Good Tuesday, everybody. Improving weather is surging into the state today and will hang around for a few more. This means some fairly pleasant conditions through Thursday before we change it up. A major dip in the jet stream shows up on Friday, ushering in a much colder pattern that’s likely to bring some snow with it this weekend.

Skies clean up today with a mix of sun and clouds boosting temps into the 40-45 degree range, which is normal for this time of year.

Those numbers reach deeper into the 40s for Wednesday and Thursday as we continue with the sun and clouds thing going on. Winds will be a little gusty as well.

Those winds will really gust up on Friday as a strong cold front works in from the northwest. This is being pushed by this major dip in the jet stream…

As our cold front moves in, it has a band of rain and snow with it into early Friday. The NAM only goes through 7am Friday, but picks up on this well…

This will then be followed by an upper level system working in here on Saturday, bringing periods of light snow and a good possibility to put some snow on the ground…

GFS

Canadian

That will be followed up by another system early next week, but the models continue to bounce around with it…

All of this kicks off the much colder than normal pattern that will likely feature several snow threats.

If we take a look at the various indices or teleconnections, we find a notable change showing up and it’s a change strengthening the argument for winter weather.

The NAO and AO continue to be negative and are forecast to stay that way over the next two weeks…

NAO

AO

The one factor that’s kept the above two negative modes from flexing has been a positive Eastern Pacific Oscillation index. This has been throwing some Pacific air into the country, keeping these troughs from being able to turn cold by January standards. The EPO is set to undergo a major reversal and flip to negative…

That will help ensure a tanking temperature pattern during the second half of the month, at least.

Given the PNA going negative, this may turn into a rare coast to coast cold setup…

I will have updates later today. Have a good one and take care.