Sunday, December 11, 2011

December 20 Snow Event (Midwest Affected) (Updated 12/11)

12z runs of both
There are very substantial differences between the GFS ENS (Ensembles) and the GFS at hour 216, supposedly when a winter storm is to affect the Midwest. The ensembles have been saying that a piece of energy will move NE from Texas and affect the Midwest and Ohio Valley as shown on the right. The GFS OP (Operational, the actual thing, not the ensembles) prefers to send this piece of energy along the Gulf coast and northward, bombing out into a coastal storm on the East Coast.
We are leaning towards the GFS ENS right now, because the actual models do not fare well during a pattern change, which is currently starting. That said, it is best to go towards the ensembles.
Some notes on other 12z models as they come in...

12z NOGAPS is very similar to 12z GFS OP at hour 144, likely takes path shown on left image at the top.

11 comments:

Mike Paulocsak said...

Hello Andrew.Could this bring Ohio heavy snowfall or not? I'm not too good at understanding these maps.Also,do you see any other winter storms towards the end of this month?

Andrew said...

If the right image verifies, your area would see snow out of this.
The right image are the ensembles, which are a good bet to go with, so your chances of snowfall are higher with the ensembles due to many members predicting an average 'yes' for snow.

Mike Paulocsak said...

Hello Andrew.Thanks for answering my question.I was just checking.Also,does the BOLD blue line mean anything north of it would be snow?

Andrew said...

Theoretically, yes.

Anonymous said...

Would detroit mi get snow

Gundeep said...

When will you guys bring back the model page?

Andrew said...

Anonymous: Possibly.
Gundeep: We are working tirelessly on it. It is a lot of hard work. However, we will bring it back tomorrow and still have some portions under construction. We have made major progress this weekend, though.

Gundeep said...

Can't wait to see the improvements!

AJ said...

Do you think a winter storm warning could be issued for Valparaiso Indiana?

AJ said...

IOs this still supposed to happen?

AJ said...

Is this still supposed to happen in Valparaiso,Indiana?