 11/25/18.  Doubtful that will happen I wouldn't be surprised if we only got 4-5 inches from this.

That won't happen. I think our clearest avenue to 6" is more QPF with the system in general (ie stronger/wider band of snowfall) rather than a track shift. There is a very strong consensus on a SE IA thru Chicago track.

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