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December 8-16 Clipper Regime


Hoosier

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4 minutes ago, blackrock said:

Our local met said at the end of his forecast tonight: "This weekend looks like quite a mess. Our models are at odds with each other. Some say rain/snow mix and other show a 'whopper' of a storm."

 

Yeah the Euro shows our first nearly full sub-forum significant synoptic snow of the season for Sunday. GFS is warm - would be 30’s and heavy rain, so really hope that solution doesn’t verify. 

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4 minutes ago, Harry Perry said:

Yeah the Euro shows our first nearly full sub-forum significant synoptic snow of the season for Sunday. GFS is warm - would be 30’s and heavy rain, so really hope that solution doesn’t verify. 

GRR NWS mentioned in their discussion that they were leaning towards the Euro. The GFS has been flip flopping back and forth...per usual. The longer range pattern is certainly looking more exciting and active than just a day or two ago!

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1 hour ago, Harry Perry said:

Yeah the Euro shows our first nearly full sub-forum significant synoptic snow of the season for Sunday. GFS is warm - would be 30’s and heavy rain, so really hope that solution doesn’t verify. 

Well, don't put a lot of hopes on this too far out, but the Euro snow (10:1 ratio) shows about 7" -9" for southern Michigan counties on Sunday-Monday. It's nice to know that I could actually post the image for that. I don't want to clutter this thread though. The Euro Ensemble means have 850mb temps right near freezing near Chicago and Detroit for Sunday-Monday. So, definitely something to watch in the next three days. Meanwhile more predictable clipper snow will roll through. (4" for Toledo seems like a fair guess.)

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21 minutes ago, mimillman said:

I think this event stands to produce decent lake effect for the western shore of Lake Michigan. Nothing crazy, but certainly some accumulation. ECMWF was the first to pick up that signal. GFS and NAM followed suite today.

I agree... enhancement transitioning to pure lake effect.  Parameters look decent and should allow for some accumulation even if transient.  

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I agree... enhancement transitioning to pure lake effect.  Parameters look decent and should allow for some accumulation even if transient.  

The trend has been for a more amped system and northeast track of the surface low (FWIW exception of extended range of 00z HRRR-x which is farther south). Should current trends come to fruition, the system snow would largely miss northern IL and NW IN. On the other hand, a stronger surface low would be more favorable for a solid albeit probably transient lake effect band starting in IL and then pivoting to NW IN Wednesday night. Parameters look quite favorable and full north-northeast fetch down the lake from 850 down to the surface means it could rip under the band.

Sent from my SM-G935V using Tapatalk

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NWS Detroit considering a Winter Storm watch for tomorrow. Perhaps a winter storm watch or advisory necessary for Cleveland, NW Ohio, central Ohio and Grand Rapids.

NDFD snow plot (54 hours)

S7zKnyF.png

Part of NWS Detroit discussion (December 12)

Quote

The afternoon package will contain significant forecast changes for
Wednesday. 00z trends continued through 06z and an improving
conensus has emerged in today`s 12z guidance. Confidence is further
improved by the fact that minor variations in wave interactions
amongst the different guidance is resulting in relatively little
change in the surface reflection as forcing remains tied to the much
stronger northern wave. Several inches of snow is expected over most
or all of the area beginning midday Wednesday and lasting into
Wednesday night. 3 to 5 inches for all locations except the Thumb is
expected. A very healthy fgen band will bring potential for 6 inches
or more. The potential placement of this band is expected to be
somewhere between M-59 and the MI border with IN/OH. A winter storm
watch will be given strong consideration with the 4pm forecast
issuance. Finally - LES wrapping in on the back side of the low will
give potential for a few additional inches in portions of the Thumb
making up for what is expected to be lighter daytime accumulations. A
winter storm watch will likely be issued this afternoon.

 

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